[MRCA] Antennas

[Radio Station KW1I]

This is the second time I tried sending this.  The new location may have
space for the crossed inverted Vs at a NVIS ideal height.  Maybe Steve could
stop by and make a few measurements in the next couple of months.


Rob and Gene,

I think there may be room for both antennas in the new location that Steve
says we are likely to use this year.  This location has a lot more open
space around it.  I like the idea of both antennas at Fairgrounds.  In fact
there may be room for a vertical there as well.   I wonder if we could have
Ted's base station switch between antennas?

Dale
KW1I


----- Original Message ----- 
From: <ersmar at comcast.net>
To: <radiobwn at riconnect.com>; "Military Radio Collectors Association"
<mrca at mailman.qth.net>; "Military Radio Collectors Association"
<mrca at mailman.qth.net>
Sent: Friday, July 21, 2006 9:41 PM
Subject: Re: [MRCA] Antennas


> Chris:
>
>      I modeled the dual inverted V dipoles that you describe.  They really
do work as well, on paper, as you are suggesting.  In fact, the 40M V
actually shows about 3 dB of gain at high angles with as little as 19 feet
for a center support height.
>
>      My concern about erecting such an antenna array at the MRCA Meet in
Gilbert is that we would need whole bunches of room around the antenna
because the arms are long, esp on 80M.  My thinking was to erect an AS-2259
with its limited space requirements and to try to load it with a tuner at
the base.  This might improve the power transfer into the antenna itself,
not just into the rig end of the coax (which is what an output Pi-net does.)
>
>      I already have the full-size elements for my inverted V array.  I'll
brew up a set of AS-2259 elements, too, and bring 'em along with the
fiberglass poles, etc.  If nothing else, we could string up some of the
elements as a low dipole, using four or five poles as end supports.
>
>      See you in September (from a song by the Tempos, 1959) at GIlbert.
>
> 73 de
> Gene Smar  AD3F
>
>
>  -------------- Original message ----------------------
> From: "Chris Bowne" <radiobwn at riconnect.com>
> > There has been a lot of discussion on the NVIS re the AS-2259s.  They
don't work
> > well on the 80 and 40 meter ham bands because they are resonant at 6 and
9 Mhz.
> > A better choice for amatuer NVIS would be a set of 40 and 80 meter
inverted
> > vees, either fed from one feed line, or seperate ones, oriented 90
degrees from
> > each other, and supported by a single 20 to 30 foot central mast, and
nominal 6
> > foot masts at the ends to keep them elevated enough so people wont be
running
> > into them.  I have used this arrangement for many years, and they work
well, and
> > can return a decent match to fixed tuned output rigs like my Yaesu
FT100D
> > without a tuner.  With a GRC9, matching is duck soup.
> >
> > Chris, AJ1G
> > Stonington, CT
> >
> >
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>
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