Connections for Receive-Only Operation

TM 11-5815-206-12/ TO 31W4-2PGC1-61

b. If power for the signal circuit is to be sup-

operation, the source of power for the signal line

plied locally, as shown on station A, part A of

normally is located at the transmitting station.

figure 2-7, connect one of the two signal lines to

Connect one of the station's Two signal lines to

t e r m i n a l 1 and the other line to terminal 4.

terminal 3 of the line terminal board (B, fig. 2-6)

Disconnect the shorting bar from terminals 5 and 6

and the other signal line to terminal 4. Reverse the

a n d connect Power Cable Assembly CX-1202/U

c o n n e c t i o n s to terminals 3 and 4 if the C.C.

(fig. 1-5) to these terminals. Connect the plug of

MILLIAMPERES meter pointer moves to the left

the power cable to a 105-125-volt, dc power source.

of zero.

CAUTION

b. Low Level Units (fig. 1-15). Connect the two

Observe the C.C. MILLIAMPERES meter

s i g n a l lines to RCVR IN terminals 4 and 5 of

(A, fig. 3-1 ) when connecting the power

A1TB1.

cable to the dc power source. If the meter

pointer moves to the left of zero,

disconnect power, reverse the leads con-

nected to terminals 5 and 6, and reconnect

power.

c. If power for the signal circuit is to be sup-

plied by the distant station, as shown in station B,

part A of figure 2-7, check to be sure the shorting

b a r is connected across terminals 5 and 6 and

connect the two signal lines to terminals 1 and 4.

Reverse the signal lines if the meter pointer moves

t o the left of zero when the signal circuit is

energized.

for Half-Duplex Operation

2-12. Connections

(Voice-Frequency System) (Not Applicable to

TT-698(*)/TG)

(B, fig. 2-7)

a. Connect the shorting bar across terminals 5

and 6 (B, fig. 2-6).

b. Loosen the knurled nuts of terminals 2 and 3

a n d pivot the shorting bar that is attached to

terminal 3 away from terminal 2. Connect Cable

Assembly CX-1201/U (fig. 1-5) to terminals 1 and

NOTE

Cable Assembly CX-1201/U is equipped

with a black telephone-type plug at one

end and Cable Assembly CX-1200/U has a

similar type red plug.

c. Connect Cable Assembly CX-1200/U to

terminals 3 and 4 (fig. 1-5).

d. Insert the red plug in the REC jack of the

voice-frequency equipment, and insert the black

plug into the SEND jack. Reverse the leads

connected to terminals 3 and 4 if the pointer of the

D.C. MILLIAMPERES meter (A, fig. 3-1) moves

to the left of zero when the REC signal circuit is

energized. Refer to paragraph 5-3 for additional

installation details if the voice-frequency equip-

ment is the TH-5/TG: for information on voice-

frequency equipment other than TH-5/TG, refer to

the technical manual that covers the equipment.

2-13. Connections for Receive-Only Operation

a. High Level Units (A, fig. 2 - 8 ) . W h e n a

Figure 2-8. Connections for receive-only and full-duplex operations.

teletypewriter is connected for receive-only

2-10