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KXPA-100 tuner question.

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Bob N3MNT

KXPA-100 tuner question.

I recently replaced/ upgraded the coax and balun on my Off center dipole and
no longer have to ability to get a 1:1 match using the tuner. I know it is
OCD (no pun intended) but I have always been able to get 1:1 with the
tuner.
Details:
Operating on low end of 80M 3.563M
Measuring the antenna / coax at shack shows 1:1.7 on swr meter ( actual
several).
KXPA-100 tuner will tune to 1:1.3 at best.
Values used by tuner C = 300 L= 0.
I assume this is due to the tuning steps ( granularity) and I know I should
not be concerned but would like to resolve it. Any suggestions on fooling
the tuner to move to a better LC selection.

--
Sent from: http://elecraft.365791.n2.nabble.com/
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Dick Dievendorff-4

Re: KXPA-100 tuner question.

Bob: the KXPA100 Utility operate page should have check boxes for manual selection of L and C. There is also an edit box with up and down arrows to change L and C one step at a time. See if you can wiggle those to a place that better suits you. There is a save button once you’ve reached Nirvana.

It may not be possible to get to 1:1.00 on every freq with fixed sized inductors and capacitors.

Not all of the L and C are useful on any particular band. The largest are not used on 6 meters, the smallest don’t make much difference on 160 meters.

You’ll hear this from others, but a minor mismatch isn’t going to make much difference at the other end of the QSO. But I, too, try to minimize this...

73 de Dick, K6KR

> On Nov 20, 2020, at 17:58, Bob N3MNT <[hidden email]> wrote:
>
> I recently replaced/ upgraded the coax and balun on my Off center dipole and
> no longer have to ability to get a 1:1 match using the tuner. I know it is
> OCD (no pun intended) but I have always been able to get 1:1 with the
> tuner.
> Details:
> Operating on low end of 80M 3.563M
> Measuring the antenna / coax at shack shows 1:1.7 on swr meter ( actual
> several).
> KXPA-100 tuner will tune to 1:1.3 at best.
> Values used by tuner C = 300 L= 0.
> I assume this is due to the tuning steps ( granularity) and I know I should
> not be concerned but would like to resolve it. Any suggestions on fooling
> the tuner to move to a better LC selection.
>
>
>
>
> --
> Sent from: http://elecraft.365791.n2.nabble.com/
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

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George Danner-2

Re: KXPA-100 tuner question.

Bob,
According to my KXPA100 manual (A2-2013) - "... tap *tune* again within 5
seconds. The ATU will do a second tune using smaller steps in inductance
and capacitance values."
All my Electraft ATUs have a similar feature. Downside - It does take much
longer to achieve the match.

73
George AI4VZ

On Sat, Nov 21, 2020 at 7:47 AM Dick Dievendorff <[hidden email]> wrote:

> Bob: the KXPA100 Utility operate page should have check boxes for manual
> selection of L and C. There is also an edit box with up and down arrows to
> change L and C one step at a time. See if you can wiggle those to a place
> that better suits you. There is a save button once you’ve reached Nirvana.
>
> It may not be possible to get to 1:1.00 on every freq with fixed sized
> inductors and capacitors.
>
> Not all of the L and C are useful on any particular band. The largest are
> not used on 6 meters, the smallest don’t make much difference on 160 meters.
>
> You’ll hear this from others, but a minor mismatch isn’t going to make
> much difference at the other end of the QSO. But I, too, try to minimize
> this...
>
> 73 de Dick, K6KR
>
> > On Nov 20, 2020, at 17:58, Bob N3MNT <[hidden email]> wrote:
> >
> > I recently replaced/ upgraded the coax and balun on my Off center
> dipole and
> > no longer have to ability to get a 1:1 match using the tuner. I know it
> is
> > OCD (no pun intended) but I have always been able to get 1:1 with the
> > tuner.
> > Details:
> > Operating on low end of 80M 3.563M
> > Measuring the antenna / coax at shack shows 1:1.7 on swr meter ( actual
> > several).
> > KXPA-100 tuner will tune to 1:1.3 at best.
> > Values used by tuner C = 300 L= 0.
> > I assume this is due to the tuning steps ( granularity) and I know I
> should
> > not be concerned but would like to resolve it. Any suggestions on
> fooling
> > the tuner to move to a better LC selection.
> >
> >
> >
> >
> > --
> > Sent from: http://elecraft.365791.n2.nabble.com/
> > ______________________________________________________________
> > Elecraft mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:[hidden email]
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> > Message delivered to [hidden email]
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

Bob N3MNT

Re: KXPA-100 tuner question.

I have tried the second quick tap. It worked with the old ant/coax but
offers no improvement now. Breaking out the VNA tomorrow.
Thank you to all who helped.

--
Sent from: http://elecraft.365791.n2.nabble.com/
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