[Elecraft] [KX1] Auto-tuners for KX1

[Don Wilhelm]

Phil,

The T1 tuner has a greater tuning range than the KXAT1.  One cannot just 
simply say that a tuner will match a specific SWR - the characteristics 
of that particular SWR must be expressed in terms of resistance and 
reactance to totally answer your question.
Look at the maximum L and maximum C proveded by each tuner, and then 
apply those values to an L-network at the frequency of interest.

All tuners will have a greater matching range at higher frequencies, and 
the range will be compressed at lower frequencies.

So one must translate the SWR into resistance and reactive components 
(the values plot to a circle on the Smith Chart), and then see what 
values of C and L in an L network will bring that SWR to a 50 ohm point 
on the Smith Chart - if those values are within the maximum L and C 
values provided by the tuner, then that tuner will handle it - if 
outside those boundaries, a good match is not possible.

73,
Don W3FPR

Phil Hystad wrote:
> So, what is the better way to go.  There is the internal KXAT1 auto-tuner for $99 and then there is the external T1 auto-tuner for $136.
>
> Are these the same or equivalent tuners?
>
> What is the SWR range for these?  10:1, 5:1, or 3:1 or whatever?
>
> Is there an advantage to the KXAT1 other then the fact that it is internal?
>
> Thanks for any answers and comments.
>
> 73, phil, K7PEH
>
>
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