The LDG tuner in the Orion does a fine job, I've found.
Duane Calvin
. . . sent from my Galaxy Tablet
On May 22, 2014 5:51 PM, "Jim Brown" <k9yc@audiosystemsgroup.com> wrote:
>
> Built in ATUs are OK but remote auto-tuners work better.
>>
>
> I question this statement, because it seems to be built on the assumption
> that excess loss in the mis-matched transmission line matters a lot more
> than it often does. I suspect that most hams using remote auto-tuners have
> a poor quantitative understanding of that loss, and may also be fooling
> themselves into believing that their antenna "works better" if they see a
> 1:1 SWR. I also suspect that many (most?) hams using remote auto tuners to
> tune wildly non-resonant antennas would be better off either by making
> those antennas closer to resonance, or by using a bigger coax between the
> antenna and the shack, or both. To get that quantitative understanding,
> study the family of graphs showing excess loss due to SWR in the
> Transmission Lines chapter of the ARRL Handbook.
>
> Another point -- how well a built-in ATU works depends a lot on its
> design. The TT rigs I've owned have not had them; the tuners in the Icom,
> Kenwood, and Yaesu rigs have been mediocre, but the tuners in the Elecraft
> K2 (their first), K3, and KX3, as well as their KAT500, are all quite good.
> Again, I believe that's because Wayne Burdick has always been a backpacker,
> so he understands what a tuner needs to be.
>
> 73, Jim K9YC
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