[Elecraft] K3 low power on 10m - was Wattmeter Calibration

[Dave G4AON]

I don't know if others have experienced this issue, but from previous 
postings on low power on 10m it's possible...

My K3/100 has the KAT3 auto ATU fitted, when I have the ATU in bypass 
and use the antenna 1 socket (as you are asked to when setting up the 
K3's power calibration), there is a residual SWR when on the 10m band. 
If I select antenna socket 2 there is no residual SWR. I've seen as high 
as a 1.7:1 SWR, which not surprisingly results in lower power on 10m 
unless I use the internal ATU.

Anyone else seen this?

73 Dave, G4AON
K3/100 #80