I'm using a QMX+ with the CR2032 installed and "QMX+ RTC" selected.
The problem is with the accuracy of the clock when the unit isn't switched on.
AFAICT, it's pretty accurate when the radio is operating in WSPR mode: it can run happily for several days at a time without any GPS input. However, if the unit's not powered up, the clock goes fast very quickly - I put the radio away for a few days and find the clock is several minutes fast, roughly 30 seconds a day. :-(
The 25MHz reference oscillator is virtually spot on: I've checked it using Hans's 20m WSPR tools (checked with both tx and rx), tweaked it a tiny bit (7Hz) and now everything's almost perfect.
Similarly, I've checked the CR2032's connections, cleaned the contacts and that seems well: the cell gives 3.15 volts measured at the PCB (healthy enough, surely?).
I find the on-screen time display helpful for logging purposes - I don't want to have to connect up the GPS or manually set it every time I leave the rig unused for a few days. What's up? How can I improve the accuracy?
73 Mark G?OIW
Mark Palmer