After years of non-use, I've got my IC-910H CIV fixed and antennas back in service.

I've noticed when trying to calibrate my uplink frequency by hitting the "Swap 0" button, it sometimes does not stay ON, but rather reverts back to the frequency display rather than the -------'s it normally displays while I'm tuning. Sometimes this happens as soon as I start tuning or after a few seconds.

Shouldn't the display stay blanked until I hit the Swap 0 button again?

Well, as I'm typing this question I had a thought. Maybe I should turn off the CAT tuning while zero beating. Maybe CAT is what's turning the display back on.

I'll have to wait for Field Day to try it out as I've got the truck packed with all my equipment now.

Joe - KC2TN