craigm wrote:

msg wrote:


RHF wrote:

The Advantage of Synchronous Detection in the Sony ICF-SW7600GR
'portable' AM/FM Shortwave Radio

READ - The Advantage of Synchronous Detection in the Sony 7600G
-by- Daniel A. Grunberg
http://www.nyx.net/~dgrunber/7600g.ssi


'nyx.net' doesn't resolve either here in MN or from a host in SF, CA.


If you really want to see the article, put the title in quotes and search
for it on google. You will get one hit and then can look at the cached
version.

Indeed; that is always a good strategy but for archival references I
wondered if there was a correct URL.

That being said, the author of the does not really know how a sync detector
works, nor does he understand how it helps to receive a signal.

In other words, don't bother with this article.

I didn't.

FWIW, I have always just zero-beated a BFO on AM weak or noisy signals
to improve intelligibility; on receivers with good LO and BFO stability,
this works well. In an SSB mode, the product detectors and narrower
filters are additional advantages for AM signals. As a simple
homebrew retrofit for a synch det. capability, have any readers
ever built an injection lock circuit that locks the BFO using
limited IF (perhaps best suited to older rigs) or added a phase
detector and error amp to drive a varactor on the BFO xtal for
newer rigs? I see that there is a not-well-regarded injection
lock mod for the r-390a, but I would appreciate hearing about
results for other rigs as well.

Regards,

Michael