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Recognition Procedure-continued
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TM-11-490-5 Army Communications Facilities Operational Electromagnetic Compatability Manual
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Figure 4-1. Audio signals subjected to various interference effects.


TM 11-490-5
the effect on an audio signal of some of the terferers
listed in table 4-1.
Table 4-1. Audio Output Responses Characteristic of Various Types of Interference
Receiver audible output
Character of interference
Possible source or mechanism
Reduced noise level (or steady tone
Carrier (only)
Cochannel, spurious, intermodulation
(BFO) operating)
Pulsed variation in noise level (or
Pulsed continuous wave (CW) or
Adjacent channel, co-channel,
pulsed tone with BFO operating)
digital transmission
spurious, intermodulation, cross
modulation
Pulsed variation in noise level (two
Unwanted radio teletypewriter
Adjacent channel, co-channel,
pulsed tones with BFO operating)
(RATT) frequency shift keying
spurious, intermodulation, cross
(FSK) transmission
modulation
Added normal or distorted voice
Unwanted voice transmission
Adjacent channel, co-channel,
spurious, intermodulation, cross
modulation
Whistling or squealing
Unwanted transmission or in-
Adjacent channel, co-channel,
termediate frequency oscillation
spurious, intermodulation, cross
modulation, parasitic and IF
oscillation
Rapid variation in noise level (or
Unwanted facsimile transmission
Adjacent channel, co-channel,
several pulsed tones with BFO
spurious, intermodulation, cross
operating)
modulation
Steady tone or whining
High rate periodic pulses
Radar, rotating machines
Buzzing
Medium rate periodic pulses
Buzzers, vibrators
Popping
Low rate periodic pulses
Ignition systems, magnetos
Hum
Low (60 Hz) rate
Power lines
Frying
High rate random pulses
Electric arcs, continuously arcing
contacts
Sputtering
High rate random pulses
Arc welders, arc lamps, diathermy
Clicking
Low rate random pulses
Code machines, electric calculating
machines, mercury arc rectifiers,
relays, switches, teletypewriters,
thermostatic controls, electric
typewriters
Crackling
Static or corona discharges
Sharp crackle
Ambient noise
4-5


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