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A quick look at trying to change the 45.75 MHz to be programmable finds that its not controlled by the PLL. It has a separate fixed source. I will investigate Brian's origiinal request for replacing the programmable cable function (chan 2-73 with +/- 9.75 MHz offset) with a programmable frequency.
No clue here about the passband of the analog amps that might cause a low frequency attenuation.
Dave
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