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January 24th 06, 11:38 PM
posted to rec.radio.amateur.homebrew
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WWV receiver
On Tue, 24 Jan 2006 17:43:07 -0500, "xpyttl"
wrote: "Tim Shoppa" wrote in message roups.com... wrote: How about a simple one to three transistor regenative reciever. In principle that's a great idea, but the gotcha is that very near WWV's 10MHz frequency there are a lot of powerhouse SW broadcasters. Well, I suppose it depends on where OP is. Here in the middle, 10 MHz isn't much of a problem but 15 is. *HOWEVER*, 10 has one huge advantage -- there are very low cost uP crystals for 10 MHz, so building even a simple reciever with a brick wall front end isn't such a big deal, if the only frequency you care about is 10 MHz. Personally, I'd go with a DC rather than a regen - a lot simpler and these days, a simple SA612 will give you way more sensitivity than you can possibly use on 10 MHz for a couple bucks. Well, with a crystal filter in front maybe you will need a little amp, not so sure. But still quite a bit simpler than a regen. Heck, if the local QRM isn't too strong, I bet a 10 MHz uP crystal, a 612 and an audio amp (like a 386 or so) is all you would need. A friend of mine did an article on a simple WWV reciever for QRP Homebrewer recently, issue #5 I think. He was more interested in the frequency standard than hearing the sounds, so his contribution was recognizing the zero beat, but still an interesting article if you can find a copy. For wwv I consider DC the least useful. One approach I've also tried is 9.6mhz crystal LO and use 455khz if can retuned to 400khz. that works and uses fairly easy to get parts. That allows a diode detector for zero beat against external sources and copy of the audio without beats. Allison |
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