Owen,

Thanks for the comments.

On Tue, 09 Oct 2007 19:58:10 GMT, Owen Duffy wrote:
Denny wrote in news:1191956444.157030.11580@
22g2000hsm.googlegroups.com:
The other issue is whether your clock is actually able to synch with
the WWV signal... You may have a defect in the clock... It would seem
that 4 or 5 bars should have done the trick...

Presumably the LED meter indicates recieved power, not signal to
noise ratio.

Exactly. It's an LED bargraph driven by pin 9 on the TDA1072A chip;
according to the data sheet that's the "Field strength indicator
output", a log-scale output driven by the internal AGC amplifier.

I got a clearer WWV signal the other day and was able to re-tune my
antenna. It turns out that the "loud signal" I was tuning to wasn't
WWV, just some random RF I was overloading my poor clock with. The
bargraph now sits down at 1-2 LEDs most of the time, although I did
see a "bursty" period this morning where it went up to 3-5 LEDs.

The WWV audio was coming and going on about a five-second interval:
louder (almost clear), then softer (almost to disappearing), then
louder again. "Wow", so to speak. grin!

Ah, well. Maybe in my Copious Free Time I'll replace the MAC-II's
87C52 with something I understand, like an AVR, and program it _my_
way. (Oh. Then _I_ get the support calls. ... Ack!)


Frank
--
"Curiosity is one of the permanent and certain characteristics
of a vigorous mind. -- Dr. Samuel Johnson
--
Frank McKenney, McKenney Associates
Richmond, Virginia / (804) 320-4887
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