Jamming and Anti-Jamming Actions

TM 11-5820-890-10-8

5.7e.

Jamming and Anti-Jamming Actions

DEFINITION

Jamming is the intentional transmission of signals that interrupt your

ability to transmit and receive. Interference is the accidental disruption

of communications by friendly sources. For practical purposes, the

following coverage of jamming includes both situations. Anti-jamming

includes any corrective action taken by the operator to work through

intentional jamming and accidental interference.

IDENTIFICATION

If you are being jammed, you may hear strong static, strange noises,

random noise, or no noise or signals at all. If you suspect you are being

jammed, look for one of the specific symptoms shown in the table

below.

SC OPERATIONS

Jamming/anti-jamming procedures for SC mode of operations are as

shown in the chart below.

JAMMING/ANTI-JAMMING PROCEDURES; SC MODE OF OPERATIONS

SYMPTOM

POSSIBILITIES

ACTIONS

You hear no traffic, and you are not

Your handset could be stuck,

Press PTT several times to free up

transmitting. SIG display is lit and

producing a "hot mike"

mike. If necessary, replace

shows a signal higher than LO.

situation.

handset with known good one.

You are being jammed. In SQ

If feasible, try to place an obstacle

OFF, you hear strong static or

between you and the enemy.

Notify your supervisor and, if

random noise. When antenna

appropriate, prepare a MIJI

is disconnected, SIG display

drops and noise disappears or

feeder report.

is reduced.

Your RT is faulty or locked up.

Set RT FCTN to STBY position

With handset and antenna

and then back to SQ ON. If

disconnected, your SIG display

problem continues, contact your

remains lit and above LO.

unit maintenance.

Set RT FCTN to SQ OFF and try

You hear random radio traffic. Your

You are experiencing friendly or

SIG display is lit and shows a

enemy radio interference.

to communicate. Change to a

signal higher than LO.

longer range antenna. If feasible,

try to place an obstacle between

you and the source of

interference. Advise NCS of your

problem.

Set RT FCTN to SQ OFF, and you

You may or may not hear any

You are probably experiencing

hear noise or static each time the

enemy sweep jamming.

noise SIG display goes on and off

SIG display lights. If feasible, try

at regular intervals or in random

order.

to place an obstacle between you

and the enemy. Advise NCS of

your problem

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