Evan,
The file that you provided is the same that I used. Unfortunately, in my previous email, I miss-typed the file (omitting "V5").
The file that I used is: UBITXV5_CEC_V1.200_NX_S.hex (86168 bytes).
Here is another thought... In my first attempt, to load the OEM software on a new Nano, I also made a copy of the OEM eeprom (using avrdude) and loaded it onto the new Nano. When I access that Nano with AJ6CU ubitx Settings Editor, the "factory calibration" data shows: Master Cal -1, SSB BFO 4294967295. The Settings Editor says this out of range and will not accept it. Therefore, I plugged in sample values (as shown in the Manual for the Settings Editor), to provide a start point (Master Cal 85351, SSB BFO 11056992). In my attempt to calibrate BFO, I spun the dial +/- 3000 or 4000 with no noticeable effect. Perhaps I didn't go far enough?
I'm wondering if the out of range OEM BFO setting is actually what is required for this SI5351A. Before posting anything on this forum, I sent an email to Ashar Farhan, to ask whether I might have damaged something by inserting the Nano with pins on wrong side of board (he didn't think so), and why I was having difficulty with calibrating BFO (using new Nano with OEM software). He asked when I had purchased the radio, saying that there was a batch of "finicky" SI5351A chips. I told him: "I bought the radio in early August from Gigaparts.com. The serial number on the box was 164688. The Raduino board bears a hand written number: 3541." (But I also said I was going to proceed with CEC Nextion mod, and hoped the setup would work better.) In any case, he did not respond as to whether my radio might have one of the finicky chips. Although I'd rather not change it, I'm beginning to think that's what's needed.
What do you think?
