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[TowerTalk] 2 vs 3 ele 40m yagi - opinions?

To: <towertalk@contesting.com>
Subject: [TowerTalk] 2 vs 3 ele 40m yagi - opinions?
From: k2av@contesting.com (Guy Olinger, K2AV)
Date: Tue, 6 Feb 2001 08:53:00 -0500
I'm going to use a prop pitch to do that. (C31 & 340N).

-----------------

Guy Olinger, K2AV
Apex, NC, USA

----- Original Message -----
From: Bob Otto <N8NGA@one.net>
To: <towertalk@contesting.com>
Sent: Tuesday, February 06, 2001 7:14 AM
Subject: Fwd: Re: [TowerTalk] 2 vs 3 ele 40m yagi - opinions?


> Hello Dan,
>
> Hmmmmmmmmmmm    Is  the  TX2  suitable for turning a C31XR *and* a 40M
> Beam??
>
> 73 from.......
>
> Bob Otto
> N8NGA@one.net
> Cincinnati, Ohio
>
> Time Written:
> 7:11:47 AM
> Attachments:
> <none>
>
> **********************************************
> DXCC 10M         ** DX is !! **        WAS 10M
>        There is a very fine line between
>          "HOBBY" and "MENTAL ILLNESS"
> **********************************************
> When trouble arises and things look really bad,
> there is always one individual who perceives a
> solution and is willing to take command.
>       VERY OFTEN THAT PERSON IS CRAZY!
> **********************************************
> Tuesday, February 06, 2001, 1:53:42 AM, you wrote:
>
> DL> I am building a new station at my vacation place in Northern CA.
I will run
> DL> a C-31XR for 10-20 meters, and want to stack a 40 meter yagi with
the C-31.
> DL> The rotor will be a Tail Twister.  The station will be used
primarily for
> DL> domestic contesting - Sweepstakes, NAQP, CQP, etc.  I have steeply
sloping
> DL> foreground to the US.
>
> DL> I have the remains of an old Telrex 3-29 40 meter yagi.  The boom
is pretty
> DL> beefy, and 29 feet long.  I plan to design and build a 40 meter
yagi from
> DL> the parts, either a 2 element 50 ohm direct dipole feed yagi on
about 22' of
> DL> the boom, or a 3 element beta match fed 3 element yagi on all 29'.
I have
> DL> two questions:
>
> DL> 1) The 2 element yagi will be lighter, put less torque on the
rotor, have
> DL> less effective wind area, etc.  It will also have .5 - 1 db less
gain than
> DL> the 3 element, and a fair bit less front-to-back ratio.  Any
thoughts on
> DL> which way to go?  Am I just asking for huge mechanical issues if I
put up
> DL> the 3 ele., especially with the rotor?
>
> DL> 2) I have to choose whether to use full size 40 meter elements, or
to load
> DL> them somehow (probably capacity hats at the ends of the elements.
4 2'
> DL> spokes shortens the elements to about 56' - 8' of hat spokes saves
5.5' of
> DL> tip length (per side).  Maybe F12 style linear loading line the
new N
> DL> elements.).  It seems clear that electrically, the full size
elements are
> DL> better.  Mechanically, it isn't clear to me which way to go.  Any
thoughts
> DL> on why the shortened elements might be better?  Less torque on the
> DL> mast/rotor?
>
> DL> Thanks much!
>
> DL>             ***dan, K6IF
>
> DL> P.S.  My web site, including the 10 meter contest story, will be
back on the
> DL> air soon at http://www.k6if.com .  My ISP went out of business
rather
> DL> suddenly, crashing my old site.
>
>
> DL> --
> DL> FAQ on WWW:               http://www.contesting.com/FAQ/towertalk
> DL> Submissions:              towertalk@contesting.com
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> DL> Problems:                 owner-towertalk@contesting.com
>
> ===========END ORIGINAL MESSAGE TEXT=========
>
>
>
> --
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> Submissions:              towertalk@contesting.com
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> Problems:                 owner-towertalk@contesting.com
>
>


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