TM 11-5820-890-10-1UNUSUALWEATHEROPERATION IN BAD WEATHER. If you are operating your radio in unusual weather,do the PMCS more often. Keep your radio controls as clean as you can (especiallythe keyboard and display). Keep your radio shaded from the sun as much as possiblewhen operating in a hot climate.Your radio should operate under any of the following conditions:l Moist heat (tropics)l Ocean sprayl Sand or dust stormsl Dry heat (deserts)l Salty airl MudOPERATION IN LOW TEMPERATURES. Keep ice off of your equipment. Cables maybecome brittle if they are exposed to cold weather. Do not bend them at sharpangles. Make sure the vehicular charging system is strong enough for you to commu-nicate. Batteries lose their power when they get cold. lf you have a dismount radio,check the battery life condition more often. Log battery life condition each time youassemble or disassemble manpack.NOTEIf you have SC or FH presets in the RT, do not set FCTNif the temperature drops below +20° F. You may cause the presetsto be cleared by shutting off RT power.Your radio has been tested and it is water tight. You do not have to make specialpreparations for water crossing. After fording, remove any mud or other foreign mat-ter as soon as you can.4-30
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