I would suppose the efficiency (?) and having a low SWR on all bands are
again confused. I still go by the theory that multibanders in general (G5RV
and variations thereof) radiate equally poorly in all directions. BUT and
it's a big BUT they do get you on air on a band that you normally may not
have room to operate on due to zoning or other space restrictions, its why
the hobbies is fun ... Getting all these different things to works as best
you can..
Trent Sampson
[PO Box 1647 Toowoomba Qld 4350] VK4TI
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of David Gilbert
Sent: Saturday, 20 January 2007 9:16 AM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] dipole length adjustment
That's true to a point. I have used efficient homebrew antenna tuners my
entire ham radio life and wouldn't be without one. But you can get some
REALLY ugly radiation patterns from trying to use the same antenna
on several bands. The antenna may tune fine and still not be putting
your RF even close to where you want it to go. I always tried to stay
reasonably close to a half wavelength ... for example, using a 50 foot
dipole for both 20m and 40m still gives a fairly clean pattern on both
bands.
Dave AB7E
Donald Chester wrote:
> The best way to solve the problem once and for all is to feed the
> dipole with open wire tuned feeders, using a balanced, link-coupled
antenna tuner.
> That way you can instantly change the resonant frequency of the
> antenna to any spot in the band from the comfort of the operating
> position. And one dipole can cover multiple bands without traps or other
jury-rigging.
>
>
> Don, k4kyv
>
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--
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