Quantcast Figure 2-2. Transmitter spurious emissions for an AN/GRT-22.

 

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Narrowband interference
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TM-11-490-5 Army Communications Facilities Operational Electromagnetic Compatability Manual
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Figure 2-3. Example of distortion as a result of overdriving an amplifier stage


TM 11-490-5
Figure 2-2. Transmitter spurious emissions for an AN/GRT-22.
(c)
Intermodulation and cross modulation.
connections and waveguide hardware, foreign material
inside waveguides, electron tubes whose operating
Intermodulation, the combining of RF signals in a
characteristics have changed through use, and changes
receiver front end or transmitter final stage, and cross
in circuit resistance or capacitance values as a result of
modultion, the superimposing of the modulation of an
overheating or aging, all of which illustrates the
undesired signal on a desired signal, occur as a result of
importance of preventive and corrective maintenance
circuit nonlinearities. A nonlinear circuit is one which
procedures.
An overdriven amplifier becomes a
does not pass or amplify all voltage levels or voltage
nonlinear device which clips or
polarities equally. Circuit nonlinearities may occur from
such simple causes as corroded or loose antenna
2-4


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