[FARC] NVIS Links FYI

[Rolan O. Clark]

Bob,

Thanks much, falls right into the hf digi use I will talk about tomorrow on 
73 info session .

73 de rolan w3fdk


----- Original Message ----- 
From: "Bob Moroney" <windbrkr at erols.com>
To: "FARC Mail List" <farc at mailman.qth.net>
Sent: Tuesday, March 17, 2009 2:11 PM
Subject: [FARC] NVIS Links FYI


> All,
>
> Here are three links pertaining to the NVIS-related stuff that we
> discussed at the FARC meeting last night.
>
> The first link is to a page that provides a very good tutorial on NVIS
> propagation phenomena and techniques, as well as still more NVIS links
> to investigate.
>
> http://www.athensarc.org/nvis.asp
>
> The next link is to an Acrobat document showing how to build an NVIS
> antenna based on the military standard version, the AS-2259.  It also
> includes info on winding the coils that improve the antenna's electrical
> performance.  We'll be making some of these coils (for 80M at least) at
> the April FARC meeting.
>
> http://www.k3cal.org/nvis_antenna.pdf
>
> The last link is to a site that tracks, on an hourly basis, the
> worldwide ionospheric conditions that support (or limit) NVIS
> propagation.  The chart on this site graphically shows why 40M is of
> little NVIS use at this time, at least at our latitude.
>
> http://hflink.com/propagation/
>
> 73, Bob K9CMR
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