[Elecraft] Rhombic's etc.

[Kevin Rock]

How about 20 acres with 100 foot fir trees?  Would that meet your 
standards?
    Kevin.  KD5ONS




On Thu, 27 May 2004 09:52:50 -0700, Ron D'Eau Claire 
<rondec at easystreet.com> wrote:

> Ha! That shows the reason not to believe computer programs, Sander!
>
> That's far bigger than rhombics used in the commercial installations I 
> saw
> ever were, and far bigger than the design formulae suggests.
>
> A more common size is about 1.5 to 2 wavelengths per leg. So, for 80 
> meters,
> the diamond will be almost 300 meters tip to tip and less that side to 
> side.
>
>
> The height is the same as any horizontal antenna. In very broad, general
> terms you want to shoot for something approaching 1/2 wavelength on the
> lowest frequency used, although lower antennas are commonly used to good
> effect. In commercial stations, it was common for the rhombics to be 
> only 60
> to 100 feet up.
>
> Still, it's more room that most of us have. Gosh, I always heard that 
> Hams
> in New Zealand had at least 50 acres per Ham for an antenna farm! But 
> then
> folks think that any Ham in Oregon has at least 10 acres with 200 foot 
> Fir
> trees to hold up his wires... Wish it were so...Sigh!
>
> Ron AC7AC
>
>
> -----Original Message-----
> OK, so the rhombic sounds like a good idea for the club house, where we 
> have
> a big park to put up temporary antennas.  I plugged some figures into an
> antenna program I had lying around, and came up with a design for a 
> rhombic:
>
> Length per side 10.970km
>
> Height 478m
>
> This way it would cover a fair part of the suburb, but at least the 
> aircraft
> would be able to get in underneath it!
>
>
> Maybe a tribander beam then .
>
> 73 de ZR6SW
>
> Sander Wissing
>
> KX1 - #251
>
>
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