[TowerTalk] 40m 4el KLM - replacing linear loading with coils

[Mike & Becca Krzystyniak]

Greetings All,

    I was considering a similar approach, by taking the existing design and
changing the linear loaded elements into center loaded dipoles. Start with
coil placement at LL insulator and tune to that elements current natural
resonant frequency.  Has anyone modeled it like this?

Mike K9MK



-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of
john at kk9a.com
Sent: Tuesday, April 28, 2020 1:35 PM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] 40m 4el KLM - replacing linear loading with coils

Rather than try to duplicate a design that is decades old, I think it  
would make more sense to redesign the antenna using loading coils.  
VE6WZ has some loading coil information on:  
https://www.qsl.net/ve6wz/index.html

John KK9A



Richard (Rick) N6RK wrote:


The problem is that you don't know the required inductance
of the coils.  It would be difficult to determine this
for anyone but M2.  At one time, W6ANR used to sell
coils for 40 meter Yagis.  Perhaps he has the values
and would be willing to give them to you.

The recent TT thread about determining the resonant frequency
of Yagi elements would help you.  You could find the 4
resonant frequencies of the 4 elements of the unmodified
Yagi, and then use trial and error to tune the inductors
to get the same element frequencies.  Seems like a lot
of work.

Rick N6RK

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