[Elecraft] KXAT2 vs. KXAT3 vs. T1

[Brian Hunt]

(edited message follows)

> On Oct 25, 2022, at 13:05, Brian Hunt <huntinhmb at coastside.net> wrote:
> 
> I believe the schematics, which are downloadable, will show the component values. They are typically a binary progression. I’ve never tabulated them though. 
> 
> Brian, K0DTJ 
> 
>> On Oct 25, 2022, at 10:16, Walter Underwood <wunder at wunderwood.org> wrote:
>> 
>> The KX3 has extra range so that it covers 160 m and 6 m compared to the KX2, which is 80 to 10 m. The T1 is spec’ed to cover 160 to 6 m, so I’m not sure about the details of that.
>> 
>> The KX3 might have a wider matching range on just the HF bands. I’ve only had it fail to match once.
>> 
>> A few years ago, there was a discussion on this list that gave all the component values for all the ATUs. I’m not having any luck finding those posts right now.
>> 
>> wunder
>> K6WRU
>> Walter Underwood
>> CM87wj
>> http://observer.wunderwood.org/ <http://observer.wunderwood.org/> (my blog)
>> 
>>>> On Oct 25, 2022, at 9:51 AM, Julia Tuttle <julia at juliatuttle.net <mailto:julia at juliatuttle.net>> wrote:
>>> 
>>> Hi folks,
>>> 
>>> I was looking at Elecraft's antenna tuners, and I'm a little confused at
>>> their specs.
>>> 
>>> The T1 and KXAT2 are listed as having 7L7C networks, while the KX3 is
>>> listed as having an 8L8C network, but all three are listed as being able to
>>> match up to a 10:1 SWR.
>>> 
>>> Why doesn't the KXAT3 have a wider matching range from the extra inductor
>>> and capacitor?
>>> 
>>> Is the 10:1 spec conservative and in reality all three can exceed it but
>>> the KXAT3 will outperform the other two? Do the eighth inductor and
>>> capacitor on the KXAT3 provide *closer* matches instead of a *wider*
>>> matching range?
>>> 
>>> Thanks and 73,
>>> 
>>> Julie
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>> 
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>