The KAT3, KAT500, KPA1500 tuners, all have the same feature. I have all
three.
If you want a finer (lower SWR) value, within a few seconds of the first
tuning cycle stopping, start the sequence a second time and the tuner
will cycle through ALL possible settings to attempt a lower match. It
may/not make a difference.
I would also, at this point, seek out an antenna analyzer to see what
data could be gleaned from that; perhaps a cable, connector or other
antenna system element (anything beyond the tuner, even IN the radio) is
no longer valid. Tuning into a KNOWN 50 ohm dummy load may show
something interesting as well.
Again, setting CONFIG | TUN to 10 (watts), should help resolve your
issue, 5 watts is a touch low. If it does not, you may have a failed
component (or relay) in the tuner.
If you can, try to eliminate the possibilities (antenna, feed,
connectors) to find out what failed/changed; narrow the search. (Does
another radio tune the antenna easily, EVERY time?)
73,
Rick NK7I
On 12/7/2021 3:13 PM, Fred Jensen wrote:
The KAT500 will enter a fine-tune mode if you re-initiate a tune cycle
right after the first one has finished. I don't know if the KAT3 will
do that, and I can't test it because mine always finds the primary
match the first time, but Elecraft would have a lot of incentive to
reuse KAT3 algorithms and code in the KAT500. I believe the Elecraft
tuners use some variant of the steepest descent algorithm which can
hang up on a less than optimal solution
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
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