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Gain limit, which is meant to avoid the overload caused by the
interference outside displayed range, is located at the gain/attenuation menu.
This function comes as three options, minimum attenuation, maximum IF gain
and maximum RF gain.
For instance, if the min attenuation is set to 10dB, the attenuation would
be automatically adjusted to 20dB or 30dB if the signal is strong, yet however
weak is the signal, the min attenuation would remain 10dB. For max IF gain
and max RF gain, it works as the word means. So normally the max IF gain
option does not need adjustment.
Max RF gain only works while following REF.
No matter it's set to follow signal or follow REF, gain limit works, but it
does not affect manual gain setting. If manual gain setting and gain limit is
turned on simultaneously, then those options with a manual gain setting apply
the manual setting value, while the rest would be adjusted automatically and
be restricted by gain limit.
Gain limit only works in receiver mode. After gain limit is turned on, the
left-bottom part of the coordinate would display "limit" notification.
User can distinguish whether it's in auto mode or manual mode by the
color of ATT and AMP displayed on the screen. Golden yellow means auto
mode.
Whenever the gain is adjusted, KC908 would automatically adjust the
reading. The actual parameters of amplifiers and attenuators corresponding to
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