[Boatanchors] Beam elements

Tue May 12 21:33:55 EDT 2009

Hy-Gain used to market a rotatable dipole for
40/30 meters.  It was basically full half
wave for 30 meters and used linear loading
to "lengthen" it for 40 meters.  I had one
of these set on 30 meters 10 feet above my
Mosley PRO-67 beam.  It worked fine, but the
whole deal, tower and all, went away along
with the house when Mister Twister came
calling on 3 May 99!

73 - Mac, K2GKK/5
Oklahoma City, OK

* In my many years, I have come to the conclusion that one useless *
* man is a shame, two is a law firm and three or more is Congress. *

* -- John Adams (1735- 1826) *

________________________________
> From: rayfrijr at msn.com
> To: k2gkk at hotmail.com; boatanchors at mailman.qth.net; flboatanchors at yahoogroups.com; glowbugs at piobaire.mines.uidaho.edu
> Subject: RE: [Boatanchors] Beam elements
> Date: Tue, 12 May 2009 19:06:33 -0600
>
> Thanks.
>
> I am toying with a idea. I have the traps that were made to add 40 meters to the driven element of my triband beam.
>
> I never put the on because I thought it would be too unwieldly for my location, and I didnt want to add the extra guying that is usually added to the driven element.
>
> I was looking at them the other day and thought using them to construct a rotatable dipole for 40 meters might be worth experimenting with. That's why I wondered what the electrical wavelength of a triband beam element usually is.
>
> I was thinking that since the next band down from 20 meters, as far as the driven element of a tribander is concerned, is 15 meters, that if I made a 20 meter half wave antenna out of tubing or wire, and used these traps that maybe I could get the homebrew antenna to resonate on 40 meters, as it would do if I put them on the driven element of the tribander like they would do if I added them to the beam.
>
> If so, I could manage such a rotatable dipole, where it would be too unwieldly to add them to my tribander.
>
> What do you antenna experts here think?
>
> Ray WA7ITZ
>
>
>
>> From: k2gkk at hotmail.com
>> To: rayfrijr at msn.com; boatanchors at mailman.qth.net; flboatanchors at yahoogroups.com; glowbugs at piobaire.mines.uidaho.edu
>> Date: Tue, 12 May 2009 19:50:11 -0500
>> Subject: Re: [Boatanchors] Beam elements
>>
>>
>> Half wave, but shortened a bit by the coils in the traps.
>>
>>
>>
>> 73 - Mac, K2GKK/5
>>
>>
>>
>>
>>
>>> From: rayfrijr at msn.com
>>> To: boatanchors at mailman.qth.net; flboatanchors at yahoogroups.com; glowbugs at piobaire.mines.uidaho.edu
>>> Date: Tue, 12 May 2009 18:48:43 -0600
>>> Subject: [Boatanchors] Beam elements
>>>
>>>
>>>
>>>
>>> I'm wondering if someone here can answer a question for me?
>>>
>>>
>>>
>>> Tri-band beams ... are the elements usually electrically a quarter wave, half wave, or full wavelengths with the coils?
>>>
>>>
>>>
>>> Ray WA7ITZ
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