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Joel Kolstad wrote:
I've been thinking about building a WWVB (time code on 60kHz) receiver, and wanted to get some suggestions for the architecture. Poking around the web some, I did find one receiver where the guy built a synchronous detector using a PLL and VCXO to phase-lock to the 60kHz carrier. Nice idea -- especially since he wanted the 60kHz carrier as a synchronization signal. However, I just want the time data... so... wouldn't it be easier to build a mixer at, e.g., 59kHz and then use an envelope detector to get a loud/quiet audible (1kHz) tone (WWVB reduces power by 10dB to signify 0 bits in its time code)? It seems to me that this approach avoids the need for the PLL and VCXO, which is a nice 'reduction' in complexity. Also, since I'll have a microcontroller around to decode the time code anyway, it can easily generate the 59kHz signal. Thanks, ---Joel Kolstad I think you will need a receiver with a narrow band pass. The phase locked scheme can help you get a very narrow band pass. Another arrangement is use the 1 Khz as you planned and use a FFT program to get the signal out of the noise.. And maybe, at your location, the signal is strong enough that my concerns do not apply. Bill K7NOM |
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