160 is absolutely capable of NVIS; I've tested it and 160 NVIS works on
sideband with between 10 and 20 watts, or about 2.5 watts CW, so having
a groundwave signal nulled by NVIS is possible.
Larry W8ANT
Message: 1 Date: Mon, 16 Sep 2019 11:48:22 +0000 (UTC)
From: Dan Edward Dba East edwards <dan.n.edwards@sbcglobal.net>
To: Guy Olinger K2AV <k2av.guy@gmail.com>, Arthur Delibert
<radio75a3@msn.com> Cc: Roger D Johnson <n1rj@roadrunner.com>, Top Band
Reflector <topband@contesting.com> Subject: Re: Topband: Skip Distance
Message-ID: <1555768658.7896927.1568634502795@mail.yahoo.com>
Content-Type: text/plain; charset=UTF-8
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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>> --
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