Eric,
Stan has provided some good suggestions. I too have an old C3SS but with a
modern balun (K9YC design); it served me well for some years when I lived in
W6-land and now I'm back in UK it's planned as a fixed antenna as part of a
multi-beaming scheme.
If you decide to change dimensions (based on JK redesign, modelling or other
input) would you mind letting me know what those are?
73, David G3WGN M6O
-----Original Message-----
From: Stan Stockton [mailto:wa5rtg@gmail.com]
Sent: 23 September 2021 09:15
To: Eric Rosenberg <ericrosenberg.dc@gmail.com>
Cc: towertalk@contesting.com
Subject: Re: [TowerTalk] Old Force 12 C3-SS info needed
Eric,
I think at minimum I would replace whatever you are using for a balun with
something new and up to date from an engineering standpoint. There aren’t any
20 year old balun designs, whether a coil of coax or something using ferrite,
you would want to use on a new antenna going up today.
JK antennas has taken this antenna design and made changes to improve the
performance using computer modeling which is better than whatever method was
used to design the original antenna. There would be no question in my mind
about which design would provide better results, particularly SWR curves. I
would find out exactly what modifications are needed to duplicate the JK
antenna design.
Here is what you should expect with those changes.
https://jkantennas.com/c3s-jk.html
73… Stan, K5GO (ZF9CW)
> On Sep 22, 2021, at 6:54 PM, Eric Rosenberg <ericrosenberg.dc@gmail.com>
> wrote:
>
> The element and boom to mast clamps on my 20 year old Force 12 C3-SS are
> very rusty and need to be replaced.
>
> Nowhere in the construction/instruction manual do I see where size size is
> specified.
>
> Does anyone have that information?
>
> For that matter, if anyone has suggestions on what mods/fixes I should make
> on this antenna, which hasn't been touched since I put it up a long time ago,
> please pass them along.
>
> Thanks & 73,
>
> Eric W3DQ
> Washington, DC
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