RadioBanter - View Single Post

David · July 30th 06, 06:38 PM posted to rec.radio.shortwave

On 30 Jul 2006 09:28:29 -0700, "N9NEO"
wrote:

Sorry for being such a RX newbie here. I guess I shoulda stayed awake
more during signals class. My expertise is very large switching and
resonant power supplies and transmitters.

So the multipath distortion causes fading of the carrier only?? This
makes some sense to me. A small set of the lower sideband frequencies
would also cause phase cancellation, but since the audio spectrum is
moving around so fast no one notices. I think I'm on the right track
here. So use another carrier slaved to the received carrier and you
get better reception during fade. Even if it wanders a few cycles
during fade you probably don't hear anyway. I guess that is how a sync
detector works.

I Imagine it would be a chore to build a sync detector from the ground
up, but I would also think it must have already been put into an ic
chip, no???

I like the link R2000swl posted to AmWindow for the precision full-wave
rectifier. I think I'll stick it on a pc board and give it a try. If
anybody wants a board let me know. They are very inexpensive.

bm, or anyone else, if you have good link to ELPAF or alternative RX
circuits then maybe I could throw that down on same board if not too
much room.

Details of board size at www.expresspcb.com I do the small one double
side and no silkscreen 3 boiards 60bucks.

You can contact me off board at

73
Bob
N9NEO

http://users.adelphia.net/~alexmm/Prod_det/detector.htm