Topband: Skip Distance

[Dan Edward Dba East edwards]

 i see the same thing testing with k5lc only 2 miles away, at high noon...
> 3db variations...trees blowing in the wind ??? makes you crazy...or, crazier, in my case ???
73, w5xz, dan

    On Thursday, September 12, 2019, 09:58:57 PM CDT, Arthur Delibert <radio75a3 at msn.com> wrote:  
 
 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 at 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 at 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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