Item 8 Radio Set AN/ARC-51X.or AN/ARC-1IBX. Uhf Communications

TM 11-1520-209-ESC

Item 7. Radio Set AN/ARC-55(*). Ubf Communications (Continued)

RATINGS

PROCEDURE

GREEN

AMBER

RED

reliable testing. Establish

Both positions (pilot's and copilot's).

No sidetone heard.

communications with a station

Squelch operation normal Sidetone

located no less than 1 mile from the

heard

aircraft. Do not transmit on

emergency uhf frequency of 243.0

megacycles Set the pilot's and

copilot's C161 1()/ AIC for uhf

communication. Turn the control of

the C1827/ARC-55 for TR + G REC

operation. Set to frequency of local

uhf station. Establish two-way

communication from pilot's and

copilot's position. in turn. After

communication check, tune to an

unused channel and check squelch.

Item 8 Radio Set AN/ARC-51X.or AN/ARC-1IBX. Uhf Communications

RATINGS

PROCEDURE

GREEN

AMBER

RED

Nose: This radio set operates within

Strength and readability of signals

Reliable communications

No reliable two-way communication possible

line of sight. Man made or natural

are adequate to maintain reliable

possible from one

from either position.

obstructions between the aircraft and

communications from both positions

position only No sidetone

communicating stations may prevent

(pilot's and copilot's). Squelch

heard Squelch

reliable testing. Establish

operative; sidetone heard.

inoperative.

communications with a station

located not less than 1 mile from the

aircraft Do not transmit on

emergency uhf frequency of 243.0

megacycles