This is a Screendump (made with F7 key) from my Speccie hardware.
This image shows the frequency spectrum which my cable company
delivers in the UHF band. The AGC output from the FI1216 is connected
to the PCF8591 Input, which shows very low details.
This is a “digital camera” screendump from OE3GQW’s hardware, who
writes: “I use a much faster RSSI detector circuit ( Radio IC LA1145 from SANYO )
and for the resulution, the Bandwidth of the filter in front of the rssi detector is
important. ( Here i use 10,7 ceramic filter from murata with apr. 180 kHz bandwidth;
for better resolution the BW should be lower; but on the other side as the tuning steps
are 62,5 khz ( UV916 fix value ) the BW of the 10,7 filter should not be to narrow,
otherwise you would not see some sprectrallines.”.