[TowerTalk] KT-34A Tuning Problems

[Marc Wullaert]

Karl,

you can not use a 1:1 balun on this antenna!!
You need a 4:1 balun.To check swr on the old balun
just put a 200 ohm resister on the terminals and check with your
analyzer ..shoud gave from 10mhz a good value !
I shoud leave the antenne on the tower and first install the 4:1 balun!

marc on4ma



----- Original Message -----
From: "Karl Bullock" <karl at dixie-net.com>
To: <towertalk at contesting.com>
Sent: Tuesday, August 09, 2005 6:03 PM
Subject: Re: [TowerTalk] KT-34A Tuning Problems


>
>
> OK, thanks!  I'll pull her down and try that (obviously I missed this in
> the archives).
>
> On the analyzer issue, I wasn't as much looking at the impedance as I was
> the SWR.  Also, on the 10M band (since 29.35 MHz is the only resonant
> point still in the ham bands), the SWR on both my TS-440's internal
> meter, and on the tuner I've been using, show a 1.6:1 match with my
> homemade coax balun (a 1:1 balun).  While that'd be close enought for me,
> once tuned correctly, I'm assuming I'll need the 4:1 balun at that point.
>
> I'm also not sure the original balun is good at this point.
>
> Thanks for the hint.  I'll get back to 'yall....
>
> Karl, WA5TMC
>
> On Tue, 9 Aug 2005, David O Hachadorian wrote:
>
> > Connect a dc ohmmeter between the 10 meter and 15
> > meter trap capacitor outer tubes on each element half.
> > After correcting for ohmmeter lead resistance, the
> > total resistance should be less than 0.5 ohm. This
> > one measurement tests all of the critical connections
> > on each element half.
> >
> > Then connect the ohmmeter across the two halves of
> > the rear driven element. Once again, it should read
> > less than 0.5 ohm. This one measurement tests all
> > the connections through the phasing straps, matching
> > assembly and balun.
> > -------------------
> > That's a 4:1 balun on there, so when you fed the antenna directly with
> > coax, the swr went very high, right? Try using a real swr bridge instead
> > of the analyzer. Make sure the antenna is high enough during these test
> > measurements.
> >
> >
> >
> > Dave Hachadorian, K6LL
> > Big Bear Lake, CA
> > _______________________________________________
> >
> > See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any
questions and ask for Sherman, W2FLA.
> >
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> >
>
>
> _______________________________________________
>
> See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any
questions and ask for Sherman, W2FLA.
>
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> http://lists.contesting.com/mailman/listinfo/towertalk
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