TM 11-5820-890-10-3 FREQUENCY HOPPING OPERATION. SYMPTOM POSSIBILITIES ACTION SIG marker is lit and (1) You are being (1) Reconnect the antenna. showing a signal high- jammed if you dis- Use terrain to mask your RT er than 3.  The signal connect the antenna from the suspected enemy marker may light on (MP) or antenna ca- location.  Contact NCS and and off at regular inter- ble (vehicular) and your supervisor. vals (pulsing) or light the SIG marker is steady.  There is strong reduced or drops static or noise when you to 3 and the noise attempt to hear net is reduced. traffic. (2) You may be re- (2) If possible, obtain auth- ceiving interference orization to have the inter- from a nearby high- ferring equipment turned power communica- off (this determines if you tion system (this is are receiving interference a co-site problem). or if you are being jammed by the enemy).  Move away from the source of interfer- ence by using terrain to mask your RT from the source.  Attempt to remotely locate antenna(s) or RTs, separating antennas at least 50 meters.  Use one RT at a time. SIG marker is lit and (1) There is a corm- (1) Press handset push-to- showing a signal higher promised or captur- talk 2 times.  If voice or data than 3.  You hear a ed RT in your net. transmissions return, con- constant hiss or back- The compromised tinue to operate.  Contact ground noise in the RT is constantly NCS or refer to SOI.  Use handset, but no real transmitting to act authentication 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.  Contact in your net that is NCS.  Use authentication locked in the trans- procedures. mit (push-to-talk) position. 2-49