[Elecraft] KX2 ATU question

[Harry Yingst]

I have the T1 and the KAT2 fot the K2  the KAT2 seems to also be a better tuner.
But the T1 is still a good tuner.



-------- Original message --------
From: Mike Morrow <kk5f at earthlink.net> 
Date: 2017-03-27  9:53 PM  (GMT-05:00) 
To: Elecraft Reflector <elecraft at mailman.qth.net> 
Subject: Re: [Elecraft] KX2 ATU question 

A tabular summary of the various Elecraft ATU characteristics was made by me here on 24 May 2016.  Next is the posting with the tabulation, attached below a response from Wayne with important KXAT2 design remarks, compared to the T1:
 
  http://mailman.qth.net/pipermail/elecraft/2016-May/232436.html

In summary, both the KXAT2 and the T1 ATUs use 7 inductors and 7 capacitors in an L-network low-pass filter, where the capacitor array may be switched to either side of the inductor array.  That gives 32764 unique configurations for both ATUs.  However, the T1 must use those 32764 between 160m and 6m, while the KXAT2 uses its 32764 between 80m and 10m only.  Thus, within the KXAT2's reduced frequency range, it performs more precisely to generate a match, compared to the T1 between 80m and 10m.

Bottom line:  The KXAT2 is superior to the T1 over the KX2's operating frequency range.

Mike / KK5F

-----Original Message-----
>From: w7aqk <w7aqk at cox.net>
>
>A while back, some enterprising person had posted a rather nice summary of 
>all the Elecraft ATU's showing numbers of tuning combinations, etc.  I can't 
>find it now, but maybe someone can post it again.  It may have been here on 
>this reflector, or otherwise, on the KX3 reflector.
>
>As I recall, the KX2 ATU had slightly fewer combinations, but only because 
>160 and 6 meters were not included on the rig.  Thus it was deemed to 
>perform nearly identically to the K3 and KX3 ATU's, and seems to do that 
>based on my usage.
>
>The T1 also had fewer combinations than the K3, but I think shows very 
>similar to the KX2.  My guess is that you would find the KX2 ATU to do a 
>competent job in comparison to the T1.  It is a very worthy addition to the 
>rig.
>
>Dave W7AQK
>
>From: Dave Fugleberg <dave.w0zf at gmail.com>
>
>How does the optional internal ATU for the KX2 compare to the Elecraft T1
>ATU in terms of tuning range? In other words, if a given length of wire
>works well with the T1, can one expect it to work with the KX2 internal
>tuner?
>
>I have a T1, but not a KX2 (at least not yet).
>Is  it  a similar design?
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