[Elecraft] WTB: CPK for Butternut HF-6V

[Don Wilhelm]

Remember (or understand if you did not before) that elevated radials 
should be tuned (pruned for length) just like a part of the antenna 
(they *are* part of the antenna).

So get out your antenna analyzer and cut one radial a bit on the long 
side - attach only that one radial to the vertical and shorten it until 
you have the correct readings on the antenna analyzer.  Cut the second 
radial to the same length - move to the next band and do the same thing 
until you are done.  Note that the radials can interact on a multiband 
setup (just like parallel dipoles), so tune the lowest bands first and 
move upward in frequency one band at a time.

The twinlead solution does work, but suffers badly from interaction.

73,
Don W3FPR

Jerry Flanders wrote:
> At 04:54 PM 8/19/2008, Vic K2VCO wrote:
>> Niel Skousen wrote:
>>> I'm installing a used Butternut HF-6v, and the location / elevation
>>> would work with the CPK raised counterpoise.  So I'm looking for a
>>> counterpoise kit for a B.Nut HF-6V..  Also, wanting to add 6m, but
>>> that's trivial, unless someone has it sitting around....
>>
>> You don't need an expensive 'kit'! Just take any old wire and make two 
>> 1/4 wavelength radials for each band -- a total of 12 radials. Try to 
>> make them as symmetrical as possible, with the two 40 meter radials 
>> opposite each other, etc.
>>
>> The ends of the radials must be well-insulated, since even though they 
>> are connected to the coax braid at the center, they will develop 
>> high-ish voltages at the ends.
>> -- 
>> 73,
>> Vic, K2VCO
> 
> Details on making a multiband radial from twin-lead are at: 
> http://www.bencher.com/pdfs/00366IZV.pdf
> 
> Jerry W4UK