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TM 11-5821-333-12
4-8. EXPOSURE TO NUCLEAR RADIATION. Continued
Displayed for about 3 seconds.
Signals beginning of self-test.
Displayed for about 2 seconds.
Indicates ECCM module present
in RT.
Displayed for about 7 seconds.
Tests all segments of display.
End of cycle. RT
test.
c. Check Net Time Clock Operation
Press radio /TIME button three times. Note if seconds are
has passed self-
running. If they aren't, complete following
steps. Briefly turn FCTN switch to OFF and back to SQ ON.
d. Establish Communications
If you are NCS try to contact net members on MAN or CUE preset. If you are a net member, use
cue procedure to contact NCS.
Section Ill. OTHER OPERATING CONSIDERATIONS
Subject
Para
Page
Jamming and Anti-Jamming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-10
4-6
Line of Sight/Nap of the Earth Communications . . . . . . . . . . . . . . . . . . . . . . .4-9
4-5
Operator’s Troubleshooting Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
4-6
4-9. LINE OF SIGHT/NAP OF THE EARTH COMMUNICATIONS.
Nap of the Earth flying may be necessary for crew safety, however, it may result in communications problems.
The radios antennas must be able to “see” each other. While flying Nap of the Earth, this may not be possible,
Considerations for line of sight include:
a. Reasons for loss of communications:
(1) .
(2).
(3) .
(4) .
(5).
b. Ways
(1) .
(2) .
(3) .
(4) .
(5) .
(6).
(7) .
Transmission power too low because of setting
Obstacles such as hilly terrain, vegetation, and
Orientation of aircraft to sending station
Polarity of antennas
Metal in aircraft rotors
to improve line of sight/communications:
Reduce distance between stations
Increase transmission power
Increase altitude
Change location
of radio control or distance between radios
man-made structures
Change radio being used (changes antenna configuration)
Change aircraft pitch and/or yaw
Request retransmission
4-5
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