Doug Smith W9WI wrote:

Pete KE9OA wrote:
Also, what about a regeneration circuit................would this be a good
thing?

I've seen the regeneration in the Kiwa loop demonstrated, and it's
certainly an *interesting* feature. I'm not really convinced it's all
that important if the attached receiver has adequate selectivity.

(on the other hand, if you're thinking about selling the antenna
stand-alone to people who want to use it with someone else's receiver,
the regeneration may be worth doing)

don't want it to suffer the R75 curse! I have been revisiting the Analog
Devices AD607 chip; this would make Sync AM possible, but this chip doesn't
have envelope detection. Analog Devices only has an application note for a

Speaking just for myself, I think if there's a decent synchronous
detector, there's no need for an envelope detector.

Agreed -- I'd never miss an envelope detector if I had a
good Sync. detector, but this is clearly ASSUMING the sync.
detector circuit degrades gracefully as it loses lock on
extremely weak signals. If it's going to pop rapidly in and
out of sync. in response to fast & deep fading instead, I'd
argue that would be a huge complaint area. The original
Drake R8 had OK sync., but it really couldn't handle signals
that faded below its ability to maintain phase lock. Same
with my Sony 7600G. I turn off sync. for very weak signals
to avoid the PLL sweeping around and making squeals and
other annoying noises as lock is acquired and lost rapidly.

Just a thought.

-- ross


--
Doug Smith W9WI
Pleasant View (Nashville), TN EM66
http://www.w9wi.com