On 11/15/2012 01:47 PM, Tom Metro wrote: > Jerry Feldman wrote: >> Tom Metro wrote: >>> You can find receivers for the signal here (though this one is no longer >>> sold by Sparkfun): >>> https://www.sparkfun.com/products/10060 >> I found a couple of places, one in UK the other in CA. >> http://www.pvelectronics.co.uk/index.php?main_page=product_info&products_id=7 >> http://www.canakit.com/wwvb-nist-radio-time-receiver-kit-wrl-10060.html >> Out of stock > To clarify, the items you found are WWVB receiver modules, which also > turned up in my searches as tangentially related, but are not repeaters. > > They look slightly different, but essentially the same as the one shown > at Sparkfun. > > In theory, using one of these receivers on the front-end of a repeater, > and then remodulating the signal, should produce a higher quality output > signal compared to a simple narrow-band amplifier repeater. > > But if I have established reception problems, and easily available > alternative time sources, there seems little point in wasting time > finding an optimal location to place a WWVB receiver antenna. > > If I had a WWVB emulator using NTP as a time source, it could be > contained in a single box, and placed wherever it is best for coverage > to the clocks in my house. > > >> I've got the same problem. My night table clock syncs every once in a >> while, and my watch always syncs because I leave it on the window >> sill. > My watch, if left on a windowsill in a high window for a month or so, > will sync. Back when I first bought it, I didn't do anything special > with its placement and it would sync every few days. > > Similarly, one of my wall clocks used to sync every few days. Now its > been nearly 2 weeks from the time change and it hasn't received a signal. > > Something has changed to degrade the signal. > > Since what you want to do is to (1) get the current time from WWWVB and then amplify or repeat the signal. What about using a different time source, and build a module that emulates the signal, such as a GPS time module. Just a thought.
-- Jerry Feldman <[email protected]> Boston Linux and Unix PGP key id:3BC1EB90 PGP Key fingerprint: 49E2 C52A FC5A A31F 8D66 C0AF 7CEA 30FC 3BC1 EB90
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