[Elecraft] [K3} High SWR on 17 meters

[Dave KØEKL]

I attempted to do the TX gain calibration on my K3, S/N 1171 today but it fails with 2.2:1 SWR in 18 MHz.

I've tried both ANT1 and ANT ports on the K3, multiple different patch cables, and two different high-precision Cablewave dummy loads. With my LP-100A SWR meter in-line when testing it shows 1.02:1 while the K3 and the K3 utility say the SWR is 2.4:1.

What should ZI look at next?