Radio Interference Suppression.

SECTION III (Con't.)

Possible remedy

Probable cause

High pressure filter clogged ------------ Replace high pressure

filter

Thermoswitch defective -------------------- Replace the thermo-

switch.

3-27 Radio Interference Suppression.

3-28 Definition.

The term "interference" as used herein

(A) Interference.

applies to electrical disturbances in the radio frequency range which

are generated by tie test stand and which may interfere with the

proper operation of radio receivers or other electronic equipment.

(B) Interference Suppression.

The term "interference suppress-

ion" as used herein applies to the methods used to eliminate or effect-

ively reduce radio interference generated by the test stand.

Purpose of Interference Suppression.

The tactical importance

3-29

of effective interference suppression cannot be stressed too greatly.

Since the electrical disturbances generated by the test stand are com-

posed partly of electrical waves in the radio frequency range they

must be suppressed for two important reasons.

First, they will inter-

fere with the proper operation of the friendly radio net, and second,

they will enable the enemy to locate the equipment and its associated

unitsl

3-30 General Sources of Interference.

Generally, radio interference

is generated anywhere a spark occurs or where a high-frequency

current is present.

A spark is a small amount of current jumping an

air gap in response to the force of a relatively high voltage. The

gasoline engine ignition system is a common source. Magneto breaker

points, generator commutators, relay contacts, and static changes