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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.
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