[Elecraft] Rhombic's etc.

[Ron D'Eau Claire]

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