Item 9. Radio Set AN/ARC-73(*), Vhf Communications

Item 8. Radio Set AN/ARC-51X, or AN/ARC-51BX, Uhf Communications (Continued)

RATINGS

PROCEDURE

GREEN

AMBER

RED

Set the pilot's and copilot's C-

1611(*)/ AIC for uhf communication.

Turn Control C-4677/ARC-51X or C-

6287/ARC51BX to TR. 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 9. Radio Set AN/ARC-73(*), Vhf Communications

RATINGS

PROCEDURE

GREEN

AMBER

RED

Note: Do not transmit on emergency

Received and transmitted signals

No sidetone heard.

No reliable two-way communication possible

vhf frequency of 121.5 megacycles.

heard in pilot's and copilot's

Reliable two-way

from either position.

Set the pilot's and copilot's C-

headsets and strength and

communication possible

1611(*)/AIC for vhf communication.

readability of signals are adequate

from one position

Set the vhf control unit to the

to maintain two-way

only(pilot's and copilot's).

frequency of a local vhf station and

communications at each position

Squelch inoperative.

establish two-way communication

(pilot's and copilot's). Squelch

from the pilot's position and then

operative. Sidetone heard in

from the copilot's position. After

headsets.

communication check, tune to an

unused channel and check squelch.

TM 11-11 20-209-ESC