In article , Doug Smith W9WI
wrote:
What is your reception goal for this receiver?

- High fidelity?

- High sensitivity?

- Adjacent-channel rejection?

- Overload tolerance?


Pretty much all of the above. Cost is secondary. Though I do like
simple elegance, and I'm not going to go as far as the SUPRX mentioned
by Bob, though it must be a fine rcvr.

Mark mentioned:
could design not only AFC, but also automatic tuning of an RF
preselector and perhaps even an antenna tuner, that would be tres
cool.

Signal strength is a different signal from AFC. AFC comes after the
signal has been limited, so that's sort of information is lost.

Yes, I know. I was just conceptually linking AFC to "AAT" and
"APS". The latter two would be a lot trickier I think since we're not
dealing with a monotonic function, but one with a peak. Might need a
uP or some overly complex analog circuits...


Speaking of quadrature demods, wouldn't best performance be had by
using a 23.3ns ) wideband delay instead of a single or
double-tuned LC. I just found one with 30MHz BW...

Michael