Re: [BVARC] Re-SEND Correction -- NVIS -- Near Vertical Incidence Skywave and the BVARC Rag Chew Net

[Michael Wrenn via BVARC]

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 
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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Re: [BVARC] Re-SEND Correction -- NVIS -- Near Vertical Incidence Skywave and the BVARC Rag Chew Net

[Michael Wrenn via BVARC]

Gotcha. That makes sense.

Seven Three,

Michael - K5WRN
http://www.qrz.com/db/K5WRN

On Wed, Nov 4, 2015 at 10:15 AM, Rick Hiller via BVARC <bvarc@bvarc.org>
wrote:

> The vertical scale only goes to 15 MHz…..the chart is for the performance
> of the bent over whip, so lower angle radiation is attenuated.  I am sure
> that there is skywave produced by the bent over whip it run at 20  MHz but 
> *this
> chart is to show NVIS* and NVIS only happens in the lower HF spectrum, as
> described in the full manual.  There is no NVIS from about 8 Megs up.
>
>
>
> *From:* BVARC [mailto:bvarc-boun...@bvarc.org] *On Behalf Of *Michael
> Wrenn via BVARC
> *Sent:* Wednesday, November 04, 2015 10:08 AM
> *To:* BRAZOS VALLEY AMATEUR RADIO CLUB <bvarc@bvarc.org>
> *Cc:* Michael Wrenn <michael.k5...@gmail.com>
> *Subject:* Re: [BVARC] Re-SEND Correction -- NVIS -- Near Vertical
> Incidence Skywave and the BVARC Rag Chew Net
>
>
>
> 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
>
>
>
> ___
> BVARC mailing list
> BVARC@bvarc.org
> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org
>
>
___
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