[time-nuts] WWVB 60 kHz Loop Antenna Progress

Bob Camp lists at rtty.us
Tue Oct 19 21:59:02 UTC 2010


Also consider that there is a maximum practical Q for a rod antenna. Past a certain point the Q goes up because the flux is better contained. For an antenna to work, the flux can't be fully contained. Simply put, a toroid or pot core will make a very high Q inductor. Both make really lousy antennas.


On Oct 19, 2010, at 5:54 PM, Poul-Henning Kamp wrote:

> In message <4CBDE533.9080101 at att.net>, Brooke Clarke writes:
>> Hi:
>> 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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