DIRECTION FINDING OPERATION

TM 32-5895-206-10

a. After receiver and df antenna have been tuned for

maximum signal, adjust RF or RF GAIN control of the receiver

for approximately a two-thirds full scale reading on receiver panel

meter. Adjust VOL control as needed to set headset sound

level.

b. Find null (antenna position for minimum signal) as

follows. Rotate antenna pedestal mast to give minimum signal in

headset and null meter. As minimum is approached, adjust RF

or RF GAIN control to increase the signal strength to a useable

level. Do not set gain control to AVC position.

c. Read bearing of null under antenna mast cursor on

azimuth scale. Notice that two nulls 'can be found for every

signal. Nulls are exactly opposite each other on azimuth scale.

Target transmitter lies in the direction of one of the nulls.

d. Find location of target transmitter by taking a second

reading at another site. Location of second site will depend on

many conditions, which include tactical situation, available

terrain, and distance to target transmitter. Bearing of reading at

second site should be different enough from bearing at first site

to allow accurate plotting. Generally, second site should be

located at least 1000 yards from first site and at an angle of 900

from target bearing taken at first site.

2-64