TM 55-1680-351-10
37.
Operation in Maritime, High Altitude,
or Rainy Areas
Keep the AN/PRC-90 in a dry area if possible. Avoid rigging any cover
materials near the antenna in salt atmosphere. Watch for accumulations
of salt between the antenna base and the radio. Remove any fouling
sediment to assure proper operation. No special procedures are required
for high-altitude operation.
38.
Recognition and Identification of
Jamming
Under tactical conditions, the AN/PRC-90 may be jammed by the enemy.
This jamming may be planned or accidental and will usually be caused by
a strong signal transmitted on the same frequency as that being used.
The signal being transmitted may be a steady carrier or a modulated
carrier. When it becomes difficult or impossible to receive the desired
signal, switch the function switch to the alternate voice channel or revert
from the voice to the MCW mode and attempt CW contact.
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