[Elecraft] TX Gain calibration fails

[dl7jp at gmx.net]

Hi,

I tried to go through TX Gain calibration on my K3 (after VCO MD cal), but
it fails (see below). Does anyone have an idea what to do in this case?

73, Joachim DL7JP

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Elecraft K3 Utility Revision 1.15.8.18
OS Version 6.2 Build 9200 Windows 8
K3 MCU revision 05.67. RS-232 speed 38400 bit/s.
Starting 5 watt calibration
Calibrating at 1.900 MHz
Calibrating at 3.750 MHz
Calibrating at 5.336 MHz
Calibrating at 7.150 MHz
Calibrating at 10.125 MHz
Calibrating at 14.200 MHz
Calibrating at 18.110 MHz
Calibrating at 21.200 MHz
Calibrating at 24.930 MHz
Calibration power settled at "  4.5 W ;"
Tx Gain calibration failed because transmit power did not reach the expected
value
5 watt calibration failed
Elapsed time: 47 seconds

Elecraft K3 Utility Revision 1.15.8.18
OS Version 6.2 Build 9200 Windows 8
K3 MCU revision 05.67. RS-232 speed 38400 bit/s.
Starting 50 watt calibration
Calibrating at 1.900 MHz
Calibrating at 3.750 MHz
Calibrating at 5.336 MHz
Calibrating at 7.150 MHz
Calibrating at 10.125 MHz
Calibrating at 14.200 MHz
Calibrating at 18.110 MHz
Calibrating at 21.200 MHz
Calibrating at 24.930 MHz
Calibrating at 29.000 MHz
Calibrating at 52.000 MHz
Calibration power settled at "  38 W ;"
Tx Gain calibration failed because transmit power did not reach the expected
value
50 watt calibration failed
Elapsed time: 49 seconds

K3 Tx Gain Calibration data written on 2021-12-30 at 18:45:57
K3 Serial Number 07445
K3 MCU revision 05.67. RS-232 speed 38400 bit/s.
Elecraft K3 Utility Revision 1.15.8.18
1900 kHz TxGain LP  64
3750 kHz TxGain LP  19
5336 kHz TxGain LP  35
7150 kHz TxGain LP  54
10125 kHz TxGain LP  56
14200 kHz TxGain LP  12
18110 kHz TxGain LP  23
21200 kHz TxGain LP  42
1900 kHz TxGain HP  25
3750 kHz TxGain HP  32
5336 kHz TxGain HP  40
7150 kHz TxGain HP  33
10125 kHz TxGain HP  27
14200 kHz TxGain HP  12
18110 kHz TxGain HP  10
21200 kHz TxGain HP  06
24930 kHz TxGain HP  08
29000 kHz TxGain HP  04