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

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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