> Many A/D converter systems use a sample and hold before the A/D converter. > If you do the same before your sound card (your A/D converter) and drive the > S&H with an audio output from your sound > card, say at 6.1 kHz you would get a 1 kHz signal into your sound card to > process. You can call it under sampling > aliasing or whatever.
Yes, this would work, but instantaneous sampling would tend to alias in many harmonics, requiring good prefiltering at RF (if you can call 60 kHz RF). Just as easy would be a mixer from CMOS switches, driven say at 50 kHz to get 10 kHz into the sound card. The WWVB signal apparently has a double-sided bandwidth of about 1200 Hz (not clear from the paper if that means 3 dB bandwidth or something else). To get all of the signal something like 2 or 3 kHz might be safest, requiring an IF of several kHz at least. Cheers, Peter _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
