[TowerTalk] C3 value?

Gene Smar ersmar at verizon.net
Mon Jul 14 20:50:12 EDT 2008


     FWIW - A LPDA is at best a two element radiator.  The gain will likely be less than that of a three element Yagi.  The LPDA provides a wider bandwidth than the Yagi, hence its popularity with military, embassy, etc. installations.  

73 de 
Gene Smar  AD3F

From: jim Jarvis <jimjarvis at optonline.net>
Date: 2008/07/14 Mon PM 01:41:10 EDT
To: towertalk at contesting.com
Subject: [TowerTalk] C3 value?


I just picked up a 12 year old Force 12 C3, in an estate/takedown  
At the same time, I had two guys approach me, to buy it from me.

At the moment, I'm undecided whether to put this up, or to put up my  
T8 lpda,
for general purpose use, and light-duty contesting.

Other than rusted uBolts which hold the elements on, the antenna is  
clean and
in good shape.    This is the 3 element version, which I take to be  
the original C3.
It uses F12's single feedline, direct connected for 20m, and  
capacitively coupled for 10 and 15m.
I guestimated a 16' boom length.   We were all too tired to measure  
it, after the

So, I have a couple of questions:

1)  What's a fair market value for the antenna?

2)  Does anyone have first hand experience with it, on 12 and 17m?    
F12 says it works there.

3)  Does anyone have first hand experience of performance vs. an lpda?

I have some thoughts on item 3.   That is, the Tennadyne logs  
outperform trapped 3 el. tribanders,
due to their efficiency.   The F12 antenna, however, is three  
monobanders on a common boom.
No traps.   So, I would expect the C3 to slighty outperform the log,  
on three bands, stipulating that f/b, gain,
and vswr curves may not align to actually produce the hoped for best- 
cast performance.

Your thoughts?



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