KAT2 aligned and working but..

[JT Croteau]

So I just finished my KAT2 assembly and alignment.  I even just had a
nice QSO on 20M using my 40M dipole.  However, while the KAT2 reports
a nice 1.2:1 SWR and 5.6W POUT and 0.2 reflected, my external
wattmeter (Elecraft W1) is still showing a horrible match with the SWR
way off the scale.

Any ideas?

Thanks

--
JT Croteau, N1ESE - Manchester, NH (FN42gx)
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[JT Croteau]

On 10/5/07, Tree <[hidden email]> wrote:
> Perfectly expected.  The KAT2 is inside the K2 - and is just matching your
> bad SWR to the finals.  The bad SWR is still there outside the radio.

Yeah, I thought of this just after I posted.  Sometimes I don't get it
til I actually write out the problem.  Heh, thanks Tree.

--
JT Croteau, N1ESE - Manchester, NH (FN42gx)
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[Tom Hammond-2]

JT:

Your external wattmeter is BETWEEN the KAT2 and the antenna...!

The KAT2 is providing a match to the K2, NOT the external meter, which is
AHEAD of the KAT2 and in a place where no matching is being done.

Remember, the KAT2 does NOT "TUNE" the antenna/coax, it only provides a
conjugate match to the RADIO... so if you have a 3:1 SWR ON THE COAX,
it's still gonna be there AT THE EXT. meter, but at the K2, the KAT2
will have compensated it down to near 1:1.

73,

Tom Hammond   N0SS


At 13:04 10/05/2007, JT Croteau wrote:

>So I just finished my KAT2 assembly and alignment.  I even just had a
>nice QSO on 20M using my 40M dipole.  However, while the KAT2 reports
>a nice 1.2:1 SWR and 5.6W POUT and 0.2 reflected, my external
>wattmeter (Elecraft W1) is still showing a horrible match with the SWR
>way off the scale.
>
>Any ideas?
>
>Thanks
>
>--
>JT Croteau, N1ESE - Manchester, NH (FN42gx)
>_______________________________________________
>Elecraft mailing list
>Post to: [hidden email]
>You must be a subscriber to post to the list.
>Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft
>
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[Don Wilhelm-4]

JT,

Unless you have somehow placed the W1 between the K2 and the *input* to
the KAT2 (not an easy feat), you will not see any reduction of SWR on
the antenna transmission line.

The KAT2 (or any tuner for that matter) does not change the antenna, it
just adds inductance and capacity to reduce the SWR at *its* input - the
SWR at its output will remain the same.

So, no problem, what you are seeing is the expected behavior.  If you
feel you must reduce the SWR between the KAT2 output and the antenna,
you will have to work on the antenna itself.  If you are feeding with
coax, that may be a concern, but if you are feeding the antenna with low
loss parallel transmission line, all should be good.

73,
Don W3FPR

JT Croteau wrote:
> So I just finished my KAT2 assembly and alignment.  I even just had a
> nice QSO on 20M using my 40M dipole.  However, while the KAT2 reports
> a nice 1.2:1 SWR and 5.6W POUT and 0.2 reflected, my external
> wattmeter (Elecraft W1) is still showing a horrible match with the SWR
> way off the scale.
>
>  
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