Bob,
Yeah, I flashed to 2.13 from 1.75 this weekend, and at first things
seemed to be OK, but last night when running the 80M SSB net, I kept
having the tuning change unexpectedly and my KPA500 kept faulting out.
This was the issue I was seeing on 2.05, which caused me to move back to
1.75 several months ago. I had not had any recent issues on 80M until
re-flashing to 2.13. It got so bad, that at some point, the K4D stopped
putting out ANY power, and I had to re-boot the K4D to get my power
back. I don't use the TUNE LP, but rather hit the TUNE button on the
KAT500, then tap TUNE on the K4D to start the tuning cycle. The K4D ATU
is bypassed.
No, I haven't erased all my KAT5000 tune memories - that would entail a
lengthy re-learning process that I was not keen to do, yet.
There is definitely a change in tuning behavior going from 1.75 to 2.13,
and at least for me, it's definitely NOT an improvement.
73,
-- Dave, N8SBE
On 2023-09-25 00:05, Bob Wilson - N6TV wrote:
Are you holding down TUNE LP for the entire tune cycle, waiting for a
match? That's not how it works.
Also, did you try clearing tuner memories as I previously suggested?
Or using a dummy load? It may help since the tuner may start the
search at a poor match solution from memory.
Does the same problem happen if you use CW mode or FSK mode to produce
a carrier (tap XMIT in FSK)?
If so, and if the K4 ATU bypassed, it sounds like you have found a new
bug in the new KAT500 firmware that cannot be resolved by posting to
this group.
Anyone else here using KAT500 Beta firmware 2.13? Do you see the same
problem?
Please report all the details to Elecraft support. They may ask for a
log trace if the KAT500 supports that.
Good luck.
73,
Bob, N6TV
On Sun, Sep 24, 2023, 8:48 PM Dave Barnes - WB4KDI
wrote:
Bob the KAT500 tuner works perfectly with firmware 175. Firmware 213
seems to converge to an asymptotic reactance instead of 50 ohm match.
The bad reactance is what causes the K4 to abort the tune cycle. The
KAT500 stays in tune unless I clear it.
I've checked everything else numerous times. Yes the K4 tuner can
find a match always with no problem,
Bob, the only thing I am changing is the KAT500 firmware. No cables
or settings on the K4 are changed.
Getting the hi swr message for tune mode and aborting the K4 tune
cycle is going to make it very hard to use an external tuner
automatic or otherwise. What does the K4 need to do about high swr in
tune mode?
Unless there were some hardware changes to the KAT500 that I am
unaware I suspect the KAT500 2xx firmware has a serious bug.
73,
Bob, N6TV
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