[Elecraft] KX3 TX calibration failure on 52 MHz

[w7hd at msn.com]

Also check your cable to the dummy load.   I had exactly the same 
symptoms and it was due to a poor ground on the coax.

Ron W7HD


Tuck Watkins wrote:
> The problem is the KX3 TX calibration is failing on 52 MHz at 4.0 W. I
> would appreciate some advice on how to proceed with diagnosis and
> correction.
>
> First the basic background information: KX3 #8094. Firmware versions:
> MCU = 2.33, MCU = 1.33. I'm running the KX3 configuration utility Ver.
> 1.14.4.11 on Linux Mint 17.2
> [uname -a =>  3.16.0-38-generic #52~14.04.1-Ubuntu SMP Fri May 8 09:43:57
> UTC 2015 x86_64 x86_64 x86_64 GNU/Linux ].
>
> To calibrate I did the following:
>
> I attached a suitable 100W dummy load to the KX3. Then I ran the KX3
> configuration utility. I executed the TX Calibration Gain. It runs fine
> with no errors until it reaches 52 MHz. The relevant lines with the
> failure message on the computer screen are:
>
>      Calibrating 52.000 MHz
>      TxGainStartTune Invalid response to "TQ;"
>      Calibration failed
>
> I then decided to try the TX calibration instructions in the KX3 manual.
> As with the KX3 utility all went well except for the 4.0 W at 52 MHz
> test. When I got to 4.0 W on 52 MHz it appeared that the output was
> stable. That is the 4.0 W was holding steady. When I pressed the button
> to turn off the tuning the message in VFO A displayed was "d=017." The
> message in VFO B was "ERR TXG." I repeated the test at 4.0 W. The
> message in VFO B stayed the same. The message in VFO A changed to
> "d=042." A third attempt produced "d=046" message in VFO A. VFO B had
> the same "ERR TXG" message.
>
> I then ran the test at 6.0 W. There was no error. The error does not
> suggest what to do next. Any advice would be appreciated.
>
> Thanks all,
>
> Tuck, W6TUK
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OMISS#9898 Linuxuser#415320 NAQCC#7587
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