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their covering frequency interval are embeded out of factory, as a foundation
for reading adjustment.
When using ALC, REF setting only relates to the value interval of the
vertical axis, subsequently affects the position of the curve. The color of the
waterfall curve is linked with REF, user cannot specify the begin/terminate
level separately. The color of the curve may suddenly change if the gain is
automatically adjusted.
By default the audio AGC is enabled to keep the total audio power aligned
to the volume setting. If there is no signal at this time, a noticeably loud noise
would be heared no matter which demodulation mode is being used. The
default time constant of audio AGC is 1s.
3.2.5 Level/Field Strength
KC908 displays level on the top right corner of the screen. Level indicates
the total power within the demodulation bandwidth, which makes it different
from the marker on the spectrum. It can be adjusted by pressing MODU
button-demodulation-demodulation bandwidth. Demodulates signal is
extracted by rectangular filter, and this might makes its level not the same as
the marker, even if demodulation bandwidth is corresponding with RBW.
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