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

http://home.att.net/~wa1sov/technical/sync_det.html

While this synchronous detector works quite well, there is a link
http://home.worldnet.att.net/~wa1sov/technical/allpass/allpass.html
to a filter that allows improved reception by "rejecting" signals other
then the desired signal. While this does improve reception, it isn't
quite as effective as some literature would suggest.

If you really interested in synch detectors, Tom Holden has an
excellent
page, http://groups.yahoo.com/group/Synch_AM/messages that has
some links to very good resources.

Terry