[TowerTalk] KT-34A Tuning Problems

[Marc Wullaert]

Yes go for a new 4:1 balun.

----- Original Message -----
From: "Karl Bullock" <karl at dixie-net.com>
To: <towertalk at contesting.com>
Sent: Tuesday, August 09, 2005 8:52 PM
Subject: Re: [TowerTalk] KT-34A Tuning Problems


> Well, therein lies part of the problem.  The balun does not check good
> on the analyzer, and I don't have another 4:1 balun to try on it.  The
> beam's on a 50' fold-over tower, and it's a chore to crank it down, then
> back up again.
>
> When I checked with just the coax (no balun), I didn't notice the
> impedance, only the resonance points (should have in retrospect), and
> the antenna was about 25' off the ground at a 45 degree angle at the
> time (cranked half-way up)
>
> Would your (collective) advice be to wait until I have a 4:1, then
> install and check it?
>
> Thanks also to K6II for his reply.
>
> Karl, WA5TMC
>
> Marc Wullaert wrote:
>
> >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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> >>
> >>
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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.
> >
> >_______________________________________________
> >TowerTalk mailing list
> >TowerTalk at contesting.com
> >http://lists.contesting.com/mailman/listinfo/towertalk
> >
> >.
> >
> >
> >
> _______________________________________________
>
> 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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