I built the KAT100-1 autotuner for my K2/100 and it tested and worked great. I am running it and the K2/100 off a marine battery with a 1.5amp charger and I had made a Y on the K2/100 power cable to power the tuner. On a few occasions I carried both to a different location the tuner began to act strangely but after returning it to my QTH it would behave fine.
This weekend I took both to field day and connected to a large battery that had 12.5 volts, measured, and when I hit "tune" the tuner began working and then blew the fuse on the power cord feeding the K2/100 and tuner. After checking connections and replacing the fuse the tuner would behave correctly as to switching the radio from high to low power, behave correctly for switching from antenna A to B, but when hitting the tune button the LEDs seemed to show the SWR but the relays would not click and not tune. I switched bands with the same result. We disconnected the tuner, put a manual tuner in its place, and operated the K2/100 for field day.
Brought my gear home, opened and looked it over carefully, went back through the re-alignment steps, went through the menu and checked each relay with everything checking out fine. I did notice that the menu setting for ATU was on CAL instead of AUTO and do not have a clue how it got changed. Put it back on AUTO and the tuner is home working fine (except on 160m not all LEDs to the left light up like the other bands do, just one LED moves around showing the SWR level) but.... I still am not sure it is "right". I do not understand why it behaves correctly at home but does not when I take it somewhere else. This makes the 4th time it has done this and the only thing that comes to mind is that my home battery is showing around 13v and the other batteries I have connected to are around 12 to 12.5? One time it was a power supply and I do not know what its voltage was. Any ideas?
KD5SHM
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