On 10/03/2010 03:33 PM, Arthur Dent wrote:
Years ago I built a modification of the double shielded WWVB loop
antenna described by Don Lancaster in a 1973 magazine.
http://www.swtpc.com/mholley/RadioElectronics/Aug1973/RE_Aug1973.htm
I have been using that same antenna ever since with good results in NH
where the signal is pretty weak and can always get a strong signal. I have
used it with both a Tracor 599J and an older modified RMS Engineering receiver
that was originally designed for WWVL. I did have to rebuild the amp and circuit
board in the base of the loop a few years ago when it failed because the seals
had started to let water in and the whole amp was a total loss.
Thanks for the link. Always nice to get some input.
Have anybody cared to tune the isolating loop for better noise-suppression?
It will interact with the H-field due to stray capacitance over the
isolation gap, so by tuning it suitably it could be made to short out a
strong interference of higher frequency. Thus, it can act as a null in
addition to the normal resonance of the antenna.
Cheers,
Magnus
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