Table 3-3. Control Indicator C-8157/ARC, Controls and Indicators (fig. 3-3)

TM 11-5821-285-12-1

Controls/indicators

Function

POWER switch (two-position locking toggle).

Applies or removes power (28 vdc) to associated KY-28 cipher

equipment.

POWER ON Indicator.

Lights when power is applied.

PLAIN/CIPHER switch.

Selects clear (PLAIN) or encrypted (CIPHER) mode of operation on

associated FM radio.

PLAIN indicator.

Lights when FM radio is in clear (PLAIN} mode.

CIPHER indicator.

Lights when FM radio is in encrypted (CIPHER) mode. (CIPHER

indicator will light with or without KY-28 installed).

ZEROIZE switch (two-position locking toggle switch Normally in off (down) position. Placed in on (up) position during

under spring loaded cover).

emergency situations to neutralize and make inoperative the

associated KY- 28 cipher equipment.

RE-X/REG switch (two-position locking toggle).

RE-X ....................... Permits ciphered communication through

a retransmission unit at a distant

location. (Not used in normal console

operations.)

REG ........................ Permits normal ciphered communication

Figure 3-3. Control, Radio Set C-7088/ARC-131.

3-4