When you use the GPS module the U3S can run a calibration routine, but rather than base the result on your operational transmit frequency you can specify a much higher frequency for the DDS to run at and get a more accurate compensating value at the end of the routine. I think I've got that right, but it is well documented by Hans.?
I have the park frequency set to ~130 MHz and try to run the calibration interval for somewhere between 2-3 minutes. I don't slew the offset very much and have it set for 2 or something like that.
Again, the software manual covers it pretty well.
73
Al Holt
WD4AH
