--- "In Hawaii, 40 meters worked great for NVIS probably 11 out of 12 months a year. Someone else who knows can comment, but I got the impression that 40 meters almost never works for NVIS in the mainland US. If this is true, an Elecraft NVIS field day might be limited to those who either have room for an 80 meter dipole, or who can devise some other kind of 80 meter antenna that can radiate up."
I think it depends on time of day, time of year, and what part of the sunspot cycle. 40m is pretty much the top limit for NVIS though. But sometimes 40 works for NVIS. That's one of the reasons for our 60m allocation, NVIS when 40 is too long and 80m is dead. OTOH I've seen 160 too long for statewide coverage at times. FWIW, I agree a vertical is not an NVIS antenna. Some people may be confusing groundwave (usually up to 25 miles) with NVIS. They are totally different propagation modes. Ken WA8JXM On Fri, Dec 17, 2021 at 7:22 PM David Herring <david.n5...@gmail.com> wrote: > It is absolutely true that antennas intended for NVIS use do not have to > be hung low. But they CAN be. And there are instances where doing so can > be desirable. > > When I lived in Hawaii, we used NVIS for reliable statewide HF > communications to very good effect. When I hung my dipole up about 30 feet > or so, I would frequently get calls from hams in Japan, Oceana, mainland > US, Canada and elsewhere. Ordinarily that would be nice, but when one is > specifically focused on local comms, that can get to be a problem. When I > hung my NVIS dipole down around 10 feet, I still got excellent statewide > communications but no longer got calls from afar. > > So I kept my dipole low for local, and erected a vertical for DX. Both > worked perfectly for their intended use. > > In Hawaii, 40 meters worked great for NVIS probably 11 out of 12 months a > year. Someone else who knows can comment, but I got the impression that 40 > meters almost never works for NVIS in the mainland US. If this is true, an > Elecraft NVIS field day might be limited to those who either have room for > an 80 meter dipole, or who can devise some other kind of 80 meter antenna > that can radiate up. > > 73, > Dave - N5DCH > > > > > > On Dec 17, 2021, at 11:05 AM, Julia Tuttle <ju...@juliatuttle.net> > wrote: > > > > Wait, why would people think verticals are good for NVIS? Isn't a > > vertical's radiation pattern pretty much "sideways but not up", and NVIS' > > desired radiation pattern "up but not sideways"? > > > > On Fri, Dec 17, 2021, 12:54 Jim Brown <j...@audiosystemsgroup.com > <mailto:j...@audiosystemsgroup.com>> wrote: > > > >> On 12/17/2021 6:12 AM, Greg Herman wrote: > >>> What if there was the annual event called the The Elecraft > >>> NVIS field day? > >> > >> There is a major myth regarding NVIS that antennas must be low. This is > >> totally false. The facts are that vertical antennas are terrible for > >> NVIS, and that horizontal antennas work better up to nearly one-half > >> wavelength above ground. This study ran in National Contest Journal > >> several years ago. > >> > >> http://k9yc.com/AntennaPlanning.pdf > >> > >> 73, Jim K9YC > >> > >> ______________________________________________________________ > >> Elecraft mailing list > >> Home: http://mailman.qth.net/mailman/listinfo/elecraft > >> Help: http://mailman.qth.net/mmfaq.htm > >> Post: mailto:Elecraft@mailman.qth.net > >> > >> This list hosted by: http://www.qsl.net > >> Please help support this email list: http://www.qsl.net/donate.html > >> Message delivered to ju...@juliatuttle.net <mailto: > ju...@juliatuttle.net> > >> > > ______________________________________________________________ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft < > http://mailman.qth.net/mailman/listinfo/elecraft> > > Help: http://mailman.qth.net/mmfaq.htm <http://mailman.qth.net/mmfaq.htm > > > > Post: mailto:Elecraft@mailman.qth.net <mailto:Elecraft@mailman.qth.net> > > > > This list hosted by: http://www.qsl.net <http://www.qsl.net/> > > Please help support this email list: http://www.qsl.net/donate.html < > http://www.qsl.net/donate.html> > > Message delivered to david.n5...@gmail.com <mailto:david.n5...@gmail.com > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to wa8...@gmail.com > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
