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[TowerTalk] 10M 4:1 "Transformer"

To: Ham - Tower Talk <towertalk@contesting.com>
Subject: [TowerTalk] 10M 4:1 "Transformer"
From: Larry Banks via TowerTalk <towertalk@contesting.com>
Reply-to: Larry Banks <larryb.w1dyj@verizon.net>
Date: Sat, 21 May 2022 22:02:12 -0400
List-post: <mailto:towertalk@contesting.com>
Hi All,

I am designing a rather unique 10m FM vertical for my local repeater net.  It has to fit into my attic, which is only 50" tall.  I have this antenna designed, and it "should" work, but it has an impedance of essentially 14 ohms.  (Typical for a shortened antenna.)  I want to fabricate a 4:1 transformer to facilitate this.  There are many such things available on the web, many of which I question. PLUS, I wish to design and build this myself.

I would appreciate any suggestions about how I should go about this.  Ferrite type and size, etc.  I have to admit that I have not yet done an exhaustive search of the already available sources, especially all of the great stuff from Jim, K9YC.  What I have already looked at is lots of ads for questionable stuff.

73 -- Larry -- W1DYJ







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