Robert Rolf writes:
>The listed URL also has a listing of suitable chips and kits.
>Complete WWVB receivers are also available from Ultralink.

	I have a few questions for anyone who has built WWVB
receivers.  www.ultralink.com or .net don't appear to go to anything
related to this topic.

	Is there a neat modular approach to receiving the WWVB signal?
The tuned detector with AGC is the critical part along with a suitable
antenna.  As one who has seen how much less trouble receiving IR
remote signals are with one of those little modules one can buy or
salvage compared with trying to do the same thing from scratch, I know
the wisdom of standing on the shoulders of giants.

	I want two or three WWVB modules for building various projects
that need to know the time so I need to find somebody like Digikey or
Jameco who sells small quantities.

	Here in the Central USA, most WWVB clock devices I have heard of
seem to work well as long as the decoding software is smart enough
to not misread a marginal frame of data.  Some seem to work flawlessly
as long as they get a usable signal part of the day and others just
are too easily confused by bad reception to be of much use.

	I suspect the kind of detector I need either has a logic-level
output that delivers the varying-width pulse or delivers an analog DC
voltage related to signal strength.  Due to the number of PIC's with
A/D and or comparator inputs, either signal is fine with me.  The
advantage of a logic-level input is that WWV on short wave uses a
100-HZ sub carrier to send the same information that way.  One could
decode that signal as a redundant second channel in to the same
processor that normally reads the WWVB signal.

	Thanks for any ideas or caveats.

Martin McCormick WB5AGZ  Stillwater, OK 
OSU Information Technology Division Network Operations Group
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