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manual in the menu. After changing to manual, the REF is no longer
connected to the attenuator or amplifier and needs to be prevented from
being overloaded.
3.1.5 Relationship between REF AMP and sensitivity
The picture below, in which all the filters are neglected, shows the
simplified structure of the RF front end. Restricted by the overall architecture,
KC908 adopts a high-gain front end design. There are two levels of
preamplifier in the front of the frequency mixer or the IF. Below 6GHz, the first
level can be set to bypass, offering a maximum gain of 40dB. As for 6-
10.8/18.6GHz, the second level can be set to bypass, offering a maximum gain
of 40dB. When the frequency is below 6GHz, the placement of the amplifiers
for these 2 ports are exactly the same. And port 1 on the left doesn't support
receiving above 6GHz.
The gain of the IF amplifier can be numerically controlled, which is done
automatically. And the range is 0-30dB. To sum up, a maximum gain of 70dB
can be achieved with amplifier combination in the front of ADC. Take the loss
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