Telex
Operating Instructions
TM
RadioCom
Wireless IFB
TT-16
16 Channel Transmitter
TR-16
16 Channel Receiver
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Whenever the system is in use, the transmitter
should be left on to prevent the receiver from pick-
ing up outside interference.
OFTEN ASKED QUESTIONS
Question: Can more than one system be used si-
multaneously?
Question: What is E.D.R.?
Answer: Yes but never on the same frequency. You
will need to have different frequencies for every re-
ceiver/transmitter combination.
Answer: E.D.R. stands for enhanced Dynamic
Range (companded) audio. E.D.R. improves the sig-
nal-to-noise ratio providing much better audio qual-
ity.
Question: Is the system more sensitive in any one
particular direction?
Question: Can the TT-16 and TR-16 be used with
existing TR-34 and TT-44 products.
Answer: No, the transmitter’s antenna radiates
equally in all directions, but the signal is attenuated
by your body, walls or other surrounding objects.
The receiving antenna is essentially sensitive in all
directions as well.
Answer: Yes, as long as the E.D.R. feature is dis-
abled on the TT-16 and TR-16.
AVAILABLE FREQUENCIES
Channel
Freq. in MHz
Broadcast TV
Channel
Question: Can the receiver receive other transmis-
1
2
64.5
64.7
64.9
65.1
65.3
65.5
65.7
65.9
66.1
66.3
66.5
66.7
66.9
67.1
67.3
67.5
3
3
3
3
3
3
3
3
4
4
4
4
4
4
4
4
sions when the transmitter is turned off?
Answer: Yes it can. Telex systems operate in the
VHF Band between 64-68 MHz. However, it is not
susceptible to radio wave skip, CB’ers or standard
FM radio transmissions. It is on TV Broadcast chan-
nels 3 and 4. So it is best to use the channels in
your system that are not on the TV broadcast chan-
nel in your area. See Table 1.
3
4
5
6
7
8
The frequency your system operates on is computer
selected for least interference, but there is no such
thing as a 100% clear channel all the time.
A
B
C
D
E
F
G
H
If the system is going to be used in a permanent
fixed location, it should operate interference free un-
til such a time or date when someone else begins
using the same frequency.
If the system is going to be moving among various
locations, you may run into occasional frequency
conflicts.
Table 1
Frequencies Available
-2-
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Treble Control: A push button treble control is pro-
vided to enhance higher frequency audio when the
button is engaged, indicated by .
TR-16 SYNTHESIZED
RECEIVER
General Description TR-16
Headphone Jack: The receiver jack accepts a
0.140-inch (3.5 mm) diameter miniature plug. A va-
riety of earsets or headphones can be plugged into
this jack for listening.
The Telex TR-16 Receiver is a component of a sys-
tem which operates on sixteen (16) user selectable
channels in the 64 to 68 MHz frequency band. The
receivers are designed to be used with the Telex
TT-16 Transmitter.
Belt Clip: The belt clip supplied is detachable by
spreading the wire apart at the tops and removing
one side of the clip form the case and then the other.
Operating Features
Volume OFF/ON Control: This thumbwheel con-
trol serves as both an off/on switch and as a volume
control. The receiver is turned off when the control
is in the extreme counter-clockwise position, when
viewed from the rear, and the volume is loudest
when the control is in the extreme clockwise posi-
tion.
BELT CLIP
TELEX COMMUNICATIONS, INC.
MODEL TR-16
IC: 1321A-TR16
This device complies with part 15 of the FCC rules. Operation
is subject to the following two conditions: (1) This device may
not cause harmful interference, and (2) this device must accept
any interference received, including interference that may cause
undesired operation.
SET
SWITCH
BUTTON
Made in U.S.A.
S.N.: 1001
BATTERY
TREBLE CONTROL
HEADPHONE JACK
COMPARTMENT
SET
E.D.R.
VOLUME OFF/ON CONTROL
BELT CLIP
BATTERY
ORIENTATION
BATTERY COMPARTMENT COVER
Figure 3
Operating Features TR-16
-3-
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SPECIFICATIONS
TR-16 16 Channel Synthesized Receiver
Temperature Range....................................................................32 to 122 degrees F/0 to +50 degrees C
Supply Voltage ...............................................................................................2-3 Volts, (2) AA Batteries
Battery Life....................................................................................................................20 Hrs - Alkaline
16 Hrs - NimH
8 Hrs - NiCad
Frequency Response....................................................................................................100-10 kHz ±3 dB
Sensitivity (12 dB SINAD @ 66.1 MHz)................................................................................1µ V max.
Distortion...............................................................................................................................less than 2%
Audio Output @ 10% Distortion
Battery Input
Voltage
8 ohm
15 mW
80 mW
32 ohm
10 mW
50 mW
2.0 V
3.0 V
Controls and Connections.................................................................................Volume OFF/ON Switch;
Treble Control Switch; Channel Selection Switch
Audio Output Jack
TT-16 SYNTHESIZED
TRANSMITTER
General Description
The Telex TT-16 is a base station transmitter which
operates in the 64-68 MHz band and accepts a wide
range of audio input levels.
Operating Features
TT-16 Front Panel
1. Power Button (Must be held in for 1
1
6
second to turn off.)
2. Headphone volume adjustment
3. Headphone Monitoring Jack
4. SET Button
Telex
Monitor
RadioCom
power
set
TT-16
WIRELESS IFB TRANSMITTER
5. Back Lit LCD Display
6. UP and DOWN Adjustment Buttons
4
2 3
5
Figure 4a
Operating Features TT-16 Front Panel
-4-
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TT-16 Rear Panel
1. XLR Input Connector: Accepts bal-
anced two wire Telex, RTS channel
1 or RTS channel 2. NOTE: RTS
channel 2 is compatible with
*Clear-Com® Intercom Systems.
Balanced
Audio
INPUT
PINS
1-2
1-3
2-3
Antenna
TM
RadioCom
RTS 1
RTS 2
TELEX
12-15V
AC/DC
Unbalanced
Audio
2. Unbalanced Audio ¼" Input Con-
nector.
TT-16
WIRELESS IFB TRANSMITTER
FCC ID: B5DM524
IC: 1321A-TT16
S.N.: XXXXXX
Telex Communications, Inc. Made in USA
P/N: 804182
Telex Communications, Inc.
Made in U.S.A.
3. Antenna Jack: Accepts telescoping
antenna (supplied).
4. Power Input Jack: Accepts any
source of 12-15 VAC/DC 300 mA
minimum.
1
2
3
4
Figure 4b
Operating Features TT-16 Rear Panel
9
1
5
RF POWER: HIGH
8
CHANNEL
UNBALANCED
-30dB
+3 +6
-10
0
-5
AUDIO LEVEL
6
7
BALANCED
AUDIO LEVEL -36dB
2
AUDIO LEVEL
RTS 1 RTS 2 TELEX
65.9
EDR
MHz
FREQ.
8
4
3
1. Channel Indicator
2. Audio Input Meter
3. Frequency Indicator
4. Enhanced Dynamic Range Indicator
6. Unbalanced Audio Level
7. Balanced Audio Level
8. Balanced Input Selection for RTS 1,
RTS 2, Telex
9. Lock Out Indicator
5. RF Transmit Power (High when lit,
Norm when not)
Figure 5
LCD Display Functions
*Clear-Com® is a registered trademark of
Clear-Com Intercom Systems, Inc.
-5-
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TT-16 Specifications
Audio Input: Female XLR
RTS 1 Selected........................................................................Line impedance 200 W / Level adjustable
RTS 2 Selected........................................................................Line impedance 200 W / Level adjustable
Telex Selected.........................................................................Line impedance 300 W / Level adjustable
Unbalanced Audio Input ..................................10K W input impedance/10 mV-1.0 VRMS input range
RF Power Switch.......................................................................50mW in “Hi”, approx. 5mW in “Low”
AGC Range ......................................................................................................................................30 dB
Signal-to-noise Ratio:
Normal..........................................................................................................................................58 dB
EDR Enabled................................................................................................................................77 dB
Pre-Emphasis....................................................................................................................................115mS
Maximum Deviation.....................................................................................................................±25 kHz
Frequency Control Crystal.........................................................................................+/-.005% tolerance
Available Frequencies ................................................................................................See Table 1, page 2
Max. Transmitter Output Power ....................................................................................................50 mW
Power Requirements ................................................................................12-15V, AC or DC @ 300 mA
Dimensions...................................................................................................7 ½"W x 1 3/4"H x 6 7/8"D
FCC ID......................................................................................................................................B5DM524
EQUIPMENT SET-UP AND OPERATION
TT-16 SYNTHESIZED
TRANSMITTER
UNPACKING: Unpack your Wireless IFB system. If
there are any damages or shortages, refer to the "War-
ranty Service Information" card.
ANTENNA
TT-16 TRANSMITTER LOCATION: Select a suit-
able location for the TT-16 Transmitter. Try to keep a
clear, unobstructed path between the transmitter and
receiver and allow plenty of free space around the
transmitter antenna.
REAR PANEL
ANTENNA CONNECTIONS: Connect the tele-
scoping antenna to the rear panel ANTENNA jack.
Figure 6
Antenna Connection
For best results, the antenna should be vertically
aligned. Tighten the knurled ring to hold the antenna
in place, and extend the antenna to full length.
POWER CONNECTION: Plug the AC power
adapter into an electrical outlet. Plug the other end
of the cord into the power input jack on the rear
panel of the TT-16.
-6-
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should be used for small to medium sized venues
and whenever multiple systems are being used. Press
SET when the power is set and the Unbalanced In-
put level will flash.
Antenna
12-15V
AC/DC
-
+
Unbalanced Input And Level Adjustment
If the unbalanced audio input will not be used, with
the "Unbalanced Audio Level" flashing use the
DOWN button to set the level to OFF and press set
to go to Balance Input Selection.
Figure 7
Connecting Power
If the Unbalanced input will be used, connect the in-
put now and apply audio content. With the audio
content playing and "Unbalanced Audio Level"
flashing, watch the audio meter. The peak signal
should not go above the 0 dB segment, use the UP
and DOWN buttons to adjust the input level so that
the loudest input lights up the 0 dB segment. When
the level is set, press the SET button and one of the
input options will flash.
SYSTEM SET UP
All of the channel and input selection functions are
accessed from the front panel. Press SET button
once to begin System Setup. Whenever a function is
flashing, the UP and DOWN buttons can be used to
adjust it. Once set, the next function will start to
flash. To access a specific function, press SET until
the function is flashing, the features are accessed in
the following order:
Balanced Intercom Input and Level Adjustment
Channel
With the Balanced Intercom Input selection flashing
(RTS1, RTS2, or TELEX). Use the UP and DOWN
buttons to scroll to the correct input. With the cor-
rect input displayed, press SET and the "Balanced
Audio Level" indicator will flash.
RF Power Output
Unbalanced Level Adjust
Balanced Input (RTS1/RTS2/Telex)
Balanced Level Adjust
If the intercom audio input will not be used, with
one of the Balanced Input options flashing press
SET so the "Balanced Audio Level" is flashing.
Use the DOWN button to set the level to OFF and
press SET to end the setup session. When OFF is
selected "Balanced Audio Level" will not be dis-
played on the screen.
Channel Selection
Turn the TT-16 on by touching the POWER button.
(The TT-16 is designed to return to "on" if power is
disconnected while the unit is on. This is so the unit
can be switched on and off with a power strip or
rack power).
The LCD display will light up and show the Chan-
nel, Audio Meter, Frequency (and E.D.R. if it has
been enabled). Press the SET button once and Chan-
nel letter will flash. Use the UP and DOWN Arrow
buttons to select the desired channel 1-9 and A-H.
Press SET when the desired channel is displayed
and the channel is set. The channel letter will stop
flashing and the RF Power indicator will flash.
If the Balanced Input Selection will be used, then
connect the input and apply audio content. With the
audio content playing and "Balanced Audio Level"
flashing, watch the audio meter. The peak signal
should not go above the 0 dB segment, use the UP
and DOWN buttons to adjust the input level so that
the loudest input lights up the 0 dB segment. When
the level is set, press the SET button and the Setup
Session will end.
RF Power Selection
NOTE: The TT-16 will operate with both Unbal-
anced and Balanced inputs active at the same time.
While the "RF Power" indicator is flashing, press
the UP ARROW for HIGH and DOWN for NORM
(the "RF Power" line will flash quickly and will
disappear when SET is pressed). NORM power
-7-
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Enhanced Dynamic Range (E.D.R.) Operation
MULTIPLE SYSTEM INSTALLATIONS: As
with any radio device, interference can occur at any
time. The frequencies offered are shared with other
legitimate users. The severity of interference varies
with the distance to the interfering station. Multiple
systems further complicate installations. The follow-
ing steps are suggested in order to achieve best re-
sults in your installation.
The Telex TT-16 Transmitter is equipped with
E.D.R., Enhanced Dynamic Range (companded) au-
dio. This mode greatly improves the Audio Signal to
Noise Ratio when used with the Telex Model TR-16
receiver. The E.D.R. mode must be selected on both
the transmitter and receiver to be effective. If using
the TT-16 with TR-34 IFB units, E.D.R. must be
turned off.
1. In order to determine whether your selected fre-
quencies have minimum interference, Telex rec-
ommends that you first temporarily install the
receivers in your proposed setting and monitor
the channel for interference. To do this (with
fresh batteries installed) turn on your receiver,
but DO NOT turn on any other receiver or trans-
mitter at this time. If audible interference is pres-
ent, this may indicate another user on the
channel. Monitoring should be repeated for each
channel that you propose to use. DO NOT use
channels that have interference.
1) To engage the E.D.R. function, turn the TT-16 off
with the power switch. (The power switch must
be held for 1 second to turn unit off.)
2) Press and hold the SET button while you turn the
TT-16 back on. The E.D.R. symbol will be dis-
played in the lower right corner to indicate the
mode is active.
3) Repeat the procedure to disable the E.D.R func-
tion.
Lock Out
The TT-16 SET button can be locked to prevent
E.D.R. activation, and unintended channel changes.
2. Set your transmitter(s) to channels with no or
minimum interference. Each transmitter must be
set to a separate frequency. For best results when
using multiple transmitters, each transmitter
should be installed separately as far as possible
from the others.
1) To engage the Lock Out Feature, press the UP
and DOWN buttons at the same time and hold
them down for two seconds.
2) The padlock symbol will appear and the set but-
ton is disabled.
3. Turn on the transmitter(s) with an active audio
input. Test walk a receiver through the expected
listening area to verify coverage. The system
should now be ready for use.
3) To unlock the system, press the UP and DOWN
buttons and hold them for two seconds or until
the padlock symbol disappears.
Audio Monitor
Turn the Monitor (volume) control all the way down
(counterclockwise). After the audio input levels
have been adjusted, Stereo headphones with a 3.5
mm or ¼ in. plug can be plugged into the Monitor
jack. If you wish to monitor the audio program ma-
terial, turn up the monitor (volume) control to the
desired level. The monitor control does not affect
the transmitted audio level.
-8-
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1) To engage the E.D.R function turn the TR-16 off
with the volume control thumb wheel.
TR-16 SYNTHESIZED
RECEIVER
2) Press and hold the SET button while you turn the
TR-16 back on. The E.D.R. symbol will be dis-
played in the lower right corner to indicate the
mode is active.
Keep a clear, unobstructed path between the trans-
mitter and receiver antennas for a clear transmis-
sion.
3) Repeat the procedure to disable the E.D.R. func-
tion.
2
1
Lock Out
The TR-16 SET button can be locked to prevent
E.D.R. activation, and unintended channel changes.
The High Frequency Emphasis button will remain
active at all times for the convenience of the user.
3
E.D.R.
1) To engage the Lock Out Feature, press the SET
and buttons at the same time and hold them
down for 5 seconds.
4
1. Channel Display 1-9 through A-H and low battery
2) The padlock symbol will appear and the set but-
ton is disabled.
indicator
2. Lock Indicator (see Change Lock Out)
3) To unlock the system, press the SET and but-
tons and hold them for 5 seconds or until the
padlock symbol disappears.
3. High Frequency Emphasis Indicator (on when
symbol is showing)
4. Enhanced Dynamic Range Indicator.
Figure 8
TR-16 Display
SET
SWITCH
BUTTON
Channel Selection
TREBLE CONTROL
HEADPHONE JACK
1) Turn the receiver on. A channel letter will show
in the display.
SET
2) Press the SET button once and the Channel indi-
cator will flash.
E.D.R.
3) Press the
button and the Channel will scroll
VOLUME OFF/ON CONTROL
up, match the channel to the transmitter channel
being used (TT-16, TT-44).
4) Press SET, the channel indicator will stop flash-
ing and the channel is set.
Enhanced Dynamic Range (E.D.R.) Operation
The Telex TT-16 transmitter is equipped with
E.D.R., Enhanced Dynamic Range (companded) au-
dio. This mode greatly improves the Audio Signal to
Noise Ratio when used with the Telex Model TR-16
receiver. The E.D.R. mode must be selected on both
the transmitter and receiver to be effective. If using
the TR-16 with a TT-44 IFB Transmitter, E.D.R.
must be turned off.
-9-
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Low Battery Indication
1) When there is approximately 10% of the battery
life left, an animated battery symbol will flash al-
ternately with the channel letter in the LCD dis-
play.
2) When there is only 5% battery life left, the bat-
tery symbol will constantly flash in the display.
E.D.R.
Low Battery Display
BATTERY REPLACEMENT
The TR-16 Receiver uses two (2) AA batteries.
When the batteries are low the sound will be dis-
torted. Replace weak batteries with two fresh AA
batteries, and position them in the battery compart-
ment as illustrated in Figure 9.
For additional information refer to the “Battery In-
formation” Section.
NOTE: If the unit is to be stored for any length of
time make sure you remove the batteries from the
unit.
BELT CLIP
BATTERY
ORIENTATION
BATTERY COMPARTMENT COVER
Figure 9
Battery Installation - TR-16
-10-
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BATTERY INFORMATION
General
Alkaline Batteries
Improper battery selection, use, installation and care
are the cause of numerous wireless system failures.
Alkaline batteries such as Mallory’s DURACELL®
or Eveready’s ENERGIZER® provide the most reli-
able operation in wireless transmitters and receivers.
The use of low cost carbon-zinc batteries is NOT
RECOMMENDED.
*ENERGIZER® is a registered trademark of Union
Carbide
Corporation.
*DURACELL® is a registered trademark of
Duracell Inc.
ANTENNA INFORMATION
Antenna Alignment
Antenna Placement
Proper antenna placement probably has the most ef-
fect on your TELEX Wireless System’s overall per-
formance. Following the suggestions that follow
should result in “dropout free” performance.
Balanced
Audio
Balanced
Audio
INPUT PINS
INPUT PINS
T
M
TM
RadioCom
TT-16
Antenna
RadioCom
TT-16
RTS CH1 1-2
RTS CH2 1-3
Unbalanced
Audio
12-15V
AC/DC
RTS CH1 1-2
RTS CH2 1-3
Unbalanced
Audio
12-15V
AC/DC
TELEX
2-3
TELEX
2-3
WIRELESS IFB TRANSMITTER
FCC ID: B5DM524
WIRELESS IFB TRANSMITTER
FCC ID: B5DM524
IC: 1321A-TT16
IC: 1321A-TT16
S.N.: XXXXXX
S.N.: XXXXXX
Telex Communications, Inc. Made in USA
P/N: 804182
Telex Communications, Inc. Made in USA
P/N: 804182
Telex Communications, Inc.
Made in U.S.A.
Telex Communications, Inc.
Made in U.S.A.
Telex
Monitor
RadioCom
power
set
TT-16
WIRELESS IFB TRANSMITTER
Figure 10
Telex
Monitor
RadioCom
power
set
TT-16
WIRELESS IFB TRANSMITTER
Antenna Alignment
Good and Bad
Figure 11
Distance Between Transmitter and Receiver
Keep the distance between the transmitter and the
receiver(s) as short as possible. The greater the dis-
tance the weaker the signal.
-11-
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Make sure the “signal path” between the transmitter
and receiver(s) is unobstructed. You should always
be able to visually locate the antenna of the trans-
mitter at all times.
DO NOT - Mount the transmitter on, or next to,
metal such as beams, walls with metal studs, etc.
This will “detune” the transmitter antenna which
can result in loss of signal at the receiver.
LOCATION
IS OK
RadioComTM
power
set
Telex
Monitor
TT-16
WIRELESS IFB TRANSMITTER
LOCATION
IS BAD
Telex
RadioComTM
power
set
Telex
Monitor
TT-16
WIRELESS IFB TRANSMITTER
Telex
Monitor
RadioCom
power
TT-16
set
WIRELESS IFB TRANSMITTER
SIGNAL REACHES ANTENNA AT FULL STRENGTH WITH NO OB-
STRUCTIONS.
Figure 12
Keeping Site Clear to Antenna
Figure 14
Transmitter Antenna Placement
Attempting to operate the sound enhancement sys-
tem through or around walls, ceilings, metal objects,
etc., will reduce system range and performance.
Telex
RadioCom
power
Monitor
TT-16
set
WIRELESS IFB TRANSMITTER
SIGNAL REFLECTION OFF A METAL OBSTRUCTION CAUSES
REDUCED SIGNAL AND “MULTIPATH”
Figure 13
Operating Through Obstruction
-12-
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TROUBLESHOOTING
Reread the sections of this manual to make sure you
have completed system set-up properly.
If you are unable to solve the problem, contact the
dealer from whom you purchased the system for as-
sistance.
PROBLEM
SOLUTION
Reduce audio gain on transmitter by adjusting
the gain controls.
DISTORTION -System's audio quality seems
distorted at medium to high input levels
Check the gain settings on the transmitter and
the volume control on the receiver. They may
be too low.
HISS - System seems to produce a "hiss" which
is undesirable.
Make sure the antenna is connected and fully
extended. Follow the location suggestions on
page 15. Change the location of the transmitter
antenna or avoid the bad area with the receivers.
DROPOUTS - When moving around the area
in which you will be using the system there
seem to be locations where the signal
"swooshes" or completely disappears.
Make sure the Telex TT-16 is turned on - this
will usually eliminate the interference signal.
INTERFERENCE - System picks up signals
other than the TT-16 Transmitter.
If problem persist with the transmitter "ON", try
changing to another channel.
Receiver Battery is possibly in need of replace-
ment. Transmitter antenna possible located in-
correctly. Receiver not tuned properly.
REDUCED DISTANCE - System doesn't oper-
ate as far as it once did. System doesn't' operate
as well as you think it should.
If using "throw away" batteries make sure they
are alkaline. If using nickel-cadmium or nickel
metal hydride batteries make sure they were
fully charged when yo are using them and fully
drained when you are done before recharging
them.
BATTERIES DON'T LAST
Locate Transmitter away from the audio equip-
ment.
HUM - Audio System emits hum or buzz thru
speakers and sound enhancement receiver.
Transmission sounds compressed on TR-16
E.D.R. function may be engaged on the TT-16.
See setting E.D.R. function on page 9. The
E.D.R. feature can only be used with the TR-16
and must be active on both transmitter and re-
ceiver to be effective.
SET button does not work, cannot change chan-
nel
Lock Out is engaged, press and hold UP and
DOWN buttons until the padlock symbol disap-
pears.
-13-
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FCC INFORMATION
The Telex TR-16 receiver is authorized under part 15 of the FCC Regulations. Changes or modifica-
tions to this equipment could void the user’s authority to operate the equipment.
The Telex Model TT-16 transmitter is authorized under Federal Communications Commission and
Industry Canada Rules. Licensing of the Transmitter, if required, is the users responsibility and
licensability depends upon the users classification, and frequency selected.
CAUTION: Changes or modifications made by the user could void the user's authority to operate the
equipment.
Operation is subject to the following two conditions: (1) This device may not cause interference, and
(2) This device must accept any interference, including interference that may cause undesired opera-
tion of the device.
ACCESSORIES
CES-2 complete TeleThin® Announcer Earset.........................................................................800318000
(incluces TRV-04 125 ohm TeleThin® Receiver, CMT-98 5ft TeleThin®
Grey cordset and ET-4 Coiled Eartube)
SEB-1 Single Earbud with Cord ..................................................................................................59840005
DEB-2 Dual Earbud with Cord....................................................................................................59840001
HED-2 Collapsible Lightweight Headphone...............................................................................59840007
HED-3 Full Cushion Noise Reduction Headphone.....................................................................63510021
TW-A 1/4 Wave Telescoping Antenna for TT-16 ...........................................................................877960
PA-2 USA Power Supply for TT-16 ................................................................................................730139
RM-S Single Rack Mount for TT-16..........................................................................................71081001
RM-D Dual Rack Mount for TT-16.............................................................................................71081002
TR-16 Belt Clip ................................................................................................................................358815
-14-
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TELEX COMMUNICATIONS, INC. 12000 Portland Ave. South, Burnsville, MN 55337,U.S.A.
PN 804184 Rev. B
AUG 2005
Made in U.S.A.
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