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CHANGING OPERATION SPEED OF REPERFORATOR
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TM-11-5815-238-20 Teletypewriter Sets AN/GGC-3 AN/GGC-3A AN/GGC-53 AN/GGC-53A and Teletypewriter Reperforator-Transmitters TT-76/GCC TT-76A/GGC Manual
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SIGNAL CIRCUIT CONNECTIONS FOR TT-76(*)IGGC. (Cont)
TM 11-5815-238-20
2-10. SIGNAL CIRCUIT CONNECTIONS FOR TT-76(*)IGGC.
Teletypewriter Set ANIGGC-3(*) or Teletypewriter Reperforator-Transmitter TT-76(*)IGGC provides dc current for
operation of internal local circuits ONLY. Current for external signal line circuits must be supplied by a telegraph
switchboard, line unit, Telegraph Terminal TH-5/TG or other external source.
Signal circuits within reperforator-transmitter are controlled by SELECTOR switch located to right of keyboard. Signal
circuits of transmitter-distributor, keyboard-transmitter and reperforator are terminated in standard 2-conductor jack
plugs. This permits reperforator-transmitter to operate in various sending and receiving combinations.
Wiring Options
NEUTRAL OPERATION:  For TT-76/GGC, the selector magnet is wired for 20-mA neutral operation when
reperforator is delivered by manufacturer. Wiring options for both 20mA and 60-mA neutral operation of selector
magnet are shown in figure below.
For TT-76A, B, CIGGC, set SIGNAL/BIAS switch on power supply and terminal unit to 20-MAor 60-MA position,
whichever is applicable. Insert plug from selector magnet cable into 20-MA or 60-MA socket, whichever is applicable.
2-9

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