K3 KAT3 Antenna Tuner Tutorial

[Julius Fazekas n2wn]

Windy,

The latest QST has an article on window feed line that discusses this very topic
Julius Fazekas
N2WN

Tennessee Contest Group
http://www.k4ro.net/tcg/index.html
http://groups.google.com/group/tcg1?hl=en

Tennessee QSO Party
http://www.tnqp.org/

Elecraft K2/100 #4455
Elecraft K3/100 #366
Elecraft K3/100 #1875
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[David Gilbert]

Yes, and it is a quite poorly done article with various procedural
errors and measurement inconsistencies.  I recommend you ignore it.  See
the message thread initiated by W8JI in the Elmers forum on eHam for
more discussion about it.

73,
Dave   AB7E



Julius Fazekas wrote:
> Windy,
>
> The latest QST has an article on window feed line that discusses this very topic
> Julius Fazekas
> N2WN
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[Bob Nielsen-2]

Wes, N7WS has a paper on window line which is much more informative:  
<http://users.triconet.org/wesandlinda/ladder_line.pdf>.

Bob, N7XY

On Oct 22, 2009, at 10:15 AM, Julius Fazekas wrote:

> Windy,
>
> The latest QST has an article on window feed line that discusses  
> this very topic
> Julius Fazekas
> N2WN
>
> Tennessee Contest Group
> http://www.k4ro.net/tcg/index.html
> http://groups.google.com/group/tcg1?hl=en
>
> Tennessee QSO Party
> http://www.tnqp.org/
>
> Elecraft K2/100 #4455
> Elecraft K3/100 #366
> Elecraft K3/100 #1875
> ______________________________________________________________
> 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

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[Bill K9YEQ]

See Pg 66.


73,

Bill
K9YEQ


-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Julius Fazekas
Sent: Thursday, October 22, 2009 12:16 PM
To: [hidden email]
Cc: Elecraft Discussion List
Subject: [Elecraft] K3 KAT3 Antenna Tuner Tutorial

Windy,

The latest QST has an article on window feed line that discusses this very
topic
Julius Fazekas
N2WN


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[KM5Q]

Sure Bill. When feedline is wet, I alter some band segments by  
retuning as needed, as I operate. Then when dry, I encounter the re-
tuned segments again when I encounter a high-SWR after I QSY. So then  
I re-tune, of course. As far as I can observe, that seems to wipe out  
the "wet" setting that was recorded at some nearby frequency. Seems  
OK. I just have to accept that I don't know where the segments are,  
and so I keep an eye on the SWR when I QSY (normal habit anyway).

I'll await any more helpful info from the creators. I accept that it  
may be simple "just keep doing what you are doing". It isn't a  
problem, I'll await any further understanding of the rules that the  
ATU memories follow.

Thanks  /  Windy KM5Q


Bill K9YEQ wrote:
Thu, 22 Oct 2009 08:09:57 -0700

> Your feedline impedance changes when wet and the memory will change  
> in the
> tuner.  I would expect that is quite normal and a good thing!
>
>
> 73,
>
> Bill
> K9YEQ
> K2 #35; KX1 #35; K3 #1744; mini mods
> ATS-3B
>
> -----Original Message-----
> Subject: Re: [Elecraft] K3 KAT3 Antenna Tuner Tutorial
>
> Fellows,
> I'm not asking you to go off-topic with advice on my feedline. I'm
> asking only about the behavior of the ATU memory system after I've
> retuned a few band segments to wet condx, then condx return to dry.
>
> Thanks
> Windy

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[Bill K9YEQ]

Windy,

I usually push the ATU tune whenever I change bands but have never relied
upon the tuner to manage.

Here's the manual:

        ATU (KAT3)
If you have the KAT3 antenna tuner installed, you
can select ANT1 or ANT2 by tapping ANT .
Hold ATU to select AUTO (autotune enabled) or
BYPASS. If the ATU icon is on, the antenna can
be matched for best SWR by tapping ATU TUNE .
Up to 30 ATU settings are saved for both antennas
on every band. The ATU icon will flash briefly
whenever new settings are automatically loaded.
Tapping ATU TUNE a second time within 5
seconds of a match attempt will retry using a more
extensive search. This may improve the match
when using high-SWR or narrow-band loads.

I don't believe this answers the question as to when the tuner invokes an
automatic retune, however.


73,

Bill
K9YEQ


-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of KM5Q
Sent: Thursday, October 22, 2009 2:02 PM
To: [hidden email]
Subject: Re: [Elecraft] K3 KAT3 Antenna Tuner Tutorial

Sure Bill. When feedline is wet, I alter some band segments by  
retuning as needed, as I operate. Then when dry, I encounter the re-
tuned segments again when I encounter a high-SWR after I QSY. So then  
I re-tune, of course. As far as I can observe, that seems to wipe out  
the "wet" setting that was recorded at some nearby frequency. Seems  
OK. I just have to accept that I don't know where the segments are,  
and so I keep an eye on the SWR when I QSY (normal habit anyway).

I'll await any more helpful info from the creators. I accept that it  
may be simple "just keep doing what you are doing". It isn't a  
problem, I'll await any further understanding of the rules that the  
ATU memories follow.

Thanks  /  Windy KM5Q


Bill K9YEQ wrote:
Thu, 22 Oct 2009 08:09:57 -0700

> Your feedline impedance changes when wet and the memory will change  
> in the
> tuner.  I would expect that is quite normal and a good thing!
>
>
> 73,
>
> Bill
> K9YEQ
> K2 #35; KX1 #35; K3 #1744; mini mods
> ATS-3B
>
> -----Original Message-----
> Subject: Re: [Elecraft] K3 KAT3 Antenna Tuner Tutorial
>
> Fellows,
> I'm not asking you to go off-topic with advice on my feedline. I'm
> asking only about the behavior of the ATU memory system after I've
> retuned a few band segments to wet condx, then condx return to dry.
>
> Thanks
> Windy

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