Spectra Logic Network Card TAC COM SERIES User Manual

SM06

TAC/COM SERIES

Control Head

INSTALLATION AND OPERATION MANUAL

REV 4.10 January 4, 2006

Northern Airborne Technology Ltd.

1925 Kirschner Road

Kelowna, BC, Canada.

V1Y 4N7

Telephone (250) 763-2232

Facsimile (250) 762-3374

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SM06 Rev. 4.10

Tac/Com Control Head Manual

Table of Contents

Section

Title

Page

Description

1.1

1.2

Introduction

General

1-1

1.2.1

1.2.2

1.3

Tac/Com Control Head Family

Accessories

Purpose of Equipment

1-2

1-3

1-5

1.3.1

1.3.2

1.3.3

1.3.4

1.3.5

1.4

1.4.1

1.4.2

1.5

1.5.1

1.5.2

1.5.3

1.6

1.6.1

1.6.2

1.6.3

1.6.4

1.6.5

Interface Considerations

Mixed Transceiver System

Radio Capability Increase With Tac/Com

Master/Slave Configuration

Frequency Data Considerations

Hardware Design Features & Considerations

General

Display Filtering/Lighting Options

Specifications

Electrical Specifications

Physical Specifications

Environmental Specifications

Unit Nomenclature

1-6

1-7

1-8

1-9

1-10

1-11

1-12

1-13

1-14

1-15

Series Designation

Number Of Radios

Display Type

Display Filter/Lighting Suffix Information

Interface-Specific Suffix Information

Installation

2.1

2.2

2.2.1

2.3

2.3.1

2.3.2

2.3.3

2.3.4

2.3.5

2.4

Introduction

Unpacking and Inspection

Warranty

Installation Procedures

Warnings

2-1

2-2

2-3

2-4

Cautions

Cabling and Wiring

Mechanical Mounting

Notes

Post Installation Checks

Voltage/Resistance Checks

Power On Checks

2.4.1

2.4.2

Jan 4, 2006

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SM06 Rev. 4.10

Tac/Com Control Head Manual

Section

Title

Page

2.5

Troubleshooting

Weak Receive/Transmit, Intermittent Operation, Erratic Squelch

2-6

2.5.1

2.5.2

2.5.3

2.5.4

2.5.5

2.6

2.7

2.8

2.8.1

2.8.2

2-6

2-7

2-8

Strange Noises, No Receive Audio, Transmit Keying problems

Some Frequencies Can't be Edited

Display Brightness is Too Low, Can't Increase to Full Brightness

Amber (RX) Squelch light comes on, but no RX audio is heard.

Final Inspection

Continued Airworthiness

Installation Drawings

Outline drawings

System Connector (J-100)

Operation

3.1

3.2

Introduction

General

3-1

3.3

Initial Operation

3-2

3.3.1

3.3.2

3.4

Power-up Help

Initial Operating Display

Front Panel Controls

3-2

3--2

3-3

3.4.1

3.4.2

3.5

3.5.1

3.5.2

3.5.3

3.5.4

3.6

3.6.1

3.6.2

3.7

3.7.1

3.7.2

3.7.3

3.8

Radio Specific Controls

General Controls - NORMAL Operation

Editing

3-4

3-6

3-10

3-11

3-14

3-15

3-16

3-19

3-20

3-21

3-23

3-24

3-25

3-27

3-28

3-29

3-30

3-31

3-32

Channel Editing

Summary of Channel Editing

Summary of Channel Labels

Summary of Subaudible Tones

Status Line Editing

NEXT and SELECT Switch Use

Status Edit Features

Channel Display Summary

Display Switch Set to 'ID'

Display Switch Set to 'RX'

Display Switch Set to 'TX'

Changing Display Brightness

Scanning

Scan Modes

NAT NTX138 Wide-band/Narrow-band Operation

Master Edit Mode

Entering Master Edit Mode

How Data is Stored in the Control Head

Editing Considerations

Installation & Configuration Mode

Entering Configuration Mode

Configuration Option Table

3.9

3.9.1

3.10

3.11

3.11.1

3.11.2

3.11.3

3.12

3.12.1

3.12.2

Jan 4, 2006

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SM06 Rev. 4.10

Tac/Com Control Head Manual

Section 1 Description

1.1

Introduction

This manual contains information on the NAT Tac/Com control heads. All derivative

products and interface cards will be covered by manual supplements, which can be

obtained from NAT as required.

Information in this section consists of purpose of equipment, features and specifications.

1.2

General

The Tac/Com control head provides exceptional flexibility and ease of operation while

using minimal panel space. In a Dzus panel height of only 4⅞ inches, up to four

transceiver systems can be controlled and accessed using a Tac/Com control head.

The controlled radio systems may be either NAT transceivers or combinations of

different manufacturer's transceivers.

Tac/Com controls are available in two basic families: Tac/Com I (both LED and LCD

displays), and Tac/Com II (LED only). Note that the Tac/Com I or ‘CH ‘ series control

heads have been discontinued since 1995. Tac/Com II control head variations include

2-, 3- or 4-transceiver support, master or slave versions and custom panel lighting, and

support expanded channel storage (up to 128 channels per radio), remote channel

selection, display auto-dimming, and full software configuration of the control head.

Features

Control/Display 2 & 4 Radio LCD,

Types 2 & 4 Radio LED

Channels/Radio 32 (NT) or 56 (non-scanning)

Tac/Com I

Tac/Com II

2, 3 & 4 Radio LED.

128 maximum.

Special

Features

HELP, Alphanumeric

Labelling of Channels

HELP, Alphanumeric

Labelling of Channels, High-

speed Scrolling, Remote

Radio/Channel Selection,

Auto Night Dimming.

Master/Slave

Yes

DTE12 Support No

USFS Guard &

Tone Capability

NT136-PAS

Compatible

Yes

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Tac/Com Control Head Manual

SM06 Rev. 4.10

The Tac/Com control head carries its own operator's manual in internal software, and

can provide on-line help to the operator for all functions. An initial help mode at power-

up can provide a complete tutorial of the control head and its operating and storage

functions, and pressing the HELP button during either EDIT operation brings up

context-sensitive help for the specific storage or data entry function being carried out.

This provides a simple way for new staff to train, as well as providing a private method

to refresh their knowledge of the system whenever they chose. The help information

‘manual’ can never be lost or misplaced because it forms part of the basic control head

itself.

Radio control functions and transceiver interfaces are determined by a combination of

Tac/Com control head software and internal radio-specific interface cards. To specify a

complete control head, you must select the basic size format and the internal interfaces.

The range of control heads is shown graphically in the Tac/Com control head family

drawing below.

1.2.1

Tac/Com Control Head Family

Each control head type can have user-specified interfaces installed as required. Control

heads with LCD displays are no longer available (available as Tac/Com I only). Current

models are available with LED displays (Tac/Com II).

Two-Radio Control Heads

Three-Radio Control Heads

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SM06 Rev. 4.10

Tac/Com Control Head Manual

Four-Radio Control Heads

1.2.2

Accessories

The Tac/Com family encompasses numerous specialized accessories to extend system

capability, as well as transceivers and the control heads reviewed in this manual.

NAT transceiver capabilities are covered in separate manuals. For reference, the

additional system components include:

1.2.2.1

Remote Mount VHF FM Transceivers

*NT030A-xxx

Low Band

High Band

Mid Band

*NT030B-xxx

*NT136-xxx

*NT150-xxx

NTX066-xxx

NTX138-xxx

High Band/Narrow Band Compatible, available with USFS

Custom Guard option

NTX138E-100

High Band/Direction Finding (DF) Capability/Enhanced

environmental specifications

1.2.2.2

Remote Mount UHF FM Transceivers

*NT403-xxx

*NT450-xxx

*NT450x-xxx

*NT806-000

NTX403-xxx

Low Band

High Band

800 MHz

Low/High Band

* No longer available as new products.

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Tac/Com Control Head Manual

SM06 Rev. 4.10

1.2.2.3 TE12/DTE12/DP12 DTMF Tone Generator/Keyboard Data Entry Unit

These devices can output DTMF signalling tones from either keyboard control or stored

sequences, and can serve as a direct keyboard data entry system for Tac/Com control

heads to change channels and frequencies. Consult NAT Ltd. for further information.

1.2.2.4

RA10 Remote Attenuator

This group of remote signal attenuators can be used to alter receive and transmit

performance and range under operator control. They allow compliance with restricted

transmit power regulations even when the radio itself cannot alter its transmit level.

They are used extensively in Europe for changing TX power to even lower levels than

the 1W output possible via Tac/Com transceivers directly, and to reduce RX

interference from closely spaced repeaters by reducing RX sensitivity.

1.2.2.5

Tactical Direction Finding (TDF) System

This 2-axis DF system allows both left-right and fore-aft sensing with a pictorial display.

This provides exceptional accuracy during search and rescue and remote tracking

operations, and also provides a positive indication of station passage (impossible with

single axis systems) to aid in exact target location.

1.2.2.6

CC250/450 Communications Controllers

The CC250/450 is a compact, easy to install communications controller. It is designed

to provide relay and/or simulcast operation for up to 4 transceivers. With these

functions, the aircraft can become an airborne repeater or a multi-frequency transmitting

platform. When used to its potential, the CC250/450 provides increased efficiency and

reduced workload for communication operations. Only the CC450-0V2 is currently in

production.

1.2.2.7

CTE12 Calquest Headset Adapter

The CTE12-100 Calquest Headset Adapter is designed to interface standard avionics

headsets to the Calquest Cabin Network Unit (CNU). The headset adapter provides a

DTMF keypad, status indicators, ring chime control, ring/in-use annunciator control and

VOX squelch capability. The headset adapter can interface directly to a headset or a

standard avionics audio panel.

1.2.2.8

UT12 Universal Tone Encoder/Decoder

The UT12-000 is capable of encoding and decoding 5-tone CCIR tone sequences and

DTMF tones. It is compatible with the NAT Tac/Com system, and when used in

conjunction with a TH-series Tac/Com control head provides broader and easier control

over tones. The control head or transceiver can select, enable, disable and display

tones by communicating with the UT12-000 through a serial port.

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SM06 Rev. 4.10

1.3 Purpose of Equipment

Tac/Com Control Head Manual

The Tac/Com series of control heads provides a centralized location for tactical radio

control and channelling of up to four independent transceiver systems. Only the

Tac/Com II series will be considered; for further information, contact NAT Ltd.

Alphanumeric labeling of each radio channel is provided, as well as a display of receive

and transmit frequencies, to ease pilot identification of the selected channel on each

radio.

At the Tac/Com (master) control head, individual radio receive volume and radio power

on/off status can be controlled. Individual radio functions can also be set, such as

scanning, tones, simplex/duplex, TX power and others. Annunciation is provided for TX

and RX activity on a per transceiver basis, and the main display can be set to show the

channel name (alphabetic label), the receive frequency and tone data, or the transmit

frequency and tone data for all radios via the general control group.

Radio

Controls

General

Controls

TH250 Control

(2 Radios, 256 Total Channels)

Within the control head, individual radio interface cards translate the control head

commands into suitable channelling data for each specific type of radio connected.

Software controlling these functions, as well as the built-in help screens for control head

operation, is located on the main control head CPU board and can be easily replaced to

upgrade or improve control head functions.

The software of the control head's computer can emulate many types of parallel tuned

radio controls and this allows the Tac/Com system to directly replace many existing

controls such as the C-960, C-961, C-962A, C-722A and C-1000. In addition, since the

Tac/Com control allows control of up to four simultaneous radio systems, the single

Tac/Com control can replace up to four individual controls, with a substantial reduction

in cost and panel space. The following diagram illustrates a system that shows this

multiple radio capability using NAT NT-series agile transceivers. Any combination of

radios could be used by installation of the appropriate interface cards within the control

head. In the example below, an accessory DTE12 is used for DTMF tone generation

and direct keyboard data input to the TH450.

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1.3.1 Interface Considerations

SM06 Rev. 4.10

Tac/Com offers direct plug compatibility for replacement of C-962/A and C-722/A control

heads (for use with the RT-9600 and RT-7200), including the second audio connector.

For USFS applications, Tac/Com provides some additional capability when used with the

RT-9600. Full guard receiver control can be brought out on the front panel, and the

limited tone capability of the RT-9600 (8 variable tones) can be replaced with the internal

tone capability of the Tac/Com ‘U’ interface, which provides all 32 standard CTCSS tones.

This interface remains plug-compatible, and also eliminates the awkward external tone

encoder required on USFS contracts. A USFS-compatible ‘V’ interface is provided for

use with NT150-050 guard-equipped radios, and the 'H' interface is designed for use with

the NTX138-050.

For use with existing Flexcomm installations, NAT provides an adapter cable (p/n

FC41-000 Flexcable) that permits direct connection from C-1000 airframe connectors

to the ‘F’ interface.

1.3.2

Mixed Transceiver System

The example shows a four radio Tac/Com control head running a mixed transceiver

group, to illustrate what is possible with the interface flexibility of Tac/Com internal

architecture. Transceivers may be a combination of fixed and agile radios, with and

without scanning, and can be from any of the supported interfaces that NAT provides.

See section 1.6.5 or consult Product Support at NAT for further information.

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SM06 Rev. 4.10

1.3.3 Radio Capability Increase With Tac/Com

Tac/Com Control Head Manual

Wherever possible, NAT has increased the capability of other transceivers via the

Tac/Com control head, and those features are summarized below, compared to the

original controls:

Feature

Tac/Com I

32/56 per Radio

38 + 83 DPL

Tac/Com II

C1000

C962/722

15 Total

Stored Channels

PL Tones*

128 per Radio

30 Total

38 + 83 DPL

32 for W.E.D.

No. of Transceivers

1 - 4

(simultaneous)

Alpha Labels

Yes

Remote Selection

(channels & radio)

Master/Slave

Yes

(both active)

*NAT NT-series Radios have the capability shown. Tac/Com controls can provide 32

PL tones for Flexcomm. Tac/Com II can also provide an internal tone upgrade for the

RT-9600/7200 to provide all 32 standard EIA CTCSS tones (‘U’ interface).

PL = Private Line (also known as CTCSS)

DPL = Digital Private Line

W.E.D. = Wulfsberg Electronics Division

Note: Only NAT's own NT-series transceivers support all the features provided by

Tac/Com controls. Tac/Com controls cannot give a radio functions of which it is

inherently incapable. For example, older crystal-controlled Flitefone 40's do not

become agile radios when connected to a Tac/Com head, and Flexcomm radios

do not acquire high speed scanning or DPL capability.

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Tac/Com Control Head Manual

1.3.4 Master/Slave Configuration

SM06 Rev. 4.10

One powerful configuration that NAT's Tac/Com controls support is the master/slave

configuration. In this configuration, two controls can be active at the same time (flight

crew and medical crew, for example), and both can select channels and radios. The

extraordinary aspect of this interface is the fact that this interconnect requires only 6

additional wires to give full support to both stations. Dual controls wired with other units

often require hundreds of wires, and still permit only a single control to be active at one

time.

A typical master/slave interconnect is illustrated below for clarification. Many

variations are possible, and the controls can be 2, 3 or 4 radio types, if required.

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SM06 Rev. 4.10

1.3.5 Frequency Data Considerations

Tac/Com Control Head Manual

Tac/Com controls have an intelligent editor that prevents incorrect data entry when

programming frequencies for a given agile radio. VHF radios can receive only valid

VHF frequencies; UHF radios only UHF frequencies at the correct intervals, and so on.

This greatly eases operator use, and prevents many common pilot errors. The C-1000

permits many types of incorrect entries for radios because of its thumbwheel entry

system. This intelligent editor is especially useful when the Tac/Com control head has

been set to emulate a C-1000 (i.e., channel any Flexcomm radio), as it detects the

range of the radio as the data is being entered, and then restricts subsequent

information to correspond to the exact radio type.

Radios in each band-split have specific channel interval assignments (by law), and are

typically on 25 kHz, 15 kHz, 12.5 kHz, 6.25 kHz, 5 kHz or 2.5 kHz intervals. Which

multiples are possible depends on the design of the radio's synthesizer circuitry, history

and restrictions of the country of operation. Tac/Com automatically picks the correct

multiples for each radio type based on the stored installation data, and ensures that only

valid choices are possible for the operator.

If the operator enters invalid data via either external data entry or other procedure, the

control will advise of this error. User intervention is then required to correct the data

before proper radio operation can be achieved.

1.3.5.1

Frequency Programming

There are three ways to program channel data into a Tac/Com control head:

From the front panel controls (edit mode).

From a DTE12 Keyboard/Data Unit (edit mode, Tac/Com II only).

From a PC via NAT's data loading software & the system serial port.

1.3.5.2

Channel Selection

There are three ways to select a channel on a Tac/Com control head:

From the front panel controls.

From the remote select switches (Tac/Com II only).

From a DTE12 Keyboard/Data Unit (Tac/Com II only).

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SM06 Rev. 4.10

1.4

Hardware Design Features & Considerations

General

1.4.1

The Dzus mounted Tac/Com control heads use extremely high quality components,

including sealed gold contact switches, gold contact connectors and fully masked,

conformal-coated FR4 flame retardant circuit boards. Each unit is fully temperature

cycled, life-tested, and then supported with a solid one-year warranty and extensive

field support to ensure the best possible customer satisfaction.

A wide range energy conversion power supply is used in the control head, allowing

operation from 16-33 Vdc, for nominal 28 Vdc systems. Panel lighting must be adjusted

to suit the specific application, and is normally supplied as natural colouration 28 Vdc

incandescent lighting. Options include blue/white or NVG lighting available in +5, +14

or +28 operating voltages.

For ease of service, integrated circuits are socketed where possible, allowing fast return

to service of failed control heads and quicker bench troubleshooting. Control head

software is easily updated for improved features or expanded capability by an internal

EPROM exchange. Internal interface cards are plug-in modules to facilitate quick

service exchange or upgrade.

Wherever possible, fully plug-compatible interconnects are provided for existing systems

replaced by Tac/Com controls, making retrofits and test flights both easy to accomplish

and inexpensive. Where it is not possible to directly accomplish this within the control

head itself, an adapter cable or plug replacement on an existing cable is used.

1.4.2

Display Filtering/Lighting Options

Current LED displays used in Tac/Com II control heads are green (first generation

Tac/Com I controls used a yellow display), with fully formed 5x7-pixel alphanumeric

characters. They have a large character height of 5 mm/0.2" and a very wide viewing

angle (>150 degrees) that provides good readability from virtually all cabin mounting

locations, including centre consoles such as in the Bell 412/212.

Several display filter/panel lighting options are provided with LED controls to give the

best visual presentation in different ambient lighting conditions. ‘Filter’ refers to the

DISPLAY colour and appearance and ‘Panel Lighting’ refers to the panel legend back

lighting colour & voltage.

See Section 1.6 Unit Nomenclature for complete option list details.

The backlighting for the control head (which includes the LCD display) can be run from a

dimmer separate from other cockpit controls if more adjustment over the LCD back lighting is

desired. This will permit both backlighting and contrast to be adjusted for the best presentation.

The LED display automatically dims (on current production units) to 50% intensity when voltage

is detected on the control head light bus. The LED display is adjustable in 7 steps via the

SELECT (+/-) switch, when the Bright +/Dim - screen is displayed.

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Tac/Com Control Head Manual

1.5

Specifications

Electrical Specifications

16-33 Vdc.

1.5.1

Input Power:

Current:

0.25 A/LED Control 250 Series

0.35 A/LED Control 350 Series

0.45 A/LED Control 450 Series

0.15 A/LCD Control 400 Series

+0.075 A/Interface Card Installed (for all types)

+0.250 A/28 Vdc for panel lighting

Values above are maximum, display set to full intensity.

Panel Indicators:

Channel Storage:

Two-colour LED indicates: TX - Green

RX (SQ) - Orange

One LED per radio, except when the interface

supports separate guard controls (‘U’, ‘V’, etc.), in

which case a second LED is provided for the guard

receiver.

CH-series (Tac/Com I)

TH series (Tac/Com II)

32/56 Channels per radio

128 Channels per radio

Data Interface:

Scanning:

Programming via standard RS-232 from a PC (NAT

software), or front panel for all functions.

NT -series transceivers: 90 channels/second/radio.

NTX -series transceivers: 10-20 channels/second/radio.

Modes are LIST, PRIORITY, LIST + PRIORITY.

Priority monitoring is 3 times/second for 10-15 ms sample.

Radio will re-channel to the priority channel if traffic is

detected, and returns to the monitor channel after a 2

second latency.

All CTCSS tones or DPL codes are inactive during

scanning (due to lock delay).

Other scanning parameters depend on the radio type.

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Tac/Com Control Head Manual

SM06 Rev. 4.10

1.5.2

Physical Specifications

Height

Tac/Com Series

250/260 and 350/360

450A

Rail Height Required

3.00”

3.75”

450B and 460B

450/460

3.375”

4.875”

Length

Width

6.27 inches (159.3 mm) excluding connector

5.8 inches (146.1 mm)

Weight

Mounting

2.2 to 2.9 lbs (1 kg to 1.3 kg) depending on model

Horizontal through-panel Dzus mount.

Fits standard opening (5" clearance/5.75" panel width)

Requires 3" of rail height (450 series require 4.875")

Front Panel Controls:

Radio Volume/Power ON-OFF

One or two radio-specific controls

Display Contrast (LCD)

Display Mode (ID/RX/TX)

Channel/Select (+/-)

Radio/Next

Edit Switch (Channel-Off-Status)

Squelch/Help

Internal Controls:

Agile Channel Defeat/Enable (on interface cards)

Lamp Dimmer Voltage (Panel Overlay)

Squelch, Tone & Level Preset where applicable

Tac/Com I Only, pre-s/n 1129:

NAT R/T Band Select

RT-9600/7200 Mode Select

Flexcomm Band Select

Overall form factor matches C-722A/C-962A/C-1000

QA/Manufacturing Processes:

TC AWM PART 561

MIL-STD-2000 (MU) Assembly

ISO9001-1994

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SM06 Rev. 4.10

Tac/Com Control Head Manual

1.5.3

Environmental Specifications

Pressurized alt. equivalent to 15,000'

Altitude:

Unpressurized alt. equivalent to 35,000'

Temperature:

-20º C to +60º C Operating

-55º C to +85º C Survival

Humidity:

Vibration:

90% @ +60º C

DO-160 category K/P/S, console or panel mounting in

both helicopters or fixed-wing. All Dzus fasteners

MUST be secured.

1.6

Unit Nomenclature

Tac/Com control heads are identified by two groups of numbers. The first defines the

general capability of the control head in terms of the total number of radios controlled

and type of display, and the second specifically defines the display filter and backlight

type, as well as the radio types supported. Each section of the part number defines part

of the control head capability.

General Capability

Specific Interfaces

TH450 - 2NNFE

Display Filter Information

Series Designation

1.6.1

1.6.2

TH450 - 2NNFE

CH = Tac/Com I Series Controls

TH = Tac/Com II Series Controls

Above example: Tac/Com II

Number Of Radios

TH250 - 2NN

2 = Two Radio Control

3 = Three Radio Control

4 = Four Radio Control

Above example: 2 Radio

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SM06 Rev. 4.10

1.6.3

Display Type

TH450 - 2FFNN

00 = LCD Display, Master (Discontinued)

10 = LCD Display, Slave (Discontinued)

50 = LED Display, Master

60 = LED Display, Slave

Above example: LED Master

1.6.4

Display Filter/Lighting Suffix Information

TH260 - 2ZZ

0 = Yellow/Green LED Filter, or Clear LCD Filter, Natural 28 Vdc lighting.

(LCD Standard)

1 = Dark Green LED Filter, NVG-friendly LED 28 Vdc lighting

2 = Dark Green LED Filter, Natural 28 Vdc lighting. (LED Standard)

3 = Yellow/Green LED Filter w/Z-cloth, Natural 28 Vdc lighting

4 = Dark Green LED Filter, Natural 5 Vdc lighting

5 = Dark Green LED Filter, NVG-friendly LED 5 Vdc lighting

6 = Dark Green LED Filter, Blue/White 28 Vdc lighting

7 = Circular Polarized glass, daylight, Natural 28 Vdc lighting

8 = Circular Polarized glass, daylight, Blue/White 5 Vdc lighting

9 = Deep Red Filter with Red LED Displays, Natural 28 Vdc lighting

10 = Yellow/Green with Amber LED Displays, Natural 28 Vdc lighting

11 = Circular Polarized glass, daylight, NVG-friendly LED 5 Vdc lighting

12 = Circular Polarized glass, daylight, NVG-friendly LED 28 Vdc lighting

13 = Circular Polarized glass, Natural 5 Vdc lighting

14 = Dark Green LED Filter, Blue/White 5 Vdc lighting

15 = Circular Polarized glass, daylight, Blue/White 28 Vdc lighting

16 = Circular Polarized glass, daylight, NVIS B Compliant 28 Vdc lighting

17 = Circular Polarized glass, daylight, NVIS B Compliant 5 Vdc lighting

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1.6.5 Interface-Specific Suffix Information

Tac/Com Control Head Manual

The position of the digit in the code reflects the position of the card in the control. The

code position from left to right equals the relevant card position from top to bottom.

TH450 - 2NNNE

A = ARINC 2 of 5 Comm

B = Blank (No Controls)

C = Flitefone 40

M = Midland Syn-Tech I

N = NAT NT-Series

O = Not Assigned

D = Motorola Astro/XTL Series

P = RT9600/7200 Single Connector

D1 = Motorola Astro/XTL with zone function Q = RT9600 with Tones, No Guard

E = NT Slot. Controls only. No Card

F = Flexcomm

R = RT9600/7200 Plug Compatible

S = Motorola URC-200

G = Flex Slot. Controls only. No Card

H = NTX Series with USFS Guard

I = Not Assigned

T = NAT NT-Series with Transcrypt

U = RT9600 with USFS Guard & Internal

32 Tones

J = NAT Tac/Com NTX Series

J1 = Chelton 805-1, 905-2, 915-1

K = Midland Syn-Tech XTR

L = Motorola Spectra

V = NAT NT-Series with USFS Guard

W = Not Assigned

X = Not Assigned

Y = Serial I/O Expansion Port

L1 = Motorola Spectra with zone function Z = General Slave Interface

Above example: 3 NAT & 1 Empty (Empty in bottom slot)

Earlier Tac/Com I controls had a different numbering scheme, using only a three

character suffix. If you need to convert an older number to a new one, contact NAT

for details, or consult revision 1.xx of this manual.

End of section 1

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Section 2 Installation

2.1

Introduction

Information in this section consists of: unpacking and inspection procedures, installation

procedures, post-installation checks, and installation drawings.

2.2

Unpacking and Inspection

Unpack the equipment carefully and locate the warranty card. Inspect the unit visually

for damage due to shipping and report all such claims immediately to the carrier

involved. Note that each unit should have the following:

- Tac/Com Control Head

- Warranty Card

- Operator’s Manual

- Release certification

Verify that all items are present before proceeding and report any shortage immediately

to your supplier.

2.2.1

Warranty

Complete the warranty card information and send it to NAT when the installation is

complete. If you fail to complete the warranty card, the warranty will be activated on

date of shipment from NAT.

Note: An appropriately rated facility, e.g. Certified Aircraft Repair Station, must install this

equipment in accordance with applicable regulations. NAT Ltd’s warranty is not

valid unless the equipment is installed by an authorized NAT Dealer. Failure to

follow any of the installation instructions, or installation by a non-certified individual

or agency will void the warranty, and may result in a non-airworthy installation.

2.3

Installation Procedures

Warnings

2.3.1

Do not bundle any lines from this unit with transmitter coax lines. Do not bundle any

lines from this unit with 400 Hz synchro wiring, or AC power lines. Failure to observe

these limitations may result in incorrect or intermittent operation, or severe audio

interference on received and transmitted signals.

In all installations, use shielded cable exactly as shown, and ground as indicated.

Significant noise problems and/or improper operation may result from not following

these guidelines.

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2.3.2 Cautions

SM06 Rev. 4.10

All audio installations can be severely degraded by incorrect wiring and shielding, and

may result in much higher cross-talk, hum, and ground-loop interference. This should

be considered when installing audio wiring to and from the specific radio. Both the

audio Hi and Lo wires must be connected from the radios (audio outputs are floating

transformer windings on NT-series radios), and should be grounded only at the audio

panel via the audio common.

If multiple transceivers are installed, it is very beneficial to use tri-axial cable for the

antenna feedlines, with the outer shield grounded at the radio end only. This added

electro-static shielding greatly reduces cable coupling, and eliminates many types of

interference in the final installation. Observe proper antenna spacing and good routing

practice for all RF lines to avoid cross-talk, squelch interference, and phantom sidetone

problems.

2.3.3

Cabling and Wiring

All unshielded wire shall be selected in accordance with AC43.13-1B Change 1,

Paragraphs 11-76 through 11-78. Wire types should be to MIL-W-22759 as specified in

AC43.13-1B Change 1, Paragraphs 11-85, 11-86, and listed in Table 11-11. For

shielded wire applications, use Tefzel MIL-C-27500 shielded wire with solder sleeves

(for shield terminations) to make the most compact and easily terminated interconnect.

Follow the wiring diagrams in Section 2.9 as required.

Installation cabling must allow the unit to be easily withdrawn for disconnection, switch

and pot settings (internal), and removal. Ensure an adequate service loop is allowed in

the routing of the cable. This can become a serious problem if the unit is installed with

the cables so short that the unit cannot be removed without disassembly of the

mounting console. At least 1 foot (30 cm) of free cable is recommended.

Allow 3 inches (8 cm) from the end of the wire to the shield termination to allow the

hood to be easily installed. Note that the hoods supplied by NAT in installation kits are

'clamshell' hoods, and are installed after the wiring is completed.

Generally, all wiring should be at least 22 AWG, except power and ground connections,

which should be 20 AWG - check the appropriate Interconnect drawing for the unit

under consideration. Ensure that the ground connection is clean and well secured. To

prevent inadvertent system failure, power to this system must be supplied from a

separate breaker or fuse, and not bundled to any other source. A 1A breaker is

suggested (28 Vdc source).

Notes:

1. The case is grounded electrically and should be attached to a grounded surface

for correct RFI shielding. A pin is provided for grounding the case, and this must

be connected via its own wire to a suitable ground, not jumpered to the power

ground wire connection.

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2. The interface cards for the RT9600 and RT7200 have different locks from those

on the original harness. The tight packaging on the Tac/Com control head does

not allow spring locks to be used. The harness locks must be changed to

jackscrews to match the Tac/Com connectors before flight. New locking

hardware is furnished with the control head when these cards are installed.

2.3.4

Mechanical Mounting

Installation should be in accordance with AC 43.13-1B chapter 7, sections 3 to 7 and

AC 43.13-2A chapter 2.

Mounting is accomplished in a standard Dzus rack or rail assembly with a clearance

opening of 5", and full width dimension of 5.75". The rail height required for mounting

the various control heads is shown below.

Tac/Com Series

250/260 and 350/360

450A

Rail Height Required

3.00"

3.75"

450B and 460B

450/460

3.375"

4.875"

Be sure that adequate rear cable clearance is allowed when planning console

installations. Refer to the aircraft structural repair manual and maintenance manual for

instructions and information pertinent to this installation.

2.3.5

Notes

2.3.5.1

Control Head System Connector

The J100 System Connector Power/Lights/Ground connections must be provided for

operation of the overall system, in addition to the basic interface card-to-radio

connections. For specific RT9600/7200 radios, see the relevant Interface Card

supplement (SM06\PQRU\810-0) for an alternative method for providing these

connections to the control head.

Pins 7, 10 and 22 are serial data control lines that may be brought out to a connector for

serial loading of the control by a PC. This allows easy large scale data changes without

removing the control head from the aircraft. NAT provides a special software package

for this function. This port may also be used for Master/Slave operation or the DTE12

DTMF/Keyboard Data Unit.

2.3.5.2

Additional Mounting Considerations

LED display units come in several different display filter styles (see Section 1.6), and

the panel location and filter type should be matched for the best performance. LED

displays offer very wide viewing angles, and are suitable for centre console mounting

and locations not in the pilot's direct field of vision.

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2.4 Post Installation Checks

SM06 Rev. 4.10

Before the unit is permanently mounted, perform the following functional tests and make

any needed adjustments and switch or jumper settings. Ensure that the unit is securely

mounted before any flight is attempted.

2.4.1

Voltage/Resistance Checks

DO NOT ATTACH THE TAC/COM CONTROL HEAD UNTIL THE FOLLOWING

CONDITIONS ARE MET.

With the Tac/Com control head disconnected from all of its mating connectors, make

the following measurements on the system connector P100 mating plug (25-pin)

whether it comes from an FC41 adapter cable or from the basic airframe wiring:

Check pins <1> and <2> for +28 Vdc relative to ground.

Check pins <13>, <14> and <15> for continuity to ground (below 0.5 ohms).

Check pin <3> (28 Vdc), pin <4> (14 Vdc) or pin <5> (5 Vdc) for proper lamp

dimmer voltage.

Check pin <16>, <17> or <18> for continuity to ground as above (lamp return).

If the control head uses only the RT9600/7200 plug-compatible interface card, it is

permissible to not use the system connector, and instead use the existing wiring from

the C-962/722. In that case, make the following checks on the C-962/722 25-pin audio

connector:

Check pin <19> for +28 Vdc relative to ground.

Check pins <10>, <12> and <20> for continuity to ground (below 0.5 ohms). Pin

<12> should be a separate wire to ground.

Check pin <16> (28 Vdc), pin <15> (14 Vdc) or pin <17> (5 Vdc) for proper lamp

dimmer voltage.

2.4.2

Power On Checks

WARNING:

High volume settings can cause hearing damage.

Set the headset volume control to the minimum volume

setting prior to conducting this test and slowly increase the

headset volume level to a comfortable listening level.

Power up the aircraft's systems with the Tac/Com control head and RT's installed, and

turn ON all of the radios and other accessories required for this system.

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Make the following performance checks (refer to Section 3, Operation):

Confirm that the desired radios are installed in the assigned Tac/Com control

head slots (this data appears at power-up on the display). If any aspect of the

radio assignments is incorrect, or if messages such as 'waiting for slave' appear

when there is no slave, etc., the set-up of the control head may be incorrect.

Consult the Installation Configuration Mode section of this manual (Section 3.12),

or contact the Product Support department at NAT for instructions on how to alter

this data before proceeding.

Check for correct radio operation and channelling, both receive and transmit, and

ensure that all status indications are correct (TX and RX). Do not proceed until

the radios are operating correctly. It may be necessary to set the display screen

(after the last radio) on the control head to obtain a clear or bright display.

Correct squelch operation may require setting the AUDIO and FAST SQUELCH

pots on the top of the control head (NT-series radios only). The FAST pot is set

for the correct trigger point of the panel indicator (scan trigger point), and the

AUDIO pot is used to set the audible squelch threshold. These are factory set,

and any field adjustment may cause problems.

If squelch settings are to be made in the aircraft, use a calibrated signal

generator connected directly to the radio. The visual squelch indicator must be

set so that it appears at the same point as the audible squelch. Note that the

visual trip point (fast squelch) has no hysteresis, while the audible trip point will

remain tripped as the input level is decreased. This is normal and required for

correct operation.

If remote channel switches (Tac/Com II only) or a DTE12 (Tac/Com II only) are

installed, confirm that all remote channelling and editing functions are working.

All of these connections are via the system connector, J100/P100. DTE12 data

is serial, while the external remote switches are ground closures (pulled up to

+5 V internally).

Check each antenna feedline with a through-line wattmeter and suitable frequency

elements at the RT to ensure correct antenna matching. Reflected power in

excess of 25% represents a serious problem and should be investigated carefully,

or serious RFI and system interference as well as possible radio damage may

result. Check that forward power is to specifications for the radio in use.

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2.5

Troubleshooting

Weak Receive/Transmit, Intermittent Operation, Erratic Squelch

2.5.1

Ensure all antenna mounts are secure, cleanly grounded, and well terminated. Avoid

sharp coax cable bends or crushed coax from tie wraps. Never mount any antenna on

a composite surface unless a well-grounded and adequately sized (equal in radius to

the height of the antenna) ground plane has been provided. Keep antennas widely

separated, especially between VHF radios, and VHF and UHF radios. Bad antenna

matches and close proximity will result in large amounts of spurious radiation, which

may affect VHF-FM to VHF-AM operation and may result in harmonic interference

between VHF and UHF radios.

2.5.2

Strange Noises, No Receive Audio, Transmit Keying problems

Buzzes, hums or other background audio noises are symptomatic of multiple grounds or

noisy external systems such as inverters, blowers or pumps sharing wiring with the

audio system connections. Failure to key or correctly modulate a transmitter, or no

receive audio is often caused by not connecting all required grounds or wires to the

radio or external audio system. Check to make sure that the MIC AUDIO and PTT lines

are not reversed (keys, but no TX audio). Be sure both audio output wires are

connected from the transceivers (no or very faint RX audio).

A special caution is that no audio ground should be taken from the front instrument

panel or similar location that shares a ground return with a turn and bank or horizon or

other motor driven instrument. If this caution is not observed, the sound of the t&b

motor may be heard mixed in with receiver audio.

2.5.3

Some Frequencies Can't be Edited

Some frequencies are not really agile entries (such as crystal guard frequencies), and

as such should not be edited during normal operation. All such entries must be set via

the MASTER EDIT mode (see Section 3.11).

When in the SIMPLEX mode (RX and TX frequency lines display an 's'), you cannot edit

the TRANSMIT portion of the radio channel assignments because there is actually a

valid TRANSMIT frequency stored. It is temporarily hidden because of the SIMPLEX

function. To edit these frequencies, simply return the control head to DUPLEX

operation via the STATUS EDIT function or front panel switch, as appropriate.

2.5.4

Display Brightness is Too Low, Can't Increase to Full Brightness

The intensity of the display is set by two functions, the level set from the display screen

(advance the cursor past the last radio, then set the brightness up or down with the

SELECT switch) AND the status of the panel dimmer line. If the dimmer is active, then

the display automatically dims to HALF BRIGHTNESS of the previous setting. In some

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aircraft, such as Aerospatiale airframes, there are two dimmers, one of which MUST be

ON for normal daylight flight, to drive engine instruments. If this line is accidentally

used, then the display will always be at half intensity. A dimmer must be used that is

OFF during normal daylight flying, and ON during night flying for correct control head

operation. Early control heads (prior to Tac/Com II) did not have this automatic feature,

which has been added to improve night visibility by reducing display glare in the cockpit.

2.5.5

Amber (RX) Squelch light comes on, but no RX audio is heard.

Press the HELP/SQ button. If audio is heard, this means there is a problem either with

the subaudible tones, or with the AUDIO squelch setting. Refer to the CTCSS or

Subaudible Tone Table in Section 3.5.4.2 of this manual to check the CTCSS tone

format and frequency, and/or refer to the Power On Checks section (2.4.2) to check the

audio squelch.

2.6

Final Inspection

During the test flight, check levels and operation of all functions. Display brightness or

contrast may have to be tailored for adequate viewing by the flight crew. Ensure there

is no interaction between any transmit functions and received NAVAIDS, or any other

communication receiver functions. Antenna placement or cable routing may have to be

changed if these problems are encountered. Closely spaced antennas or coax cable

runs may cause problems, especially between VHF systems (AM & FM), and between

VHF transmissions and UHF receiving (due to third harmonic relationship), particularly if

the RT406F (with its less selective front end) is used in a complex system.

Ensure that there is no interaction between Tac/Com control head operation and ADF

performance. If interference exists, relocation or re-routing of the interconnect cabling

may be required.

Before leaving the aircraft, ensure that all the mating connectors are securely fastened

to the Tac/Com control head. Also ensure that the unit is securely fastened to the

aircraft from the front panel, and that all Dzus fasteners are locked.

If all functions are satisfactory, the aircraft may be released for service once all required

log entries, electrical load and weight and balance amendments are made, the flight

manual supplement is updated, and the required local regulatory paperwork is

completed.

There is currently no Technical Standing Order (TSO) for FM

Communication systems, regardless of manufacturer.

2.7

Continued Airworthiness

Maintenance of the Tac/Com Series control heads is ‘on condition’ only. Periodic

maintenance of this product is not required.

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2.8 Installation Drawings

SM06 Rev. 4.10

This section has the complete interconnect drawing set for all installations, both current

and previous revisions. Be sure to use the correct drawings for your installation. Any

unique notes for a given installation type appear in the relevant Interface Card

Supplement and in Section 2.3.5. Consult this section for any information that may apply

to your specific installation.

All information for interface cards will be provided by Manual Supplements, available by

contacting NAT Ltd.

2.8.1

Outline drawings

DRAWING

REV. DESCRIPTION

TYPE

TH250\NF903

Control head plan view (3.0")

Control head plan view (4.875")

Mechanical

TH450\NNFF903

Mechanical

TH250\NN\905-0

TH260\905-0

1.01 Faceplate of Typical Tac/Com II, TH250

Faceplate

1.01 Faceplate of Typical Tac/Com II Slave, TH260

TH350\NNN\905-0 1.00 Faceplate of Typical Tac/Com II, TH350

TH360\905-0 1.10 Faceplate of Typical Tac/Com II Slave, TH360

TH450\NNNN\905 1.00 Faceplate of Typical Tac/Com II, TH450

TH460\905-0

1.01 Faceplate of Typical Tac/Com II Slave, TH460

CH200\NF905

CH400\NNRR905

Faceplate of Typical Tac/Com I, CH200 (LCD)

Faceplate of Typical Tac/Com I, CH400 (LCD)

2.8.2

System Connector (J-100)

DRAWING

REV. DESCRIPTION

TYPE

CH400-1\403-1

Tac/Com I System Connector s/n 1001 – 1043

Interconnect

CH400-1\403-2

CH402-1\403

TH402-1\403-0

CH410\403

Tac/Com I System Connector s/n 1044 – 1127

Tac/Com I System Connector s/n 1127 and up

Interconnect

1.03 Tac/Com II System Connector s/n 1001 and up

Interconnect

Tac/Com I Master-Slave Installation

Interconnect

TH460\403

Tac/Com II Master-Slave Installation

Interconnect

TH460\403-1A

CH400-1\405-1

CH400-1\405-2

CH402-1\405

TH402-1\405

Tac/Com II Master-Slave Installation with DTE/DP12

Tac/Com I System Connector s/n 1001 - 1043

Tac/Com I System Connector s/n 1044 - 1127

Tac/Com I System Connector s/n 1127 and up

Tac/Com II System Connector s/n 1001 and up

Interconnect

Connector Map

Section 2 ends after these Drawings

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Section 3 Operation

3.1

Introduction

Information in this section consists of the functional and operating procedures for the

Tac/Com Control Heads.

3.2

General

To understand the operation of the Tac/Com control, a quick review of basic FM radio

operation is helpful here. It is normally a requirement to carry out the following general

operations on any FM radio system.

Turn the radio on and off.

Adjust the receive volume of the radio.

Select the required channel on the radio.

Optionally select/enable any special tones required for proper network

or repeater operation.

Optionally select/enable any guard receive or transmit functions.

It is also helpful to show visually that the radio is transmitting or receiving, so that the

pilot is assured of correct performance. If the radio is 'frequency agile' (i.e., the

frequency of operation can be set directly by the operator) a method must also be

provided to enter the specific frequency data, and identify and store the information.

Every manufacturer attacks these requirements in a different manner, and since the

Tac/Com system provides the ability to interface with other manufacturer's equipment

as well as NAT's own transceivers, a uniform method of operation must be provided.

How each common operating function is accomplished in the Tac/Com system is

described in the following sections. It is also possible to interrogate the control head

itself for help in learning how to operate it, simply by pressing the HELP button during

the first power-up screen or at any time while editing.

The on-line help function for the system is comprehensive enough to address most

operational questions, and corrects a long standing problem in the cockpit relating to lost

or missing operator's manuals. Every control function and valid editing choice is fully

explained through this system, which can be activated by pressing the HELP button.

It is important to remember that the many radios simultaneously controlled by the

Tac/Com system may have very different features and attributes as well as frequencies.

If the radio was incapable of some functions prior to connection to the Tac/Com head, it

will not suddenly acquire all the functions possible just by connection to the Tac/Com

control. Crystal controlled radios, such as the FliteFone 40, for example, do not

suddenly become agile radios, and Flexcomm radios don't scan simply because they

are connected to a Tac/Com control head. Only NAT's own radios offer full capability,

which includes extended tones, DPL, encryption, scanning and variable transmit power.

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3.3

Initial Operation

Power-up Help

3.3.1

Turn the Tac/Com system on by rotating any radio volume control away from the OFF

detent position. The software revision number will be briefly displayed, followed by a

screen presenting an option for use of the on-line HELP system, as shown below.

HELP=Instruction

RADIO=Operation

If help is selected (i.e., the HELP button is pushed), the control head will present a

tutorial on the operation of each control head feature. To advance through the tutorial,

press HELP after reading each screen. To exit this initial help function at any time,

press the RADIO button, and the control head will begin normal radio operation.

3.3.2

Initial Operating Display

If help is declined (by using the RADIO button as directed), the control head will display

a summary of the installed functions and current settings for each radio (this feature can

be disabled in the installation set-up for faster start-up). Once all of the functions have

been displayed, the radio will be ready for normal operation.

Once normal control head operation is selected, the display will install the radio and its

settings as specified by the interface card and software set-up instructions. This will

produce the following system message on the control head:

NAT NT-150

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NAT NT-150 or WULFS RT-7200 (etc.)

This is the radio type designated for that transceiver slot in the control head (RT1-4),

and will change if either the interface card, the stored software set-up or hardware

jumper selections are changed in the control head. This message is to advise what the

control head thinks should be in that interface slot.

Next, the status of the radio is presented which represents the state of its radio-wide

functions such as transmit power, duplex operation or tones. A summary of all the

selection options will be displayed, unless defeated in the installation software set-up to

speed up turn-on of the control head. This display will produce messages such as

those shown below, for each radio:

POWER=LO, TONES=OFF (etc.)

The control head will continue with each radio in sequence, and will finally position the

cursor (arrow) by the selected radio when it has finished. There may also be messages

such as those shown below, which are system error/alert messages reported by the

Tac/Com control head:

NO I/F BOARD

There is no interface card installed in this specific slot (RT1-4) inside the Tac/Com

control head. This message appears if there are empty slots in the control head, to

warn that the panel controls are inactive.

-- NO RADIO --

When tested by the Tac/Com control head, no radio was found installed in this specific

slot. It may have been removed for service, used in another aircraft, or have the

mating connector disconnected.

-- RADIO OFF --

When checked by the Tac/Com control head, the radio was found to be turned off or

defective (if turned ON at the front panel). This message also appears for Flexcomm

radios if they are removed from the aircraft, as they do not support the -- NO RADIO --

function.

3.4

Front Panel Controls

There are two main groups of controls, and a 2-, 3- or 4-line by 16-character display on

the Tac/Com control head. The first group of controls is 'radio specific', and affects the

operation of only a single radio (there can be up to four installed in a single control

head). The second are general controls that affect the over-all operation of the control

head. The function and relative location of these important groups is as follows:

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3.4.1 Radio Specific Controls

SM06 Rev. 4.10

Radio-specific

Controls

Radio specific controls allow the general operation and function of each radio to be

modified independently. The radios are identified as 'RT1, RT2', etc. to the left of the

display, and the line of text continues through the display to connect to the specific

controls for that radio on the right hand side of the control head. The exact functions

that are provided on the front panel via the radio function switch will vary with each radio

type. Some radios support very few features, while others require both the front panel

switch, and a number of status line functions to set all of the radio functions. Guard

controls are not available on all units.

3.4.1.1

Guard Controls

Guard RX Volume

RX Status

Guard

Channel

Select

In general, the GUARD volume control permits a zero volume level without turning the

radio off, but in some instances, such as USFS GUARD RX controls, this will not be

true. OAS government contracts require that this level not go to zero regardless of pot

setting, with a minimum fixed output at all times.

A second set of controls is provided for guard operation only when 'H', 'U' or 'V' interface

cards are installed. Note that the GUARD volume control has no OFF detent position.

Forcing the control fully counter-clockwise may cause switch damage. The internal

minimum guard volume adjustment is accessible through the right side of the control

head. The additional guard controls provide selection of the guard 1 and guard 2

channels, plus a separate RX status indicator.

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3.4.1.2 RX (Receive) Volume Control

Tac/Com Control Head Manual

RX Volume

Controls

The RX volume control is adjusted via the round knob for each radio. Rotating this

control fully counter-clockwise to OFF turns the specific radio off. If all controls are

OFF, then the control head itself turns off.

3.4.1.3

RX/TX Status Indicator

RX/TX Status

Next to the volume controls are bi-colour indicators that display TX (Transmit) status or

RX (Receive) status. If that specific radio is keyed to transmit, the LED will be green. If

a signal is being received, the LED will be amber.

A radio that is receiving may still not produce any audio, if the tones or DPL codes for

that channel do not match the tones or DPL codes set in the control head. If tones are

set to ON for a given radio from the status line, then all data (frequency and tone/DPL

code) must be correct to hear the receive audio. If tones are OFF, then all incoming

transmissions are received. The indicator lights whether the logic is correct for audio or

not, to warn the pilot that channel is active with radio traffic of some kind.

If the radio is idle (not receiving or transmitting), the LED will be off. The colour coding

used for these functions corresponds to the existing indications used in the FF40, C-62

and C-1000, for pilot familiarity. It is worth noting that these conventions are reversed

from vehicular standards, and may be confusing for some emergency services staff

used to land mobile equipment. When used with a Wulfsberg radio equipped with a

guard channel, both the main and guard RX signal will illuminate the RX LED, unless

equipped with separate guard controls.

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3.4.1.4 Radio Mode Switch

SM06 Rev. 4.10

Radio

Mode

Switch

The last radio specific control is the MODE or FUNCTION switch, which varies with the

type of radio used. For NT-series transceivers, it selects either NORM or SCAN modes

of operation, as specifically defined in the status line.

For NT-series transceivers scanning occurs at 90 channels/second/radio, and the

following scan modes (defined in the status edit mode) are:

LIST (up to a block of 32 channels/list).

PRIORITY (up to 2 priority channels + active monitor channel).

LIST+PRIORITY (2 priority + 30 channels in a given block).

Priority monitoring is 3 times/second for a 10-15ms sample. The radio will re-channel to

the priority channel if traffic is detected, and returns to the monitor channel (channel the

radio was resting on when scanning was selected) after a 2 second latency. All CTCSS

tones or DPL codes are inactive during scanning (due to lock delay).

With some radios, this mode switch is reserved for GUARD or MAIN transmit selection,

as scanning is not supported. It may also select SIMPLEX or direct (repeater talk-

around) operation as opposed to NORM (Duplex) or repeater operation. Data for all

channels is stored as individual TX and RX frequencies, which permits them to be

entered and used in any way. The forced SIMPLEX function pushes the stored RX

frequency into the TX slot temporarily to permit 'talk-around' of an existing stored

repeater frequency, and avoids having to store a separate channel with this information.

3.4.2

General Controls - NORMAL Operation

The general control head functions include the switches that effect the over-all operation

of the control head. Some of these switches have dual functions depending on control

head mode of operation. The two modes of operation are NORMAL and EDITING.

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The TOP ROW is for NORMAL OPERATION.

CHAN RADIO

SELECT NEXT EDIT

HELP

The BOTTOM ROW is for EDITING.

To show that they are related, engraved panel lines tie the EDITING functions together.

The alternate EDITING functions become active whenever the EDIT switch is in any

position other than OFF.

3.4.2.1

Display Switch

The DISPLAY switch works the same in both NORMAL and EDIT modes of operation.

The DISPLAY switch determines what data is shown on the individual channel

presentations for each radio. Either the alphanumeric channel name or identification (ID

position), or the actual channel frequency (RX and TX positions) can be displayed.

When editing, this also determines what will be edited. Whatever data is visible is the

material that can be edited. During normal operation, the crew can select whatever

presentation is the most helpful to them, which is generally the ID or channel name

display. The cursor, or left hand arrow, shows which radio is set up for channelling or

editing.

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3.4.2.2 CHAN -/+ Toggle Switch - NORMAL Operation

SM06 Rev. 4.10

Channel Switch

To change channels, press the CHAN switch in the desired direction, either + for

ascending, or - for descending numbers. Channel selection can also be accomplished

remotely if the remote channelling switch is installed. The radio that has the cursor in

front of it is the one that will be channelled.

Channel numbers will increase from a02 upwards (a03, a04, etc.) with each press of the

switch to '+' position. If the switch is held to either position, it will scroll rapidly,

increasing in speed the longer it is held down.

3.4.2.3

RADIO Push Button - NORMAL Operation

Radio Pushbutton

This push button switch picks the active radio selected for any operation. The radio

selected is indicated by a triangular cursor to the left of the channel number (RT1 in this

example). Cursor movement is from top to bottom, to the brightness screen and then

returns back to the top again.

The radio that has the cursor in front of it is the one that will be channelled (RT1). To

select RT2, press RADIO. If pressed a second time, the display brightness screen will

be displayed.

When selected, a radio may be channelled, edited, or the manual squelch test operated. It

has no bearing on transmit or receive capability, and only serves as an indication of which

radio the control head is prepared to perform some operation on. This selection works in

increasing order only (1,2,3,4, display brightness), and then re-starts at the beginning.

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3.4.2.4 EDIT Switch Function - NORMAL Operation

Edit Switch

When the EDIT switch is in the centre-off locked position, all editing functions are off,

and the control is in normal operation. It the switch is set to any other position, then

editing is active, and either radio or channel data can be altered by the operator.

3.4.2.5

Squelch Function - NORMAL Operation

HELP=Instruction

RADIO=Operation

Squelch

Pressing this button during the power-up screen presentation (when the control head is

first turned on) will take the operator through detailed help screens for each function of

the control head. In the normal operation of the control head, this is the only access to

help (on power-up), as this button is then the manual squelch (SQ) test button for the

selected radio.

The squelch test function is useful for monitoring activity on a radio when tones prevent

the squelch from opening normally, or to verify volume settings or radio function.

Pressing SQ over-rides all squelch logic, and lets the radio's raw receive signal pass to

the ship's audio system.

When the locking EDIT switch is in any position other than OFF (centre), the HELP

switch again becomes active, and provides context sensitive help for whatever function

is being attempted, such as frequency entry, tones or labelling.

These two modes of help (power on and edit) provide assistance to the pilot/operator

without interfering with the selected operation of the control head. If, basic help is

required after the Tac/Com control head is already on, cycle the control head off again

(turn all volume controls to OFF, or cycle the external breaker), and when powered up

again, the option for comprehensive help will re-appear.

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3.5 Editing

SM06 Rev. 4.10

Editing is the general term for changing any information stored in the Tac/Com control

head.

There are two basic types of editing that can be selected from the front panel of the

control head. These are CH (channel) editing, and ST (status) editing. As the name

implies, channel editing permits channel data to be controlled by the operator. This

includes channel names, the transmit and receive frequencies and matching tones,

scan flags (for list scan) and for some radios, channel discrete lines. To edit different

channel information, such as frequency data or channel names, it is necessary to first

select which information (ID, RX, or TX) will be edited via the DISPLAY switch.

There is simply not enough room to fit every possible function switch that might be

needed for a given radio on the front of a Tac/Com control. Some radios also have

many more functions than others complicating this control arrangement. The solution

for this clutter is the use of the status line to show features that are important, but not

constantly in use on the front panel. Status functions can be as extensive as required

for a given radio. The internal editor permits only valid choices at all times, so that the

operator is not required to know a great deal about the specific radio in question, but

only what needs to be accomplished.

Editing Controls:

Two sets of legends exist for each of these switches. The bottom row (connected by

lines) represents the function of the switches during the edit mode of operation. It takes

some time to become familiar with the dual nature of these switches, but they greatly

reduce clutter on the front panel, and make it possible to package all of the required

functions into a size mechanically compatible with other systems.

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3.5.1 Channel Editing

Tac/Com Control Head Manual

EDIT Switch

When the EDIT switch is in the CH position, the ID, RX, and TX information may be

edited. The position or character to be edited will flash or blink on and off. When

channel editing of data is in progress, operation of the radios is suspended, and the

dual function edit switches work in the following way:

3.5.1.1

SELECT Switch

SELECT

Switch

This switch is used to step the data entry up or down (+/-) on the currently marked radio.

The character that will be selected flashes. This flashing character is referred to as the

editing cursor, since it shows what is about to change. The intelligent editor within the

control head only permits a valid choice for every position for data entry. This is to aid

operators in reducing entry mistakes, particularly when busy with other flight

procedures.

The selection choices are strung together in a circle, and choices move through this

circle with the SELECT switch as shown below in the diagram:

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SM06 Rev. 4.10

Depending on which way the SELECT switch is set (+ or -), the choices will move

around the circle in either direction. The editor removes numbers from this circle that

don't apply to the particular cursor position. For example, VHF High Band radios can

only have a 3, 4, 5, 6 or 7 in the 10's of MHz position, so no other numbers are

permitted during editing from the front panel in this location. Some radios do not

channel below 150 MHz, so then the editor removes the 3 and 4, and so on through

each position that can be edited.

When editing the channel ID label or name, the editor opens the circle to include all the

alphanumeric characters, and some frequently used symbols, like the blank (visible as a

flashing underline '_' to show the cursor location), slash (/) and number sign (#). The

choices for selection are shown below:

3.5.1.2

NEXT Switch

Switch

This push button switch cycles the editing cursor from left to right to the next character

to edit. The editor will change what choices are valid as the cursor moves from one

character to the next.

Sometimes more than one character will flash. This is because the only valid choices

involve two characters, such as the fractional kHz entry for a channel frequency. This is

also true for tone code entries. The SELECT switch will then scroll through the

available entries from an internal table.

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Note that a STAR appears at the right side of the RT #2 ID label in the diagram below.

This means that the channel discrete line is enabled for that channel. This is a line to

control external switching of a special function. It is programmed just like a scan flag,

by advancing to that position with the NEXT button, and then toggling the entry with the

SELECT switch. There is only one channel discrete line to set, and it appears only for

the Flexcomm radios. This is a seldom-used function, and is provided for compatibility

reasons only.

3.5.1.3

EDIT Switch

EDIT

Switch

This locking, centre-off switch shifts the operation of the control head from editing back

to the normal operating mode. For normal radio operation, it must be returned to the

centre or OFF position. No special activity is needed to store the data that has been

entered while editing. It is stored as soon as it is entered. When editing is finished, set

the EDIT switch back to OFF.

3.5.1.4

HELP Switch

HELP

Switch

The help screen may be accessed at any time, and for any function, while in the edit

mode. Press the HELP button if the operation of any function is unclear during editing.

Information will be provided for the desired edit function, and if pressed while channel

editing in the tone character position, will bring up the complete tone look up table for

reference.

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3.5.2 Summary of Channel Editing

SM06 Rev. 4.10

For each channel stored in the control head, there are three possible data entries;

identification label (ID), receive frequency (RX) and transmit frequency (TX). If

equipped, the radio may also have tone and scan information associated with these

entries. Note that non-agile radios can still have frequency data entered in the master

edit mode (for reference only), but changing this data will have no effect on radio

operation.

The ID label or channel name has no effect on radio operation, and is provided for

operator/pilot convenience in identifying the selected channel. Any alphabetical

character, the numbers 0-9, and some punctuation (space # . - / ) may be inserted in the

ID label.

Help can be used at any time when editing, to give instruction for the operation being

performed. The exact data that pressing HELP provides depends on the current

activity, as it is context-sensitive. Editing tone locations and pressing HELP will bring

up the tone look-up table. Editing channel frequencies will bring up frequency

information, and so on.

It is important to remember that while frequency data may be edited, the radio itself

must be an agile radio, with the AGILE MODE ENABLED on the interface card for any

change to actually take place. Crystal controlled radios, or PROM coded radios which

allow editing of this data in the master edit mode (for reference only), will not change

frequency after editing. Receive frequency editing is also allowed for guard channels

(also crystal controlled) used in some radios, but again, this is for reference only, and no

change will take place in the operation of the radio.

When editing RX or TX frequency data, only those frequencies the control head

recognizes as valid can be entered, and only in the fractional multiples allowed. If

mismatched multiples occur when editing, a warning message, FREQ ERROR will

appear, because the RX and TX frequencies must both be divisible by the same

synthesizer interval.

The last positions (far right hand) on the RX and TX lines are for tone data (these

locations have scan flags on the ID line). Depending on the type of radio installed,

differing codes are possible here to represent the CTCSS (or sub-audible) tones used

for repeater or squelch control. A different tone can be set for receive and transmit. the

capability to have tones can also be enabled or disabled through the status lines,

providing the radio will support this function. If the tones are enabled (via the status

line), an '=' (equal sign) will be displayed between the channel number and following

information on all three presentations. If the special function, DPL, or Digital Private

Line has been enabled at installation time, then 83 different 3 digit DPL codes are

available for use with NT-series radios.

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3.5.3 Summary of Channel Labels

Tac/Com Control Head Manual

Tac/Com permits two kinds of channel numbers (set at installation time) for ease of use

and as a memory aid. Block numbers begin with a letter, a-d, and have 32 channels per

block. This allows channels to be grouped together for convenience (i.e., all channels

for forestry in one block, all EMS in another, all police in another, etc.), and also clearly

shows which channels can be scanned together as a group. NAT NT-series radios hold

32 channels at one time for scanning, and they must be from the same block. Block

numbers are a reminder of which channels are grouped together.

Blocks:

a01-a32

b01-b32

c01-c32

d01-d32

Sequential Numbers:

001-032

033-064

065-096

097-128

The control head can also be set to show 128 sequential channels (or some lesser

number, if preferred, and if it has been set up that way at installation time). In this case,

the channel numbers go 001 to 128. This is often used with Flexcomm radios, where

there is no scan function.

There is also one additional mode, which is supported only on the NT136-PAS multi-

mode transceiver. In this case, channel numbers are labelled A01 to A64 and F01 to

F64. The 'A' channels are AM, and the 'F' channels are FM. Each 32-channel block

may be scanned within each bank (1-32 and 33-64), but all channels must be AM or FM

within the scan group.

Blocks:

A01-A32

A33-A64

F01-F32

F33-F64

Sequential Numbers:

(equivalent)

001-032

033-064

065-096

097-128

In addition to using the front panel channel and radio switches, the remote channel and

radio switches may also be used, if installed. They work exactly the same way as the

front panel switches.

A DTE12 or DP12 can also be used to access a channel directly by number. In this

case, just key in the number (sequential number) and press the ENTER key on the

DTE12. It is important to understand how channel numbers work, because some things

may occur on the display that might be confusing. An example is shown below,

demonstrating what happens when the control head is channelled below a01.

Note that the control displays the message

REPROGRAMMING while it re-loads the next

block of 32 channels into the NAT radio for

scanning. This happens very quickly, but creates

a short pause when scrolling through each block

of 32 channels.

> REPROGRAMMING

127=FORESTRY * -

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As soon as the data is loaded into the radio, the next channel in the next block appears

(d32). Channels wrap around from highest to lowest, so that it is never necessary to

reverse direction to advance to any channel.

3.5.4

Summary of Subaudible Tones

Subaudible tones are sometimes used to screen unwanted transmissions on shared

frequencies. They are often referred to as PL Tones or Private Line Tones. The correct

name defined by the Telecommunications Industry Association (TIA) is Continuous

Tone Controlled Squelch System (CTCSS).

Tac/Com has stored a useful tone look-up table inside the help function. To view it, edit

a channel and move the editing cursor (flashing character) to the far right hand position

where the tone should be. Pressing HELP there will allow the CTCSS tone table to be

reviewed.

3.5.4.1

Methods of Tone Display

Over the years, many different codes have come into existence to describe these tone

sub-audible tone frequencies. They are listed below:

Tone Frequency (FREQ): - This is the TIA standard.

This is a frequency below 300 Hz that uniquely identifies the tone key that is

used to control the radio squelch (allows audio to be heard), or control a repeater

function. There are only three digits available on the control head for this data,

so any decimal fraction is omitted from the display (i.e., 103.5 Hz becomes 103).

Although not displayed, the correct frequency is still used.

EIA Codes (1-32):

This is a sequential number from 1-32 (or 38) that identifies the tone in order

from lowest (67.0 Hz) to highest (203.5 Hz or 250.3 Hz), as defined by the

Electronics Industry Alliance (EIA).

Wulfsberg Codes (WCODES):

These are sequential shifted OCTAL codes based on the thumbwheel design of

the C-1000 control. Because they are missing numbers ending in 0 & 9, they are

often confused with the straight sequential number for the EIA tones.

Motorola Codes (MCODES):

These are alphanumeric codes that seem largely random in assignment, but

often appear in the land mobile business if Motorola equipment is used.

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3.5.4.2 CTCSS or Subaudible Tone Table

Tac/Com Control Head Manual

The following table shows the relationship of the supported tone codes. All of these are

available in the control head, and when editing, the SELECT slew switch (+/-) will bring

up only valid choices for each type of code. Pressing HELP while editing these

positions of the channel data will bring up the tone table for reference. The Frequency

shown will have the decimal fraction truncated when displayed on the control head.

Tone Frequency

67.0 Hz

1-32 (1-38)

WCODE

MCODE

71.9 Hz

74.4 Hz

77.0 Hz

79.7 Hz

82.5 Hz

85.4 Hz

88.5 Hz

91.5 Hz

94.8 Hz

97.4 Hz

100.0 Hz

103.5 Hz

107.2 Hz

110.9 Hz

114.8 Hz

118.8 Hz

123.0 Hz

127.3 Hz

131.8 Hz

136.5 Hz

141.3 Hz

146.2 Hz

151.4 Hz

156.7 Hz

162.2 Hz

167.9 Hz

173.8 Hz

179.9 Hz

186.2 Hz

192.8 Hz

203.5 Hz

210.7 Hz (NAT)

218.1 Hz (NAT)

225.7 Hz (NAT)

233.6 Hz (NAT)

241.8 Hz (NAT)

250.3 Hz (NAT)

33 (NAT ONLY)

34 (NAT ONLY)

35 (NAT ONLY)

36 (NAT ONLY)

37 (NAT ONLY)

38 (NAT ONLY)

41 (NAT ONLY)

42 (NAT ONLY)

43 (NAT ONLY)

44 (NAT ONLY)

45 (NAT ONLY)

46 (NAT ONLY)

M2 (NAT ONLY)

M3 (NAT ONLY)

M4 (NAT ONLY)

M5 (NAT ONLY)

M6 (NAT ONLY)

M7 (NAT ONLY)

The multiple codes shown are available on current generation Tac/Com II controls only.

Previous generation Tac/Com I & II controls had only a single code, which was the

WCODE, for compatibility with existing aircraft transceivers.

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The additional codes and frequency display were added in the new control head

software in 1991 for USFS/OAS contracts. Tone data is often received in the EIA

sequential number format, or as the raw frequency, and requires additional tone support

for ease of use. Controls with USFS interfaces (guard controls) are set for the EIA

sequential tone code at the factory. Older controls (pre-1991 Tac/Com II) may upgrade

to current generation software for this expanded tone display.

3.5.4.3

Using Help to Get the Table

The tone code table is accessed by pressing HELP while editing a tone location during

channel editing. Scroll through the table by pressing HELP until the desired entry is

located. Press RADIO to exit, or continue through the table by pressing HELP until the

data entry screen is reached.

3.5.4.4

DPL Codes

NAT NT-series transceivers support 83 Digital Private Line Codes (DPL) in addition to

the CTCSS or Private Line subaudible tones. This option must be enabled at installation

time in the installation and configuration mode of operation. It is normally shipped set to

OFF by the factory to reduce confusion over tone codes.

DPL codes are three digit sequences that describe a digital code sent at low frequency

in the background of regular transmissions. They are filtered out of normal receive

audio and provide another method of signalling or squelch control.

Code numbers are arbitrary and are stored in an internal table. When in use, the

control head finds the correct entries based on how the code is entered. The FREQ

option for tone presentation is not available if DPL is enabled.

023 DPL Code If the '0' position is chosen for edit, the control head is

programmed to select a 3-digit DPL code and bring up the

table for the SELECT switch to choose from.

Tone Code If the first digit position is skipped, the control head is tone

code programmed to select a 2-digit CTCSS tone code and

bring up the table for selection.

This arises ONLY if DPL is enabled. For most users, this selection will not be used

because only subaudible tones are used.

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SM06 Rev. 4.10

3.6 Status Line Editing

Tac/Com Control Head Manual

The status lines for each radio contain all the extra functions supported by the radio.

Because this is largely defined in software, it also provides a very cost-effective method

of upgrading the system performance or features through simple software (EPROM)

changes, rather than radical panel re-design. Some radios may have little or no

function support (such as the FliteFone 40), others may have many features (such as

NT-series RT's) including power level shift, scan, tones, and priority.

Like editing other data, only allowable options are presented, guided by the control

head’s reading of the interface card's capability and the stored software installation set

up routines. This mode can also be used to display the status of the radio quickly,

without editing any data.

To edit status line data, press the RADIO button until the triangular cursor appears to

the left of the radio whose status is to be edited or displayed. Once the radio is

selected, ST(status) EDIT mode may be entered to change the information.

In this mode, each of the available functions for the radio can be set, or reviewed. Only

valid functions and choices will be presented. Note that for this radio, the TX mode

function is set for DUPLEX operation. Pressing NEXT will advance to the next function,

while pressing SELECT will select what choice is wanted for this function.

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3.6.1 NEXT and SELECT Switch Use

SM06 Rev. 4.10

SIMPLEX

This choice will cycle with the SELECT switch.

TX MODE This function will cycle with the NEXT switch.

Cycling SELECT will change the choice displayed for any given function.

To advance to the next function, press NEXT, and it will appear. Use the SELECT

switch to again insert the desired option, and continue in this manner until the radio

status is correctly defined. If NEXT is pressed again, the functions will cycle around

again in a loop to allow for any error corrections. The pattern of this selection is shown

below to illustrate the flow of information:

The specific functions that appear in this general loop vary with each transceiver type,

and to some extent, the version of the software. New generation Tac/Com II controls

have three scan modes, while older ones have only two. This can be upgraded by

replacing the EPROM in an older control head.

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SM06 Rev. 4.10

Tac/Com Control Head Manual

To illustrate the choices possible in the STATUS EDIT MODE, the following diagram

shows all the current options and choices for an NT-series transceiver. While this

appears complicated as a chart, it is very simple to use and just represents a sequence

of clear choices that cycle around for user selection.

When editing is finished, return the EDIT switch to OFF, and the information will be

stored. It is not necessary to go through the entire status listing, and exit is available at

any time. This feature may also be used to check how the radio is set up without

making any changes.

3.6.2

Status Edit Features

The status edit features currently implemented in Tac/Com are as shown and explained

below:

3.6.2.1

TX MODE=

There are two modes possible, either DUPLEX (REPEATER) operation, or SIMPLEX

(DIRECT) operation. This determines whether a common frequency is used for RX and

TX, or whether different frequencies will be used. This function over-rides what is

stored in the individual channel data locations, and allows those stored channels to also

be operated in SIMPLEX mode without taking up another storage location. Not all

radios have this capability.

3.6.2.2

TONES=

Most radios have this capability. TONES can be set ON or OFF for the radio by this

function, thus enabling or disabling any tones which may be set on a per channel basis

through channel editing. NAT NT-series radios and the RT-96/7200 also support a

tones mode of TX ONLY, which enables only the transmit tone, but not the receive tone.

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SM06 Rev. 4.10

This is used where the tones are needed only to open the repeater and serve no RX

squelch function.

3.6.2.3

POWER=

Some radios, such as NAT's NT-series and the RT-9600/7200 support a high and low

power transmitter function. Many radio station licenses have power restrictions at

altitude, and must be set to low TX power above 5,000' for legal operation. This may

also be required to prevent repeater interference at altitude, or to permit secure

operations.

3.6.2.4

TONE DISP=

New generation software now permits the user to define the tone presentation to suit

local operations on a radio-by-radio basis. This selection can be set to the tone

frequency referred to as FREQ, or to one of several codes. The sequential numbers for

the first 32 EIA tones are referred to as 1-32. The alphanumeric codes for Motorola

radios are referred to as MCODES. The shifted octal codes used by Wulfsberg are

referred to as WCODES on the status line.

To select the desired tone display option from the list, chose the desired display mode

with the SELECT switch. The options are 1-32, WCODE, MCODE and FREQ. Note

that the FREQ option will not appear if the DPL tones have been selected ON in the IAC

edit mode. Refer to Section 3.5.4.4 for more information.

3.6.2.5

SCAN=

For NAT series transceivers, the option of scanning a LIST, PRIORITY channels, or on

newer generation control heads, LIST + PRIORITY is provided. The Scan List channels

are edited in the second last digit on the ID line from normal channel edit mode. For

more details on scanning refer to Section 3.9.

3.6.2.6

P1=, P2=

The Priority 1 and 2 channels are selected by toggling the CHAN +/- switch. Two

channels are selected for each bank of channels (a through d). When the scan option is

selected to List, the priority channels are not active but are retained in memory.

3.6.2.7

GUARD RCVR=

The RT-9600 guard functions can be from either the front panel (U interface), or the

status line, depending on which type of interface has been installed in the control head.

If the status line is used (R or P interface) the line appears as GUARD=0 (off), 1, or 2.

For Flexcomm, the guard RX may only be enabled or not from the status line, as only

one channel exists. Front panel guard functions refer to guard transmit operation.

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3.6.2.8 PWR-UP CHAN=

Tac/Com Control Head Manual

This is the channel the control head will go to when it is powered up. This may be set

for each radio. On early Tac/Com I controls, only a specific channel could be set, but

current generation Tac/Com I & II motherboards have additional non-volatile memory to

remember the last channel used, and so can also provide an option of returning to the

last channel set prior to power down. This channel is referred to as the PDC or Power

Down Channel, and can be set as an option instead of any specific channel number.

3.6.2.9

ENCRYPTION=

NAT NTX138 radios are available with an encryption option. If installed in the radio the

control head will include a status line to allow the selection of encryption 'on' or 'off'.

3.7

Channel Display Summary

The NAT Tac/Com control heads provide three displays for each channel of stored radio

information as set by the DISPLAY switch at the lower left side of the control head.

3.7.1

Display Switch Set to 'ID'

ID or Channel Label Information. This is a name, such as FORESTRY, HOSPITAL or

BASE 5. The display format shows the CHANNEL number, ID LABEL, and any SCAN

FLAGS.

A typical ID Label might look like this:

a01= FORESTRY c

Channel

Label

Scan Flag

The '=' indicates that TONES ARE ENABLED. This appears only once the tones are

turned ON from the STATUS EDIT function. Tones can be stored, but not active, and

can be activated for TX ONLY, or both TX and RX, as required. TX ONLY is the normal

mode for forestry operations on USFS/OAS/BLM contracts. If all tones (both RX and

TX) are activated, no audio may be heard in some simplex operations, as no tones may

be present, and thus the radio squelch will not open.

SCAN FLAGS indicate which channels are flagged for monitoring during LIST SCAN.

Another flag can appear here, the PRIORITY SCAN FLAG for the P1 and P2 channels,

but this data is set from the STATUS EDIT function, as it can exist only once for each

radio, or once for each bank (NT-series radios). Both list & priority scan are supported

in NAT NT-series radios, and can be programmed by the operator. For Flexcomm

radios, a CHANNEL DISCRETE flag ([) can also be programmed, to be used for special

external switching. It appears in the same place as the SCAN FLAG on the display.

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NAT NTX138 radios provide wide-band and narrow-band operation. The bandwidth flag

indicates the selected mode. It indicates the current modulation acceptance and

transmit deviation mode. When a

character is displayed the channel is operating in

wide-band mode. When a

band mode

character is displayed the channel is operating in narrow-

A typical NTX138 ID line might look like this

s p

c 1

a01= FORESTRY

Scan

Flags

Bandwidth

Flag

Label

Channel

3.7.2

Display Switch Set to 'RX'

RX or Receive Frequency and Tone. This is the receive frequency of a given channel,

plus its Receive Tone (if any), displayed in the format selected previously.

A typical RX frequency might look like this:

a01= 156.875r

Channel RX Freq. Tone

The '=' indicates that tones are enabled from the STATUS EDIT function. The small 'r'

indicates that the data displayed is a RECEIVE frequency. If the radio is put into the

simplex mode, this will be replaced with an 's'. In SIMPLEX or DIRECT operation, the

radio's TX frequency is shifted to the RX frequency, to permit talk-around operation on

repeaters. The old data remains in the control head memory, but is not displayed.

3.7.3

Display Switch Set to 'TX'

TX or Transmit Frequency and Tone. This is the transmit frequency of a given channel,

plus its Transmit Tone (if any), in the format selected previously.

A typical TX frequency might look like this:

a01= 154.775t

100

Channel TX Freq.

Tone

The '=' indicates that tones are enabled from the STATUS EDIT function. The small 't'

indicates that the data displayed is a transmit frequency. If the radio is put into the

simplex mode, this will be replaced with an 's', and the TX frequency cannot be edited.

In SIMPLEX or DIRECT operation, the radio's TX frequency is shifted to the RX

frequency, to permit talk-around operation on repeaters. The old data remains in the

control head memory, but is not displayed.

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3.8 Changing Display Brightness

Tac/Com Control Head Manual

There is one additional display function, which is the INTENSITY/CONTRAST setting.

On LED controls, this is selected by advancing the cursor past the bottom radio. The

display brightness screen below will be shown. On a two radio control, simply press the

RADIO button two times if the cursor is set to the top radio, or once if set to the bottom

radio, and the screen below will appear. The display brightness is adjusted with the

SELECT switch. Press RADIO again to return to normal operation.

CHAN - = Dimmer

CHAN + = Brighter

On LCD controls, there are two ways of making this adjustment, either by the screen

described above, or by a DISPLAY/CONTRAST pot, if there is adequate room on the

front panel. The Contrast control changes the contrast ratio and viewing angle of the

LCD to suit varying light and position situations. If the display is subjected to dramatic

temperature extremes (hot or cold), it will alter the chemical properties of the display,

and may require an adjustment of this control to return the appearance to the desired

presentation.

3.9

Scanning

Scanning is an automatic internal function that rapidly samples radio channels under

operator control. The operator may select one of several predefined modes that control

how the radio will carry out this function (via the STATUS EDIT function), and has a

front panel switch to send the radio into this mode of operation.

Scanning is very useful for checking radio traffic on one or more channels, while

working a 'home' or monitor channel (the one the radio was on before scanning was

selected). When scanning is active, all CTCSS/Subaudible Tone or DPL Functions are

ignored, and with the NT150, the radio does not test for these conditions when

determining that a channel has been found. Tones remain active for squelch control.

This is because the delay to test for tones is so long compared to the radio lock-up time,

that scanning would be seriously compromised. NT-series transceivers scan at rates of

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SM06 Rev. 4.10

approximately 90 channels/second. It takes almost half a second to provide tone or

DPL decoding, which would result in virtually useless scanning of 2 channels/second. It

is therefore recommended that when using either the NT150 or the NTX138, the tones

should be turned off to prevent slow scanning.

When Scanning is active, the front panel CHAN switch is inactive (for that radio),

because channel control is taken over by the scanning logic in the control head. This

may cause some operator confusion if the control head has acquired a channel (while

scanning) and manual channel change is attempted. No change will occur, and the

radio must be selected out of SCAN into NORM operation for manual channel changes

to work from the panel control.

If the microphone for a transceiver is keyed while the control head is scanning, the radio

will be rechannelled to the 'home' or monitor channel for transmission.

When scanning, a signal needs to be slightly stronger than during normal operation

because the time interval for detection is so short. No tones or DPL codes are taken

into account when scanning. The radio will stop on any scan-designated channel that

has an RF signal present, but received audio may not be heard if the tones are

incorrectly set in the control head. To avoid any confusion, tones can be set to OFF (via

the status edit function) during scanning so that all channels will be heard.

Any channel can be designated as both a PRIORITY channel and a LIST channel within

the 4 banks of 32 channels supported by NAT NT-series transceivers. The appropriate

scan flags will then appear after the channel name in the ID mode (P1, or P2, and/or

SC). Any or all of the 32 channels in a bank can be in the list for LIST SCANNING, but

only one channel each may be assigned the P1 and P2 Priority designation.

NOTE: NAT NTX138 radios provide 128 continuous channels. Therefore there can be

only one pair of priority channels selected.

When scanning is selected by the front panel mode switch, a message will be displayed

to indicate what the radio is doing. On earlier Tac/Com controls, this message was

'SCANNING', but in new software revisions, the scan mode and bank are now displayed

for better operator understanding. These messages are now as follows:

Display

Scan Mode

L -SCANNING 'a'

P -SCANNING 'b'

LP-SCANNING 'c'

LIST SCANNING, bank 'a'

PRIORITY SCANNING bank 'b'

LIST+PRIORITY SCANNING bank 'c'

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3.9.1 Scan Modes

Tac/Com Control Head Manual

If priority scan channels are enabled through the status editing mode, the channel label

will then be followed by the ident: P1 or P2 viewed in the ID display mode, indicating

priority status. If the channel was added to the list scan mode, the SC flag will also be

displayed when viewing the channel label. Priority channels are selected by the status

line, as is the SCAN MODE (list or priority). Channels are tagged for list scanning in the

ID label edit (CH) function. Current generation Tac/Com II software supports three scan

modes as follows:

3.9.1.1

LIST Scanning

Channels are selected for LIST scanning by adding a scan flag (^S) to the end of the ID

line when in the channel editing mode. This space can be toggled to be either a dash

(not flagged), or the (^S) flag, showing that the channel is added to the scan list for that

radio, or block of 32 channels (NT-series radios).

Once scanning is active, the control will move through all the flagged channels in order

until a carrier is detected, then it will remain on that channel until traffic stops, plus a 2-3

second latency period to permit a reply to any incoming traffic. If there is no further

activity, the control will continue through the list, and then start over. When scanning is

de-selected, the control head resumes normal operation and the radio will return to the

'home' or monitor channel it was set to before scanning began.

3.9.1.2

PRIORITY Scanning

Because they can exist only once for each radio or block of 32 channels (NT-series

radios), and to avoid accidental duplication, priority channels are set via the status edit

function. The same priority channels could be set for every block (NT-series radios),

but they must then be entered into channels within each block. The highest priority

channel is designated P1, and the next priority P2; the lowest priority is the 'home' or

monitor channel. The

flags will appear after the channel names in the ID mode,

once they are set. It is not necessary to have both P1 and P2 assigned, if they are not

required.

If a transmission is received on the 'home' channel, both P1 and P2 continue to be

checked. If a transmission occurs on the P2 channel, the radio will continue to check for

activity on P1. If a transmission occurs on the designated P1 channel, the radio will

rechannel to that frequency, regardless of activity on other channels. The check during

priority is very fast, about every 1/3 second, and will sound like a faint tick when

occurring during other reception. Whenever an incoming transmission is detected, the

display will show the correct channel data corresponding to the display mode selected

('ID', 'RX' or 'TX').

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3.9.1.3 LIST+PRIORITY Scanning

SM06 Rev. 4.10

In this mode, both LIST & PRIORITY features are combined, so that a list can be

checked while still periodically testing for activity on two priority channels. This is a new

feature and only exists on software revisions 2.13 and later for Tac/Com II, and 1.45

and later for Tac/Com I controls. In this case, priority allocations remain per the normal

priority mode, but list channels have a lower priority than the 'home' channel, and are

scanned only when there is not any activity on the other three.

Note for NTX Transceivers:

When CTCSS tones are enabled, the access time for the decoder is added to the LIST

+ PRIORITY scanning time, dramatically reducing receive audio intelligibility. NAT

therefore recommends that the combination of CTCSS tones and LIST + PRIORITY

scan should be avoided for these units.

3.9.1.4

AM Scanning

While this was not an original feature of Tac/Com and the NT136-PAS multi-mode

transceiver, it is now fully implemented. Some hardware updates are required to the

transceiver (below s/n 1018) to achieve the required sensitivity for fast-lock AM

reception, but coupled with current software, it can provide scanning with AM levels

down to 2.0 uV. Because of the electrically noisy environment aircraft present, squelch

thresholds must be much higher for AM receivers than for FM (2-3.0 uV versus 0.5 uV).

When scanning, the effective range of coverage will be smaller for AM than for FM

signals of the same strength.

3.9.1.5

Scanning on other systems

On Midland Syn-Tech I radios, channels added to the scan list will have the letters 'a' or

'b' added to the end of the ID label display. The status line is used to select whether list

'b' or both list 'a' and 'b' are used in the SCAN mode. Only list 'a' channels are used in

the priority mode. Scanning is not provided for Wulfsberg radios due to their very long

synthesizer lock up times, which preclude scanning.

3.10

NAT NTX138 Wide-band/Narrow-band Operation

The NAT NTX138 radios are capable of operating in either a wideband mode (5.0 kHz

modulation) or narrowband (2.5 kHz modulation) mode. These modes are largely

determined by the operating system used by the radio, and the associated channel

spacing.

See section 3.7.1 for wide/narrow band display indication.

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3.11 Master Edit Mode

USE THIS MODE WITH GREAT CARE.

Tac/Com Control Head Manual

SERIOUS PROBLEMS CAN DEVELOP IF THIS MODE IS USED INCORRECTLY,

RESULTING IN SEVERE CHANNELING DIFFICULTY.

This mode is intended for service related activities, but is presented here briefly for

reference, and to aid with any field related data problems. Normally, there is no reason

to ever enter this mode unless it is necessary to change a frequency display for some

non-agile channel, such as a guard.

Note: Master Edit Mode is seldom used in normal operation.

If the data in the control head has developed an error that cannot be edited out, this

mode will correct these problems. Such problems may be:

Garbled or incorrect channel number, or out of sequence numbers.

Mystery characters in a space that can't be reached for edit.

Incorrect guard or crystal channel data.

3.11.1

Entering Master Edit Mode

To enter this mode, carry out the following steps, EXACTLY AS DESCRIBED:

Turn on the control head.

Press the RADIO button to activate a radio.

Move the EDIT switch to CH. The editing cursor will flash after the channel label

and tones on/off indicator.

Push the HELP button to bring up the HELP function.

Advance through screens by pressing HELP until the Enter applicable password

appears.

Using the CHAN switch scroll to N.

Press the NEXT Button.

ii)

iii)

iv)

vi)

Using the CHAN switch scroll to A.

Press the NEXT Button.

Using the CHAN switch scroll to T.

Press the NEXT Button.

If the password is entered correctly, the control will say Correct. If not, the

control head will drop back into normal operation. Press NEXT again, and the

regular data screen will appear, but the editing cursor will be in the left-hand

position after the arrow.

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Anything visible on the screen may now be edited, SO BE CAREFUL!!! If channel

numbers are being changed, be sure that they are CORRECT! A mistake here can be

very difficult to correct later.

IMPORTANT!

This mode stays active until the unit is powered down, and is active for ALL RADIOS,

not just the one initially selected. Anything that needs to be changed may be fixed,

but be sure to power the unit OFF before normal operation.

If you are unsure of this function, PLEASE CALL NAT for more information!

3.11.2 How Data is Stored in the Control Head

In current generation Tac/Com I and II controls, all detailed radio configuration data is

stored in special software set-up routines, to make field changes much simpler.

The over-all operating software for the control head is stored in an EPROM (Erasable

Programmable Read Only Memory), which is an integrated circuit storage device, and

can be removed and updated through a service centre exchange.

These program updates come only from NAT itself. Some control head data, such as

set-up information, channel labels and frequencies, are stored in EEPROM (Electrically

Erasable Programmable Read-Only Memory) circuits and can be accessed and

updated by the user/operator as required.

3.11. 3

Editing Considerations

It is important to remember that data stored in the EEPROM can be damaged by

catastrophic component failure, severe static discharge (particularly by friction induced

static during shipping if incorrectly packed), or accidental servicing or installation errors.

If odd or un-removable characters should appear in the display, particularly in

unfortunate locations such as channel numbers, they can be removed via the 'MASTER

EDIT' mode.

Channels should be set up in terms of easy scrolling access, with the most often used

being close together in numerical sequence. This will save endless cycling back and

forth, looking for channels.

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3.12 Installation & Configuration Mode

Tac/Com Control Head Manual

This mode of operation is also not required for normal operation and is intended to aid

in servicing and control head set-up. Some firmware functions of the control head can

be set via this mode, including the following installation parameters:

-Transceiver selection for each interface slot.

-Transceiver selection for Wulfsberg C-1000 system emulation operation

(RT-406F-SYS or RT-450-SYS)

-Number of radios installed in the control head.

-Number of channels per radio.

-Master/Slave operation.

-DPL enable (this function is normally set OFF, to avoid tone confusion).

To enter this mode requires a special code, and switch sequence and should be USED

ONLY AT THE FACTORY OR BY QUALIFIED SERVICE PERSONNEL. It is possible

to completely DISABLE the control head by incorrect settings in this mode, so

considerable care is required.

3.12.1

Entering Configuration Mode

WARNING!

Incorrect Use Of This Mode May Render The Control Head INOPERABLE!

Use This Function With Extreme Care.

If you have ANY questions, please phone NAT prior to use.

To enter this mode do the following, EXACTLY AS DESCRIBED:

With the power turned off, move the EDIT switch to the CH position.

Turn on the control head. The '(Lock) EDIT switch OFF for normal operation.'

message should appear.

Press the HELP button. The '...password:' message should appear.

Using the CHAN switch scroll to I.

Press the NEXT Button.

ii)

iii)

iv)

vi)

Using the CHAN switch scroll to A.

Press the NEXT Button.

Using the CHAN switch scroll to C.

Press the NEXT Button.

Push HELP to advance to the first configuration screen. Depending on the style

of control head, and the options selected, the information on this and subsequent

screens will vary. So don't worry if you don't see all of the features listed in the

following table.

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Using the normal editing procedure (SELECT/NEXT), select a valid option for

each feature presented. The configuration mode may not be left until all options

are completed.

It is up to you to ensure that the selected options are compatible with each other

and with the hardware being used. If they are not, the control head may not

operate correctly. Read the following table carefully to ensure that you

understand the configuration options completely.

3.12.2

Configuration Option Table

FEATURE

VALID OPTIONS

COMMENTS

S/W VER.*

# OF RADIOS

2,3,4

This is the maximum number of radios the

control head can handle, not the number

installed.

2.00

DIGITAL GRD

DPL CODES

Controls the Digital Channel Guard option for all

NT-series radios installed. (Digital Channel Guard

is also known as Digital Private Line or DPL)

Determines whether this control head will act as

a master in a master/slave setup. Normally OFF.

Set to the # of slaves that are connected to this

master control head. This feature supersedes

the MASTER C/H feature.

Determines whether or not the radio status lines

are displayed on power-up.

Determines whether or not the help information

option is displayed on power-up.

ON,OFF

2.00

MASTER C/H

# OF SLAVES

0,1,2

2.26

2.20

2.47

STATUS DISPLAY

ON POWER-UP

HELP DISPLAY ON

POWER-UP

ON,OFF

Set to the serial port that the master control

head's Data Entry Pad is connected to. Set to 0 if

you do not have a Data Entry Pad. Port A is on

the main system connector. Ports B and C are

on the optional auxiliary serial I/O board

connector.

2.26

DATA PAD PORT

0,A,B,C

RT-9600, RT-7200,

RT-30, RT-138, RT-450, Selects the radio type for each slot.

450-SYS, RT-406, 406-

SYS, NT30A,

Make sure that the radio type selected matches

the interface board installed in that slot.

NT30B, NT136, NT150, The 450-SYS and 406-SYS options simulate the

RADIO

NT403, NT450, NT450A, C-1000 control head

2.00

NT450B, NT450C, NT806, (with an RT-450 or RT-406F as the UHF RT).

FF-40,

SYN I, SYN XTR,

2x5,2x5 EXT,PAR BCD,

805-1,

SPEC L, SPEC L1,

SPEC L2, ASTRO,

NTX138, NTX066,

NTX403

SPEC = SPECTRA, L indicates a standard radio,

L1 indicates control set up with a ‘Zone’ switch,

L2 is Reserved (S/W Ver. 2.44)

Page 3-32

Jan 4, 2006

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SM06 Rev. 4.10

Tac/Com Control Head Manual

FEATURE

VALID OPTIONS

COMMENTS

S/W VER.*

The number of channels available for each radio.

Does NOT include guard channels.

Ensure that the number of channels is valid for

the radio-type selected as follows:

RT9600/7200 - any up to and including 126

FLEXCOMM - any up to and including 127

CHANS. INST.

6, 12, 16, 22, 32, 64, 80, FLEXCOMM SYSTEM - any up to and incl. 125

96, 99, 100, 125, 126,

127, 128

NT SERIES - 32,64,96,128

FF40 - 6,12,16

SYNTECH I - 80

SYNTECH XTR - 100

ARINC 2x5 and PARALLEL BCD - any

805-1 - 99

ASTRO, SPECTRA - any

NTX138, NTX066, NTX403 - any

Set to 8 if using the internal RT9600/7200 tones.

Set to 32 if using the internal TAC/COM tones.

Set to NONE if there is no RT9600/7200 guard

receiver installed.

Set to ST-ED if using the Status Edit mode to

control the RT9600/7200 guards. ST-ED option

is invalid if 'RT9600 TONES' is set to 32.

Set to F/P if using the extra TAC/COM Front

Panel controls to control the RT9600/7200

guards.

**RT9600 TONES

**RT9600 GRD

8, 32

2.20

NONE, ST-ED, F/P

**NTX MODE

FM ONLY/FM & AM

P/BW

Allows selection of modulation type

applicable to NTX138-300 only)

Allows selection of either Transmit Power control

or Bandwidth control

(AM

2.47

**RT9600 P/BW

This line will appear once for each NT-series

radio that is installed. Set to YES for each radio

that has a guard receiver installed.

This line will appear once for each NT136-type

radio that is installed. Set to FM ONLY for a

standard NT136 radio. Set to AM/FM for an

NT136-PAS radio.

This line will appear once for each SPECTRA-

type radio that is installed. These selections

indicate the source of the Labels (LBL)

displayed, either from the Control Head or the

Spectra radio.

**NT GRD INST

**NT136

YES, NO

2.21

2.22

2.44

FM ONLY, AM/FM

C/H, SPECTRA

**CHAN LBL

** ASTRO TYPE

W4, W5, W7, W9

This line will appear once for each ASTRO-type

radio that is installed. These select the type of

Astro control head for which the T99 Astro radio

has been configured.

2.52

Note: For the XTL series, W9 MUST be selected

for proper operation

Software version in which the feature was introduced.

Except where otherwise noted, all later versions also include the feature.

** These will appear only if the radio has been selected in the ‘RADIO’ box of the Feature column.

End of section 3

Jan 4, 2006

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ENG-FORM: 806-0106.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

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