Jack,
I could not sleep this evening, so played with the sbitx code.? It turns out that si5351v2.c line 45 needs to be uncommented, and line 46 commented.? Then you get to play with the value of the crystal.
The value provided was way too high for the Si5351 board that I had.? The final value after playing with it is 25002715.? I used WWV to measure the frequency.? The band scope and waterfall make it easy to see the center frequency.? You line up the beak to be on the 10MHz readout.? This was easiest for me to set the frequency span to 0 to 2400 Hertz.? The red line is then centered on the peak of the WWV signal.? I multiplied the error by 3.75 and then added or subtracted to the setting depending on the error being high or low.
I had to reboot, shut down, and restart several times to get the setting to take.? That does not make sense to me as I did build the software after I changed a value.? At times there was no change.? On other reboots, the audio codec would not start properly and caused the sbitx program to abort.? There are still mysteries about this design that I do not understand.
I am going to work on the PWR/SWR meter next.? Once I get that working and calibrated, I will test the rig over time to see if the TCXO is needed for how I use the radio.
73
Evan
AC9TU
