TM 55-1680-351-10
(4)
If the radio is being used for tactical operations only, use
the earphone when enemy forces are near enough to hear the speaker.
Keep transmissions brief in all tactical operations.
b.
Emergency or Tactical Operation. Operate the equipment as
follows.
(1)
Remove protective cover.
(2)
Select highest exposed point (hills, trees, rooftops, or
uppermost portion of airframe) and set radio in a secure and upright
position with the antenna pointing upwards. Avoid antenna proximity to
metal uprights, nearby antennas, or rock formations which may contain
conducting minerals. If in the water, keep unit and antenna as high as
possible above water level and keep the antenna connector and frame
area as dry as possible.
(3)
Set the function switch to the BCN 243.0 position
(clockwise).
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