Item 20. Direction Finder Set AN/ARN-83. Radio Compass (Continued)

RATINGS

PROCEDURE

GREEN

AMBER

RED

tenna (ANT) mode of operation.

quate volume is heard in headset.

Bearing indicator

ADF indicator inoperative in both LOOP and

With the station tuned in properly.

In ADF mode, bearing indicator

inoperative in ADF mode.

COMP modes.

set the C-6899/ARN for ADF mode.

gives correct relative bearing to the

Reliable adf station

After the needle on the bearing

station. Operation of LOOP switch

signals heard at one

indicator stabilizes, operate the

moves the needle to the left and

position only (pilot's or

LOOP switch momentarily to the right

right of the relative bearing. Needle

copilot's).

and then left while observing the

returns to relative bearing when

bearing indicator. Set the C-

LOOP switch is released. In LOOP

6899/ARN for LOOP mode of

mode of operation, and with BFO

operation. Turn the BFO switch on.

turned on, a beat note is heard in

Using LOOP switch, move bearing

the headset. Pitch varies as radio

indicator pointer to either side of the

tuning is changed. Volume of beat

station bearing. Tune in a station,

note increases as the loop is rotated

identify, and perform tests on each of

away from the station bearing.

the three bands.

TM 11-1520-209-ESC