Thanks, Wayne.
73,
Scott K9MA
On 6/16/2018 16:35, Wayne Burdick wrote:
Scott,
Every ATU design has different stray amounts of L and C. But the differences
are small between the KPA1500 ATU and our other ATUs, especially the
battlefield-proven KAT500, which has a virtually identical circuit.
Scott,
Every ATU design has different stray amounts of L and C. But the differences
are small between the KPA1500 ATU and our other ATUs, especially the
battlefield-proven KAT500, which has a virtually identical circuit. We test the
ATUs into various loads to verify matching range.
That said,
I've also noticed that the ATU often doesn't get a very good match, even
if I try twice as per the manual. The K3 ATU, by contrast, usually
finds a much better match for the same load. (Not talking high load SWR
here, less than 2:1.) I haven't compared the component values in the
two ATU's,
It seems I can get a much better SWR by manually changing the L/C
settings. However, I have not figured out how to store those manually
entered settings; it always returns to the auto setting (as
demonstrated by changing bands and then changing back ).
Anybody know how to do this?
- Paul
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