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Re: Topband: Skip Distance

To: Guy Olinger K2AV <k2av.guy@gmail.com>, Arthur Delibert <radio75a3@msn.com>
Subject: Re: Topband: Skip Distance
From: Dan Edward Dba East edwards <dan.n.edwards@sbcglobal.net>
Date: Mon, 16 Sep 2019 11:48:22 +0000 (UTC)
List-post: <mailto:topband@contesting.com>
 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@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@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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