[Elecraft] [K3] KAT3 not functioning on 6m

[Bill Coleman]

I upgraded my K3 to include the new KSYN3A back in November. (I have the KRX3, so I installed two of them)

Ever since then, it seems like the Antenna Tuner isn’t doing it’s thing on 6m. It works fine on the other bands.

The K3 doesn’t really show any other problems.

Here’s the symptoms:

- ATU not in bypass
- ANT1 or ANT2 - doesn’t matter.
- Press ATU Tune
- Unit makes noises like it is working on a match, but the entire time, the display only shows “- -“ in the right hand side of the display — at no time does it show an SWR.
- Eventually, unit gives up trying to find a match

What’s odd is this:

- Press Tune, unit outputs power, but no SWR is displayed in the right hand side of the display, only “- -“.

- However, if I transmit, I do see an SWR indication in the meter face, and the SWR seems accurate, depending on the antenna I choose. 

I’m running firmware revision 5.67/2.88 — which is the latest, I believe.

Any ideas?

Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr at arrl.net
Web: http://boringhamradiopart.blogspot.com
Quote: "Not within a thousand years will man ever fly!"
            -- Wilbur Wright, 1901