[TowerTalk] Old Force 12 C3-SS info needed

[David Aslin G3WGN]

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 at gmail.com] 
Sent: 23 September 2021 09:15
To: Eric Rosenberg <ericrosenberg.dc at gmail.com>
Cc: towertalk at 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 at 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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