[time-nuts] WWVB 60 kHz Loop Antenna Progress
phk at phk.freebsd.dk
Tue Oct 19 21:54:47 UTC 2010
In message <4CBDE533.9080101 at att.net>, Brooke Clarke writes:
>I've been winding a number of loops for WWVB and have one that looks
>good on test equipment.
You should do a test where you warm the rod+windings in your hand,
I found the center frequency would drift significantly with even
minor temperature changes.
It would of course not be unreasonable to temperature compensate a
ferrite rod antenna, but I have been wondering if it would be
possible to build a SDR receiver for 60kHz (or 77.5kHz) where the
CPU autotunes the high-Q antenna based on the detected signal, but
have not gotten the necessary round tuit.
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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