[TowerTalk] Folded dipole

[Steve, W3AHL]

One of the best technical presentations on NVIS propagation and antennas is 
at:

http://groups.yahoo.com/group/wl2kemcomm

Look in the files section for NVIS_Presentation_R1-4-8a.pdf by WA5BEN.  You 
need to join the group to access the files section.  There are older 
versions of the file at other sites, but get the latest rev.

Optimum height is 1/8th wave (30' for 80M, 16' for 40M).  Anything less just 
reduces efficiency with excessive ground losses.

I use a 80/40 fan dipole at 20'.  80M needs a tuner to cover the band, but 
40M covers 7.1 - 7.3 at less than 1.8:1 SWR without a tuner.  7.1 MHz is as 
low as I need to go for Winlink Pactor -- don't do CW.  I have an identical 
antenna in my go kit for portable use.

Steve, W3AHL
----- Original Message ----- 
From: "Tom Osborne" <w7why at verizon.net>
To: "Towertalk" <towertalk at contesting.com>
Sent: Monday, August 24, 2009 10:22 PM
Subject: [TowerTalk] Folded dipole


> Hi All
>
> Looking to put up another 40 meter antenna.  Need a NVIS antenna for
> close-in work.
>
> Is there any reason to put up a folded dipole instead of a tuned-feeder
> dipole?
>
> I think when this antenna was popular, it was touted to have more 
> bandwidth
> than a dipole.  But, if you have to use an antenna tuner to tune it 
> anyway,
> there doesn't seem to be any advantage over a regular antenna, bandwidth
> wise.  73
> Tom W7WHY
>
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