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EXPOSURE TO NUCLEAR RADIATION.  Continued
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TM-11-5821-333-12 Non-ICOM Airborne Radio AN/ARC-201(V) ICOM Airborne Radio AN/ARC-201A(V) Manual
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CHAPTER 5 OPERATOR  MAINTENANCE


TM   11-5821-333-12 4-10. JAMMING AND ANTI-JAMMING. Jamming  is  an  Electronic  Counter  Measures  (ECM)  method  of  intentional  transmission  of  signals  on  the  same frequencies   that   you   use.   This   is   done   to   disrupt   your   ability   to   receive   needed   signals.   The   jamming   signal   is stronger than the signal of the station attempting to communicate with you. There are methods that may be used in  Electronic  Counter-Counter  Measures  (ECCM)  efforts  to  minimize  the  effects  of  jamming. a.   Jamming. Someone  may  be  trying  to  jam  your  radio  if  you  experience  the  following: (1). Sudden  loss  of  communications (2). Slow   degradation   of   communications (3) . Constant  static,  noise,  tones,  or  sounds b.   Anti-Jamming. Following  are  some  steps  that  may  help  maintain  communications. (1). (2). (3) . (4) . (5) . (6) . (7) . (8) . (9). (10) . (11) . (12) . (13). (14) . Use  minimum  power  required  to  maintain  communications Limit   transmission   time Do  not  transmit  unnecessarily Request  other  stations  to  increase  RF  output Continue   to   attempt   communications Change  location,  making  sure  you  have  line  of  sight Try  to  place  an  obstacle  between  you  and  the  jammer If in SC mode, change frequency (if directed by NCS) or change to FH mode (if directed by NCS) If  in  SC  mode,  press  push-to-talk  switch  three  times  to  eliminate  possible  equipment  mal- functions  such  as  a  stuck  push-to-talk  switch. Turn  FUNCTION  switch  to  Squelch  Off  (SC  mode  only). If  in  FH  mode,  change  PRESET  (with  permission). Utilize  COMSEC NEVER  discuss  that  you  are  being  jammed  while  using  the  radio Report  the  jamming  activity  when  you  can. 4-11. OPERATOR’S TROUBLESHOOTING CHECKLIST. If you have difficulty communicating, take the time to perform the following checks before you decided that there is something wrong with your radio. a. b. c. d. e. f. Make sure you have all switches set properly. Check  all  cable  connectors  (if  accessible)  to  ensure  that  they  are  tight. Try to verify that you have LOS with other net radios. Change  orientation  of  aircraft  to  see  if  communications  improve. If  you  have  not  heard  traffic  in  some  time,  perform  passive  late  net  entry. Determine  if  you  are  being  jammed  by  the  enemy.  If  so,  take  appropriate  action. 4-6


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