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Equipment Susceptibility
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TM-11-490-5 Army Communications Facilities Operational Electromagnetic Compatability Manual
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Spurious response interference


TM 11-490-5
the same frequency or channel or when the transmitters
have been assigned adjacent channels.  Interference
occurs  when  the  carrier  frequency  or  sideband
frequency of the interferer is within the bandpass of a
victim receiver (fig 2-7 and 2-8).
Figure 2-8. Adjacent-channel interference.
(b ) Intermediate-frequency interference. A form
of interference known as intermediate frequency (IF)
Figure 2-7. Cochannel interference.
interference may occur if a high-amplitude signal at the
receiver IF reaches the mixer or IF stage (fig 2-9)
through the receiver antenna and front end, or through
the equipment case or cabling.  Since the IF of a
receiver normally remains constant through the tuning
range of the receiver, this type of interference is
characterized by its presence at all tuned frequencies of
the receiver.
Figure 2-9. Intermediate-frequency interference.
2-13


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