[TowerTalk] Short 20m 2l Yagi

[Ron & Madhavi]

Joe, I would urge your friend to look up the Force12 site which has a very
good write up on designing short Yagis. It may not be a specific design for
20m, but has a lot of useful information that would be handy to be armed
with. It was there that I learned that on a short Yagi the separation
between driven element and parasitic element resonant freqs are much lesser
than on monoband systems. This helped me with a 2el (loaded) wire yagi I
built sometime ago.

I have built quite a few shortened Yagis with mostly inductively loaded
elements (not the best!), but my next project would make me examine
capacitive and linear loading more closely. In the very recent past, I built
a capacitively loaded vertical which worked so very well that I am convinced
that I should make the second half and make it a vertical dipole! This
obviously is with the ultimate goal of making a Yagi!

I know this didn't answer you specific question, but hope the info on the
Force2 site would be of interest.

73,
Ron, 6Y5/4S7RO


----- Original Message -----
From: k7mks <k7mks at comcast.net>
To: <towertalk at contesting.com>
Cc: Dave Jackson <DavidJ1061 at aol.com>
Sent: Tuesday, January 13, 2004 9:06 PM
Subject: [TowerTalk] Short 20m 2l Yagi


A friend of mine, Dave KA7GLI,  is seeking comments, design info, for a 2
element shortened 20m yagi with a maximum element length of 18' for phone
band coverage.  Neither of us has access to any computer design programs.
Would appreciate hearing from those who have  successfully home-brewed a
shortened beam.  Leads to published articles would be appreciated.   Many
thanks, Joe k7mks
_______________________________________________

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