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radiodetector is attached after preselector. As a compensation, KC908 allows
user to manually specify gain and attenuation and those unspecified
parameters will still be adjusted automatically. In harsh electromagnetic
environment, it's advised to specify a attenuation of 10dB of higher, do not
use the 40dB RF gain(AMP), and leave other settings at auto. Yet manual
adjustment is not practical if the signal changes, at this time the function gain
limit becomes useful.
While working near a high power transmitter(or unknown strong
interference source), interference outside the bandwidth could possibly jam
the front end of the receiver, making the tested signal appears to be smaller
than it actually is. While direction-finding on foot, the direction which the
tested signal appears to be greatest might be the direction which outside-
band-interference happen to be weakest. In this case, if the tested signal is at
the same location of the interference source (commonly, the same iron tower),
the user would be drived to the opposite direction. If in doubt of this scenario,
view the band as wide as possible with the spectrum function of find out
whether there is a strong interference. Or, simply trade it with a little bit of
sensitivity and set the RF gain to 20dB(which is the default value).
This situation is not common, yet user should keep it in mind.
Gain Limit
NOTE
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