[Elecraft] K3 SWR tuning indication?

[Jim Miller]

I've had a habit of reducing my power to 2W when tuning. I've noticed
for a long time that the SWR indication at minimum when tuning my
remote T1 never went below 1.2:1. No big deal but always made me
wonder what was going on.

A few minutes ago I was playing with the ATU functions again with a
50ohm dummy load and the ATU always made it to 1:1. Yet when I went to
bypass I again got 1.2:1.

Then I remembered that the ATU always tunes at a preset of 5W. I
changed my TUN PWR when in bypass to 5W and got 1:1 after all.

It seems from this that the SWR bridge and its a/d conversion must be
calibrated only at (or above) 5W.

Is that correct?

73

jim ab3cv