I certainly remember when I was a kid that we would have deep fades on a.m. BC stations coming from 20 miles away, plus or minus a few. But that was at night. Are you doing your tests in the daytime? Topband and a.m. BC frequencies are so low that I would think they’d reflect off the ionosphere even at near vertical angles of incidence. But in the daytime, I would expect the skywave to be absorbed by the D layer.
— Art, KB3FJO > On Sep 12, 2019, at 10:35 PM, Guy Olinger K2AV <[email protected]> wrote: > > Decidedly possible. > > W4KAZ RBN node is 7 miles away. There is skywave contamination almost every > evening with large drops. It can be increased or reduced by the choice of > antenna at the RX site, but not eliminated. > > The largest signal to the RBN is usually high noon. That is fudged by wet > local conditions, but very obvious in long dry spells. > > Why or how? No idea. Stuff I was taught all these years doesn't really > explain. > > You can try your measurements at summer dry high noons part of a dry week. > Where I live that would improve your results. Can't be sure that > extrapolates to your location. > > 73, Guy K2AV > >> On Thu, Sep 12, 2019 at 9:02 PM Roger D Johnson <[email protected]> wrote: >> >> I've been running some tests on my 8 circle array with K1JB. Joe is 17 >> miles >> away and I sometimes notice deep fading on his signal. Makes plotting the >> antenna pattern very difficult. Is it possible to have skywave >> contamination >> at this short range? >> >> 73, Roger >> _________________ >> Searchable Archives: http://www.contesting.com/_topband - Topband >> Reflector >> > -- > Sent via Gmail Mobile on my iPhone > _________________ > Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
