Thread: Local station bad harmonics on 80 meters
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Old January 24th 07, 10:48 AM posted to rec.radio.amateur.antenna
André André is offline
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First recorded activity by RadioBanter: Jan 2007
Posts: 11
Default Local station bad harmonics on 80 meters

"R. Scott" a écrit dans le message de news:
...


I solved such a problem by receiving on separates antennas: two center
loaded verticals 3meter high and about ten meter between them.
By adjusting attenuation and phase delay between the two antennas i got a
null in the spurious direction (ground wave), but no nul for incomming
signals from correspondants because the phases after ionospheric propagation
were not constant and identical on the two antennas.
Unfortunatly I have forgotten the phasig system I used, it was lengths of
coax (WL/8) and a variable capacity, found on QST or Ham Radio at the end of
the sixtees or at the beginning of the seventees.
For attenuation it was a simple linear double pot.

73

André F5AD
http://f5ad.free.fr/.


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