I tried to do some RTTY on the KX3 for Field Day but the radio wouldn’t key up. Many months later I thought to look into it, and everything worked fine. Set up for PSK31 on 20m at 5w and got a qso with the Dominican Republic on the first call. Replied to an Olivia 8/250 call from Texas and wasn’t being heard well (qsb and qrm), then discovered my LIFePo battery was dead and the radio was chugging along on 8v from the internal AAs.
still not sure what happened on Field Day, but happy the equipment is ok.