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@cctent.com>
>Subject: [TowerTalk] Matching coax lengths for stacking
Yagis?
>To: <towertalk@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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