Yep, 60khz is VLF (Very Low Frequency). It will not propagate via
skywave (skip) as it is far too low of frequency to be refracted by the
ionosphere. The signal will be degraded by the sun, so when attempting
to receive WWVB you will want to achieve full dark-path. IE: It is dark
where you are and also dark at the transmitter.
WWVB takes a full minute to send a packet, so it is definitely a nightly
sync and not a realtime clock source.
Btw, if anyone is interested in decoding VLF, you can do it with only a
soundcard:
http://www.vlf.it/trond2/softreceiver.html
-Adam
On 12/15/2011 12:00 PM, Jon wrote:
On Dec 15, 5:44 pm, Adam Jacobs<[email protected]> wrote:
This was how I implemented my WWVB nixie clock. Since I can't receive
60khz groundwave in Seattle during the daytime anyways, it makes sense
to have the display turn off in the middle of the night for sync.
I've not actually implemented this yet in one of my clocks, but it
always struck me that this was a really elegant solution to the
problem. Just turn the SMPSU off for a few minutes in the middle of
the night while you capture the signal. Nobody's looking at 3am. Plus
isn't the reception at these wavelengths better during hours of
darkness?
Cheers,
Jon.
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