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Re: [TowerTalk] Telrex Redesign

To: <k1ttt@arrl.net>, <towertalk@contesting.com>
Subject: Re: [TowerTalk] Telrex Redesign
From: "KB1H" <kb1h@ct.metrocast.net>
Reply-to: KB1H <kb1h@ct.metrocast.net>
Date: Wed, 2 May 2012 10:22:27 -0400
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
I have a 20M and a 15M Telrex beam, both 5 elements. The only thing I did 
was heliarc the non-insulated elements where they go through the boom. 
Though Telrex never admitted the fault, the constant movement of the element 
just from wind eventually elongates the holes through the boom. One of the 
antennas actually cut through the sleeve that is used for passing through 
the boom.

Though performance wise these antennas model poorly they are a mechanical 
beast. There are much better performing antennas but not made as stout.

Dick

Visit "The Barnstormers Contest Group - NZ1U"
website http://www.qsl.net/kb1h/

24/7 Webcam Link on the website

Email KB1H@arrl.net   YCCC----> http://www.yccc.org/

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----- Original Message ----- 
From: "David Robbins" <k1ttt@verizon.net>
To: <towertalk@contesting.com>
Sent: Wednesday, May 02, 2012 10:11 AM
Subject: Re: [TowerTalk] Telrex Redesign


>i thought about that years ago also and decided the best option was to just 
>optimize the lengths.  this resulted in one director being eliminated 
>electrically, but in order to keep the weight and wind balance i left it in 
>place but shortened it so it wasn't really doing anything for the pattern. 
>if you start trying to move elements you would have to do lots of machining 
>or just figure methods of doing it by cutting pieces off the boom... i 
>decided that in the long run it was better to keep it mechanically intact.
>
>
> May 2, 2012 09:59:50 AM, n8de@thepoint.net wrote:
>
> Telrex elements go THROUGH the boom. Not sure how you would change
> element spacing without needing to change the boom entirely.
>
> If they were mine, I'd put them up and let them play!
>
> 73
> Don
> N8DE
>
>
> Quoting Dave Sublette :
>
>> Good morning,
>>
>> I have two six element, 46 foot boom, 20 meter Telrex yagis. One of them
>> I bought in 1979 and the other in 1993. One is in the air and the other
>> is in my barn. I have had excellent results with this antenna
>> electrically and mechanically. When I put the one up several years ago,
>> I "optimized" the element lengths(without changing element spacing) with
>> a computer program.
>>
>> Now I am thinking that maybe I might redesign it and try to optimize the
>> element spacing and, as has been suggested before, eliminate one element.
>>
>> Is there anyone on this list who has done this? Before I go
>> "re-inventing the wheel" I thought it would be good to ask. Also, is
>> there one antenna design program that you might think is better for the
>> job than the others?
>>
>> Thanks for your time.
>>
>> 73,
>>
>> Dave, K4TO
>> _______________________________________________
>>
>>
>>
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>
>
>
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