[Elecraft] K3 1 mW tx calibration fails

[Pierfrancesco Caci]

Hello,
I'm trying the 1 mW tx calibration and it fails like this:

Elecraft K3 Utility for Linux Revision 1.13.4.15
K3 MCU revision 04.81. RS-232 speed 38400 bps.
Starting 1 milliwatt calibration.
Calibrating at 1.900 MHz
Calibrating at 3.750 MHz
IsSamplingComplete: Unexpected response 'DB 2.08 MW;' to ''.
Calibration power settled at ' 2.08 MW;'
1 milliwatt calibration failed.
Elapsed time: 25.2 secs

Any clues?

The dummy load I've connected is flat at 51 Ohm all throughout the
range (tested with miniVNA).

Pf

-- 
Pierfrancesco Caci, ik5pvx