[Elecraft] KAT500 question

[Dick Dievendorff]

All full search tunes, whether started by manually pressing the TUNE button or an SWR-based autotune, store the tuning solution in memory.

I'd suggest you erase the tuner settings for 20 meters on the affected antenna connector KAT500 Utility configuration tab) and "train" the tuner by pressing TUNE and provide a 20 watt tune signal on a few frequencies across the band. You don't want remnants of the erroneous settings in those memories, or you'll keep finding them.

Then leave the ATU in mode MAN so that it selects from previously found tuning solutions as you QSY across the band.

As for how you got there - I can speculate, but I don't know anything about your path from ATU to antennas.  It probably matched a different impedance at some point in the past.  I might get that result here by having an external antenna switch in the wrong position and use the KAT500 to match my 15 meter beam on 20 meters, and then change my antenna switch. 

You probably don't want the ATU in mode AUTO very often.  After antenna configuration changes, erase the tuner memories on the affected bands, and tune at a few spots on the band.  Then let the ATU choose from those settings by frequency, which it will do in mode MAN.

73 de Dick, K6KR



> On Nov 29, 2014, at 06:17, <jsdroyster at nc.rr.com> <jsdroyster at nc.rr.com> wrote:
> 
> Our KAT500 (used with K3 and KPA500) seems to have forgotten its correct memories for the 20 m band or maybe developed new erroneous memories. It gives me 14 to 1 on autotune.  If I set it on manual and do a tune it reads 1.2 to 1.  So here is the question:  if I do manual tunes every so many MHz across the band will those go into memory, or is  the memory based only on autotunes? 
> 
> Also, any idea how this happened?
> 
> THANKS!
> Julie KT4JR
> 
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