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 <k2av.guy@gmail.com> 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 <n1rj@roadrunner.com> 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
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