Hello Jerry,
Interesting point. How would you generate the Tx frequency?
Clock 1 would need to be in the vicinity of 45Mhz +/- for the attenuation. The image generated in the clock 2 mixer would be again well over the LPF, so no issue there.
Then I am not sure what the gain of Q20-22 stage would do to the driving signal level. Maybe with sufficient shift in clock 1 to attenuate the signal, re-amplify in that Q20-22 stage and it could be of the right level?
73, John
