Larry,
I would suggest you consider an antenna that would look like a capital I or an
H turned 90 degrees. Feed it in the center of the vertical part and make the
top and bottom horizontal portions the same. I believe you can get close to 50
ohms with 50 inches vertical.
73…Stan, K5GO
> On May 21, 2022, at 9:02 PM, Larry Banks via TowerTalk
> <towertalk@contesting.com> wrote:
>
> 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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