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the strongest signal and gradually approach the interference source (the tested range
should be over 70dBμ (-37dBm) near the interference source).
Chart 4-4: Crossover Point and Operation Example on Map
Putting band pass filters between antenna and instrument can greatly improve
the testing reliability. Usually this filter is in helical structure or in cavity structure.
Before using it, user can adjust its pass-band frequency under KC901M's monitoring.
When the testing signal is weak, user can also concatenate LNA (low noise amplifier)
between the filter and the instrument.
To locate an interference source exactly, besides the guiding theories and
auxiliary technologies, what you need are continuous practices to accumulate
necessary experiences and skills so as to enhance efficiency and effectiveness. After
several tests, especially the tests in cities and mountain areas, there will be various
illusory directions because of signal's diffraction and the reflection.
* For the narrow-band signal, the interference source will have higher response
speed by being searched in field strength mode.
* When testing the emission field around radio station's antennas, field strength
mode must be used. The medium frequency gain in the frequency spectrum mode
should be set by users themselves, but keep in mind that it may be broken by the
strong signal because of the wrong setting.
Warning:
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