(c) A greater than normal level of noise or an obviously modulated
signal may mean a noise-modulated jamming signal is jamming the radio. The
operator should temporarily disconnect the antenna. If normal static noise
returns when the antenna is disconnected, the radio most likely is being
jammed by a noise-modulated signal.
(d) If the above tests indicate there is a high probability the
radio is being jammed, the operator should follow the local SOP to
reestablish
and
initiate
a
report
informing
higher
headquarters the incident.
(2) AN/VRC-12 series radio.
(a) Turn the squelch control from the NEW SQUELCH ON mode to the
NEW SQUELCH OFF mode.
(b) A radio's lack of noise and lighted call light may mean an
unmodulated jamming signal is jamming it.
Temporarily disconnect the
antenna. If normal static noise returns, and the call light goes off when
the antenna is disconnected, the radio is likely being jammed by an
unmodulated signal.
(c) A greater than normal level of noise or an obviously modulated
signal may mean the radio is being jammed by a noise-modulated jamming
signal.
Temporarily disconnect the antenna.
If normal static noise
returns, and the call light goes off when the antenna is disconnected, the
radio is likely being jammed by a noise-modulated signal.
(d) If there is a high chance a radio is being jammed, the
operator should follow unit SOP to reestablish communications.
He should
also submit a report to tell superiors about the incident.
(3) You should coordinate with military intelligence units for aid in
developing tests for special capacity radios or radios unique to your unit.
Examples include the improved high frequency radio (IHFR) and single-channel
ground and airborne radio system (SINCGARS) radios. You must make sure your
radio operators are trained to use these radios.
4.
Overcoming Jamming. An enemy will seek to use new and more confusing
jamming.
You must be alert to the possibility of jamming.
Training and
experience are the most important tools in determining when a signal is a
jamming signal.
Exposure to the effects of jamming in training or actual
situations is invaluable.
Once you determine jamming is being used, take
the following actions.
If any of these actions lessen the problem, you
should continue normal operations and send a report informing higher
headquarters of the incident.
a. Continue to operate. Stop and consider what an enemy does during a
jamming operation.
Enemy jamming often involves a jamming period, then a
brief listening period.
He is attempting to determine how effective his
jamming has been. What we do while he is listening tells him how effective
his jamming has been. If our operation continues in a
3-5
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