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.edwa...@sbcglobal.net> To: Guy Olinger K2AV <k2av....@gmail.com>, Arthur Delibert <radio7...@msn.com> Cc: Roger D Johnson <n...@roadrunner.com>, Top Band Reflector <topband@contesting.com> Subject: Re: Topband: Skip Distance Message-ID: <1555768658.7896927.1568634502...@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 > <radio7...@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....@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 <n...@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 >>> _________________ >>> 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 > > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > Topband mailing list > Topband@contesting.com > http://lists.contesting.com/mailman/listinfo/topband > > > ------------------------------ > > End of Topband Digest, Vol 201, Issue 13 > **************************************** > _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector