Rick, I don't understand the chart. Is it the shaded area that encompasses each of the propagation types? If so, why doesn't the skyway extend to at least 28 Mhz?
Seven Three, Michael - K5WRN http://www.qrz.com/db/K5WRN On Wed, Nov 4, 2015 at 10:03 AM, Rick Hiller via BVARC <bvarc@bvarc.org> wrote: > *Resent for graphics correlation correction. Thanks, Michael…….Rick* > > > > > > Recently, thanks to Jeff, AA(zero)ST, I received an installation/user > manual for the Stealth Telecom Mobile Antenna System NVIS Whip Accessory. > (PDF attached) It is an add-on 14 foot whip that is pulled down at the tip > end to make it more horizontal. > > [image: cid:image002.jpg@01D116E4.47229BA0] > > > > There are some user notes on the page that I thought interesting for > antenna aficionados. One chart, shown below, shows the effects of using > the NVIS whip, but more to the point and BVARC oriented, the chart shows > the propagation that we experience on the BVARC Wednesday Night 75 Meter > Rag Chew Net…..what we affectionately refer to as “the Donut Hole”. The > *Donut > Hole* (circle in red on the chart) is *the (varying) area were line of > sight and ground wave (if any) stop and then NVIS takes over a few miles > more away.* The dotted line is 3910 KHz. > > > > > > If you would like to read more about the NVIS and the Rag Chew Net…find it > here… > > *BVARC Tech Articles* page. > > http://www.bvarc.org/index.php?page=tech > > > > and read the article by Larry, K5LJ: > > “*Shortened Dipole Study for Conditions On BVARC’s Rag Chew Net”* > > > > Thanks to Jeff for the inspiration. > > > > Enjoy….Rick – W5RH > > > > > > _______________________________________________ > BVARC mailing list > BVARC@bvarc.org > http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org > >
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