[MRCA] Antennas

[ersmar at comcast.net]

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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