[TowerTalk] Matching coax lengths for stacking Yagis?

[donovanf at starpower.net]

Paul,

I do the precise trim of the lengths of my phasing lines "in situ" 
at my tower bases with a time domain reflectometer.  My 
monoband Yagis use T-matches and 1/2 wavelength 4:1 coax 
baluns.   The 500 foot feedlines to each of my 3 element 40 
meter Yagis (in a two-high stack) come all the way back to the 
shack, and they're also precision cut "in situ" with the aid of a 
TDR.

T-matches and 1/2 wavelength coax baluns cause absolutely no 
problem with the TDR measurements.  I suspect there would 
also be no problem with your balun. 

73!
Frank
W3LPL

---- Original message ----
>Date: Fri, 10 Mar 2006 16:08:26 -0600
>From: "Paul Jansen" <PJansen at cctent.com> 
>Subject: [TowerTalk] Matching coax lengths for stacking 
Yagis?  
>To: <towertalk at contesting.com>
>
>Is it possible to use an analyzer to check transmission line 
length if the
>end is terminated in a balun such as those used on the 
KT34A? 
>
> - Possibly by using it at a much higher or lower frequency 
than the balun
>was designed for?  
>
> 
>
>I'm trying to avoid having to remove all the coax seal etc. and 
then
>shorting out the end as instructed.
>
> 
>
>Any suggestions?
>
> 
>
>Thanks, 
>
> 
>
>Paul / K9KDR
>
> 
>
> 
>
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