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Antenna observations



Experimentally compared 20 turn water pipe/housewire helix to 750mm
3turn helix fed dish today. Both mounted on my stepladder. Drake
converter with 145 if, std if mods (w-22pf caps) and
filter-extensions. Noise floor of receiver/converter s2- helix gave
s3/s4, dish gave s5/s6. Focus on dish calculated 293mm. Maximum signal
on feed adjustment came with focus halfway between helix reflector and
tip of final turn. This comparison was at 1500Z today from east
central Alabama.  
-- 
Eddie Seymour, WB4MLE
E-Mail wb4mle@mindspring.com
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