Table 3-5. Control Radio Set C-6287/ARC-51BX, Controls and Indicators (fig. 3-5)

TM 11-5821-285-12-1

Controls/indicators

Function

Function select switch (four-position rotary switch).

Applies power to ARC-51BX radio and selects mode of operation:

OFF........................ Removes power from ARC-51BX radio.

T/R ......................... Enables transmission and reception;

guard

receiver is inoperative.

T/R+G Permits transmission and reception;

guard

receiver is _operative.

ADF........................ Not used on console.

Mode selector switch.

PRSET CHAN........ Enables selection of preset channel using

PRESET CHAN selector control.

MAN ....................... Enables selection of normal T/R

operating frequency.

GD XMIT................ Enables selection of guard transmitter

frequency.

10-megahertz control (18-position rotary switch).

Selects operating frequency in 10 MHz steps (first two numbers left

to right on MC indicator).

1-megahertz control (10-position rotary switch).

Selects operating frequency in 1-MHz steps (third number on

MC indicator).

O.1-megahertz control (10-position rotary switch).

Selects operating frequency in 0.1 MHz steps (fourth number on

MC indicator).

MC indicator.

Indicates selected operating frequency in megahertz.

VOL control.

Adjusts audio output level.

SQ DISABLE switch.

OFF........................ Squelches receiver output at preset

threshold levels.

ON ......................... Removes squelch from receiver output.

PRESET CHAN selector control

Selects 1 of 20 preset operating channels.

3-7