TM 11-5820-890-10-1
FREQUENCY HOPPING OPERATION.
SYMPTOM
POSSIBILITIES
ACTION
SIG marker is lit and
showing a signal high-
er than LO. The signal
marker may light on
and off at regular inter-
vals (pulsing) or light
steady. There is strong
static or noise when you
attempt to hear net
traffic.
(1) You are being
(1) Reconnect the antenna.
jammed if you dis-
Use terrain to mask your RT
connect the antenna
from the suspected enemy
(MP) or antenna ca-
location. Contact NCS and
ble (vehicular) and
your supervisor.
the SIG marker is
reduced or drops
to LO and the noise
is reduced.
(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 com-
(1) Press handset push-to-
showing a signal higher
promised or captur-
talk 2 times. If voice or data
than LO. 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.
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