Quantcast SIGNAL CIRCUIT CONNECTIONS FOR TT-76(*)IGGC. (Cont)

 

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SIGNAL CIRCUIT CONNECTIONS FOR TT-76(*)IGGC.
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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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SEND ONLY AND LOCAL PREPARATION OF TAPE
TM 11-5815-238-20
POLAR OPERATION: Adapt the reperforator for polar operation according to instructions given below:
Polar Receive:
For TT-76/GGC, remove and tape separately BRN-WHT wire from terminal 5 and WHT wire from
terminal 4 of terminal block TB3. For TT-76A, B, CIGGC, set 20-BIAS/OFF-60 switch to BIASIOFF and
insert plug from selector magret cable into 60-MA socket.
NOTE
The following items are not supplied with the reperforator-transmitter:  220ohm wire wound
resistors, 7,000-ohm center tapped resistor (voltage divider) and a power source capable of
supplying 120 volts dc at 220 mA.
Polar Send:
The transmitter-distributor and keyboard-transmitter can be changed to send polar signals by making
wire changes, at terminal block TB2 of TT76/GGC or TB1 of TT-76A, B, CIGGC and by adding two 220-
ohm wire wound resistors, one 7,000-ohm center tapped resistor (voltage divider) and a power source
capable of supplying 120 volts dc at 220 mA to the circuit.
a. To make wire changes on transmitter-distributor:
 Remove gray plug and cord from terminals 6 and 7 of terminal block.
 Connect marking battery to terminal 7.
 Connect spacing battery to terminal 8..
 Connect one signal line wire to terminal 6.
 Connect other signal line wire to midpoint of 7,000-ohm resistor.
b. To make wire changes on keyboard-transmitter:
Remove black plug and cord from terminals 1 and 2 of terminal block.
Connect marking battery to terminal 1.
Connect spacing battery to terminal 3.
Connect one signal line wire to terminal 2.
Connect other signal line wire to midpoint of 7,000-ohm resistor.
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