Scott, the hairpin is wound on a 3" diameter mandrel.
Mark
> ------------------------------
>
> Message: 3
> Date: Sun, 5 Apr 2009 13:52:37 -0500
> From: "Scott Dickson, W5WZ" <W5WZ@arrl.net>
> Subject: [TowerTalk] Need specs for 15m helical hairpin match on Force
> 12 C-31XR / C-51XR
> To: <towertalk@contesting.com>
> Message-ID: <89D7FDA2EC5D42969F41F5106E479200@BLACK>
> Content-Type: text/plain; charset="us-ascii"
>
> I am assembling my C-31XR / C-51XR stack with a separate feed line on each
> band. The F12 manual indicates the need for a helical hairpin match at the
> 15m feed point, and makes reference to reducing the number of turns to 3 if
> wide spacing is required to get a good match.
>
> What is missing, however, is the diameter of the hairpin coil. If anyone
> can help with that, it will sure help.
>
> --Scott, W5WZ
>
> See my station building progress at W5WZ.com
>
>
>
>
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