Re: Vertical spacing of wires in 5-el hexbeam
I had a similar (but not so acute) problem and decided to sacrifice
12m; but that is very much a personal decision.
30 inches sounds very tight indeed. If you're using Leo's construction
method is there any chance you could use longer "poles" on the
baseplate to push the spreaders out further?
If you do decide to try to cram in the 5 bands, a couple of things you
1) Achieving vertical separation at the centre post is more important
than at the ends - because that's where the highest currents flow.
2) Try to utilise the total height available in a way that band
separations are proportional to wavelength i.e. don't use it all up
on the 20m/17m gap at the cost of making other band elements too close.
- Thanks to K4KIO Leo for his help. The simple answer is my spreaders
are 5-6 inches too short. They need to be at least 120 inches (as is
clearly stated on Leo's website). The moral is all 13' crappie poles
are not created equal!
In answer to my original question I think I'll forge ahead and create
a 3-band version for now. I expected to rebuild this antenna at
least a few more times, for example next time using an aluminum
baseplate instead of kitchen cutting board, so I'll learn from this
one and do it better the next time around.
--- In firstname.lastname@example.org, "roycarlson12" <rcarlson_ac0fn@...>
> I'm building my first hexbeam following the instructions on K4KIO's
> I have a minor problem in that my spreaders (13' crappie poles with
> the last section removed) are a little short. When my 20m elements
> are horizontal and placed as far as possible out on the spreaders,
> the mast end they are only 30-31 inches above the baseplate insteadhave
> of the recommended 38 inches.
> At this point I have the 20 and 17m wires roughed in with zip ties
> and it appears that if I want to keep the wires horizontal I'll
> to leave out the 10m and possibly 12m elements due to the lack of
> vertical space on the mast.
> My question is should I bring the elements up to a higher point on
> the mast resulting in wires that are not horizontal, or should I
> scale this back to only 3 bands? I am leaning towards a 3-band
> version given the solar cycle what it is today.
> Thanks - Roy AC0FN