Dr. Heinz Doofenshmirtz
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Basically (I think) you are adding a power supply to power the LNB. The "channel master" or similar device is measuring RF signal strength, and converting that to DC, to push the VU meter, then pushes a VCO for your audio output. I'm assuming it "sounds" similar to a metal detector. I've seen some detector circuits floating around out there, that look very similar to a single diode crystal radio tuner. I will probably build one of these dudes for NON-ITC purposes here in the new year, just for fun......It shouldn't be too hard getting some noise out of it.
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