TM 11-5820-890-10-1FREQUENCY HOPPING OPERATION.SYMPTOMPOSSIBILITIESACTIONSIG marker is lit andshowing a signal high-er than LO. The signalmarker may light onand off at regular inter-vals (pulsing) or lightsteady. There is strongstatic or noise when youattempt to hear nettraffic.(1) You are being(1) Reconnect the antenna.jammed if you dis-Use terrain to mask your RTconnect the antennafrom the suspected enemy(MP) or antenna ca-location. Contact NCS andble (vehicular) andyour supervisor.the SIG marker isreduced or dropsto LO and the noiseis reduced.(2) You may be re-(2) If possible, obtain auth-ceiving interferenceorization to have the inter-from a nearby high-ferring equipment turnedpower communica-off (this determines if yoution system (this isare receiving interferencea co-site problem).or if you are being jammedby the enemy). Move awayfrom the source of interfer-ence by using terrain tomask your RT from thesource. Attempt to remotelylocate antenna(s) or RTs,separating antennas at least50 meters. Use one RT at atime.SIG marker is lit and(1) There is a com-(1) Press handset push-to-showing a signal higherpromised or captur-talk 2 times. If voice or datathan LO. You hear aed RT in your net.transmissions return, con-constant hiss. or back-The compromisedtinue to operate. Contactground noise in theRT is constantlyNCS or refer to SOI. Usehandset, but no realtransmitting to actauthentication procedures.noise or radio traffic.as a jammer.(2) There is a stuck(2) Press handset push-mike or bad handset to-talk 2 times. Contactin your net that isNCS. Use authenticationlocked in the trans-procedures.mit (push-to-talk)position.2-49
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