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January 24th 07, 10:48 AM
posted to rec.radio.amateur.antenna
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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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