SIGMA
STAND ALONE NTSC BLACK SIGNAL
GENERATOR
BSG26N
OPERATOR'S MANUAL
P.O. BOX 448
1027 COMMERCIAL AVENUE
EAST PETERSBURG, PA 17520-0448
(717) 569-2681
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SIGMA ELECTRONICS, INC.
BSG-26 SERIES
INSTRUCTION MANUAL
WARNING: To reduce the risk of fire or electric shock, do not
expose this apparatus to rain or moisture.
GENERAL:
The BSG-26N and BSG-26P are Black Signal Generators which provide six (6) blackburst signal outputs. The
outputs are driven from the same internal source to ensure system synchronization. The design of the units provides
suitable operation for applications from complex total system timing to laying black on tape. The blackburst signal is
digitally derived from a temperature compensated oscillator. These units provide a stable output and do not require
any adjustments during operation. The outputs are present when power is applied.
Superblack operation is selective via J1. With J1 jumper shorted across pins 1 and 2, the module will produce
superblack on all outputs. Superblack can be used when building a Multi-Pass special effect. The superblack signal,
approximately -7.5 IRE, provides a noiseless background that can be laid down on the tape for this application.
The BSG-26N, NTSC version, provides outputs per RS-170A / SMPTE 170M standards. The BSG-26P, PAL
version, provides outputs per CCIR 624-4 standards. Specifications are provided in the SPECIFICATIONS section.
POWER:
The BSG-26 Series accommodates a wide range of line voltage from 90 VAC minimum to 255 VAC maximum.
The line frequency range is 50 to 60 Hz. The units utilize an IEC 320 inlet to accommodate the proper power cord set
for the line voltage connectors used in any geographical area. The combination of the wide voltage range and
universal inlet contributes to the diversity of applications where the BSG-26 will supply a dependable source of black
signal. The module internally regulates the bus voltage to +5 VDC (U8) and -5 VDC (U9). Circuit protection is provided
by an externally accessible fuse (Figure 1).
FRAMES:
The BSG-26 units are assembled in a stand-alone box. The metal enclosure provides desirable shielding from
external EMI / RFI noise sources. See the section on SPECIFICATIONS for recommended operational conditions. The
units are capable of rack mounting with the optional RMK-26 Rack Mount Kit. This 1RU rack mount does not require
blank panels for unused portions. A total of three (3) Series 26 units may be mounted with a single RMK-26.
CONNECTIONS:
The connectors are located on the rear panel. BNC connectors are used for the six outputs. Each of the
outputs are designed to drive a 75 Ohm load. The outputs must be terminated by a single end of line 75 Ohm
termination to ensure proper signal level. Unused outputs do not require a 75 Ohm terminating resistor.
1
2
3
4
5
6
FUSE
T40mA
100-240V~
50-60Hz
6W
OUTPUTS
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
250V
U
L
C
US
BSG-26
SIGMA ELECTRONICS, INC.
REAR PANEL
Figure 1
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JUMPERS:
Jumpers are provided for custom configuration. No jumper changes for normal Black Signal operation. See the
Service Manual for jumper details. Note: Jumpers selection to be performed by qualified personnel only.
ADJUSTMENTS:
Adjustments are provided for custom configuration. No adjustments are required for normal Black Signal
operation. Note: Adjustments to be performed by qualified personnel only.
SPECIFICATIONS
OUTPUTS:
BSG-26N: ........................................... (6) Blackburst, per RS-170A (NTSC), SMPTE 170M
BSG-26P: ........................................... (6) Blackburst, per CCIR 624-4 (PAL)
LEVELS: ............................................ In accordance with standards specified.
SCH PHASE: ..................................... 0° ±5°
SCH JITTER: ................................. < 2° p-p
SETUP & SUPERBLACK: ................. Jumper Selection, +7.5, 0, -7.5 IRE
MASTER CRYSTAL STABILITY: ......
17.734475 MHz TCXO (PAL)
14.318180 MHz TCXO (NTSC)
Initial ....................
vs. Time ...............
vs. Temperature ...
1 PPM
1 PPM/Year
1 PPM, 0° C to +50° C
CONNECTORS: ................................. BNC
POWER:
VOLTAGE RANGE: ........................... 100 to 240 VAC (-10%,+6%) (90 to 255 VAC)
LINE FREQUENCY: ........................... 50 to 60 (±5%, 47 to 63 Hz)
POWER CONSUMPTION: ................ 6 Watts nominal (9 Watts max.)
CONNECTOR: ................................... Power; IEC 320
ENVIRONMENTAL:
OPERATIONAL TEMPERATURE: ...
+32° to +131° F (0° to +50° C)
MECHANICAL:
DIMENSIONS: ................................... 1.75” H x 5.5” W x 8.5” D (44.5 x 140 x 216 mm)
SHIPPING WEIGHT: ......................... 4 lb. (1.8 kg)
TECHNICAL MANUAL:
Technical Manual is available upon request. See the Service Manual
WARRANTY:
Sigma Electronics, Inc. warrants that it’s products are free from defective material and workmanship at the
time of shipment from Sigma Electronics. The products will possess the electrical characteristics as set forth in the
specifications for a warranty period of five years. This warranty does not include any Sigma Electronics product or part
thereof which have been subjected to misuse, neglect, improper installation, use in violation of instructions furnished,
or accident. It does not extend to products that have been modified from original design outside the factory. Nor does it
extend to units from which the serial number has been removed, defaced, or changed. Nor does it extend to
accessories not of Sigma Electronics, Inc. manufacture.
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All specifications, drawings, dimensions, weights and other details are subject to change without
notification. Information is intended to give a general performance and operation guideline of the product.
Sigma Electronics, Inc.; P.O.Box 448; 1027 Commercial Avenue; East Petersburg, PA 17520-0448
Main Office: Tel: (717) 569-2681 Fax: (717) 569-4056
REV6 DEC98
BSG-26
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SIGMA ELECTRONICS, INC.
BSG-26 SERIES
SERVICE MANUAL
CAUTION
These servicing instructions are for use by qualified personnel only. To reduce the risk of
electric shock do not perform any servicing other than that contained in the operating instructions
unless you are qualified to do so. Refer all servicing to qualified service personnel.
Explanation of symbols used. The following symbols appear on the product.
DANGER
ATTENTION
Protective Ground
Fuse Replacement
AC
High Voltage
Refer to Manual
(earth) Terminal RISK OF FIRE REPLACE
FUSE AS MARKED
Power
Read the IMPORTANT SAFETY INSTRUCTIONS before installing or operating this equipment. Keep this
information in an accessible location for reference by all users. Follow all instructions in this manual for safe operation.
JUMPERS:
The following jumpers are located on the PCB inside the enclosure. They are provided for custom
configuration of the BSG-26N and BSG-26P. The modules should not require any adjustments for normal Black Signal
operation.
J1 Superblack/Black Select, Default position, Pins 2-3 (Black), Optional position, Pins 1-2 (Superblack).
J2 Setup On/Off, Default position 1-2 (Setup On, NTSC, BSG-26N), Position 2-3 (Setup Off, PAL, BSG-26P)
J3 Subcarrier Phase Select, 0° or 180°, Default position is 0°, Opposite position is 180°
ADJUSTMENTS:
The following adjustments are located on the PCB inside the enclosure. They are provided for custom
configuration of the BSG-26N and BSG-26P. The modules should not require any adjustments for normal Black Signal
operation.
C31 Subcarrier center frequency.
R7 Sync./Setup Gain, Set per standards specified.
R14 Subcarrier Null, Minimizes residual subcarrier on output signal.
R20 Burst Gain, Set per standards specified.
R22 Variable Subcarrier Phase Adjust, 180° SCH Phase adjust, See “JUMPER” section, jumper 3 options.
R25 Subcarrier Symmetry, Provides minimum difference in duty cycle between 0° and 180° setting of J3
DISASSEMBLY:
NOTE: REMOVE THE POWER BEFORE DISASSEMBLY OF THE UNIT.
Disassembly is not necessary for normal Black Signal operation.
Tools needed:
#1 Phillips head screw driver.
Procedure: 1st, remove the four rear panel Phillips head machine screws, one per corner. 2nd, remove the
electrical assembly by pulling the rear panel from the enclosure; the PCB is attached to the rear panel.
TECHNICAL MANUAL:
A manual including schematics, circuit description, parts list and setup guide is available upon request. This
information is intended for the service of the unit. The units should be serviced by qualified personnel only. Sigma
Electronics, Inc. recommends service to be performed by the Factory Service Center.
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