[Elecraft] Problem with KAT500 firmware v. 2.05

[Bob McGraw]

I don't find that to be the case with my KAT500.  Upgraded to 2.05 a 
couple of weeks ago.  I just ran 80M every 25 kHz from 3.525 to 3.975.  
The original memories and a few added show 1.0:1 on my K3S at all 
points.  The external SWR/PWR meter between the radio and tuner input 
agrees.  The antenna is resonant at 3.825 MHz and there is a 40M dipole 
from the same feed point.  There is a 1:1 current balun at the feed 
point and the feed line is 75 ft of RG-213.

73

Bob, K4TAX


On 1/2/2022 7:43 PM, elecraft-request at mailman.qth.net wrote:
> Message: 12
> Date: Sun, 2 Jan 2022 11:46:14 -0600
> From: Bart Campbell<ns4x.bart at gmail.com>
> To: Elecraft Reflector<elecraft at mailman.qth.net>
> Subject: [Elecraft]
> Message-ID:
> 	<CANZr5j0=JAbESua4PTYMABRd5AD03RgcDZfhQzoHqW-czALH-Q at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> I upgraded one of my KAT500 tuners to firmware version 2.05.  I had already
> upgraded the KAT500 utility to the current version, so no issues there.
> After the upgrade, the KAT500 is unable to find a tuning solution on my 80
> meter dipole.  My first thought was that there was an issue with the
> dipole, but I checked it with an AA-230 antenna analyzer and there was no
> change from previous measurements.  I then switched the upgraded KAT500
> with another KAT500 that I have which was running firmware version 1.75.
> It found a tuning solution on the dipole just fine, as has always been the
> case with the first KAT500 prior to the firmware upgrade.  So, I
> "downgraded" the updated KAT500 to firmware version 1.75 and it once again
> was able to easily find a tuning solution for the 80 meter dipole.  It
> seems that something in the tuning algorithm was changed in the latest
> firmware that affects the tuner's ability to find a tuning solution on 80
> meters (I did not notice this issue on other bands after I updated the
> firmware, but I concentrated my troubleshooting on the 80 meter dipole).
>
> Any ideas?  I really want to use the latest firmware to take advantage of
> the capability to accept transceiver TX frequency messages in Kenwood
> format.
>
> Bart, NS4X
>
>
> ------------------------------