Re: [Elecraft] KX2 ATU question

[Harry Yingst via Elecraft]

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 <k...@earthlink.net> 
Date: 2017-03-27  9:53 PM  (GMT-05:00) 
To: Elecraft Reflector <elecraft@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 <w7...@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.w...@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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Re: [Elecraft] KX2 ATU question

[Mike Morrow]

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 
>
>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 
>
>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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Re: [Elecraft] KX2 ATU question

[w7aqk]

Dave and All,

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 

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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Re: [Elecraft] KX2 ATU question

[Bill Johnson]

Linas, great review and answer.  I also owned both.  I found the T-1 to be 
fine; but for portable, just one more piece of equipment and more wires.  I 
have the KX2 and have used in the station so far and its tuner is super for the 
station needs.  Once it warms up will hit the trails.  The T-1 is excellent, 
better than the competition in my experience.  The K3 tuner has larger 
components and thus will tune much more logically.  Enjoy the Kx2 when you get 
it.  It is super.  I can grab and antenna, plug in the dragging counterpoise, 
and go walking with nothing else... you really cannot beat that with a stick!!!

73,
Bill
K9YEQ

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Irma & 
Linas(LY2H)
Sent: Monday, March 27, 2017 5:00 PM
To: Dave Fugleberg <dave.w...@gmail.com>; Elecraft List 
<elecraft@mailman.qth.net>
Subject: Re: [Elecraft] KX2 ATU question

Dave,
Pretty much the same  to my experience. I have the T-1 for some 10 years and 
the KX-2 with the ATU installed for some 1 month, :). May be too early to make 
judgements but both tuners were  equally good in tuning the random wire of some 
9 m, also a 12m length vertical dipole fed by the 400 ohm open air line through 
the current balun. Both managed to tune it from 40 to 10 meters except of 80. 
The tuner of my K3 made it also into 80m ( almost no practical use but still 
the K3 tuner proved to be very capable, :). Except the extreme situations like 
this or the 1/2 wavelenght antennas the both small tuners doing extremely well. 
I would higly recommend the ATU option for the Kx2 since  this is a very 
protable rig and the ATU is a must in situations like hotel rooms etc. At the 
moment I am using it every day with greate success in my mobile setup tuning 
the base-load mobile whip ( 1.25 m
lenght) made of a junk-box loading coil and the whip stolen from the VHF
5/8 antenna. During  every 20min trip to work and back I make 1-3 QSO's incl 
even some stns from USA, Canada, Asian Russia and EU islands like Crete. I am 
very much content with this in-built tuner!

73! Linas LY2H

On 2017 kov. 27, pr at 22:06 Dave Fugleberg <dave.w...@gmail.com> wrote:

> 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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> irmalina...@gmail.com
>
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Re: [Elecraft] KX2 ATU question

[Irma & Linas(LY2H)]

Dave,
Pretty much the same  to my experience. I have the T-1 for some 10 years
and the KX-2 with the ATU installed for some 1 month, :). May be too early
to make judgements but both tuners were  equally good in tuning the random
wire of some 9 m, also a 12m length vertical dipole fed by the 400 ohm open
air line through the current balun. Both managed to tune it from 40 to 10
meters except of 80. The tuner of my K3 made it also into 80m ( almost no
practical use but still the K3 tuner proved to be very capable, :). Except
the extreme situations like this or the 1/2 wavelenght antennas the both
small tuners doing extremely well. I would higly recommend the ATU option
for the Kx2 since  this is a very protable rig and the ATU is a must in
situations like hotel rooms etc. At the moment I am using it every day with
greate success in my mobile setup tuning the base-load mobile whip ( 1.25 m
lenght) made of a junk-box loading coil and the whip stolen from the VHF
5/8 antenna. During  every 20min trip to work and back I make 1-3 QSO's
incl even some stns from USA, Canada, Asian Russia and EU islands like
Crete. I am very much content with this in-built tuner!

73! Linas LY2H

On 2017 kov. 27, pr at 22:06 Dave Fugleberg  wrote:

> 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?
> __
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to irmalina...@gmail.com
>
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[Elecraft] KX2 ATU question

[Dave Fugleberg]

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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