On Wed, 21 Jan 2004 22:09:37 -0800, "Tim Wescott"
wrote:

I was just looking at my 2002 handbook, and there was a circuit for a
synchronous detector, in the receiver chapter. It wasn't "simple", but it
was there. It also uses NE604s (the companion chip to the '602), which
might not be available any more.

I constructed and tested that circuit with a Yaesu FRG-100. It works
reasonably well for ground wave signals. However, it has problems
staying locked during carrier fades. I tinkered extensively with the
phase lock gain and time constants, but to little avail.

The audio quality for local MW stations was amazingly good, however...


Jake Brodsky, AB3A
"Beware of the massive impossible!"