Re: Hackathon results: working Rx

Hi all, Some good news for today. We've had a small fairwaves hackathon here in Moscow and we've done a good progress in UmTRX development. I'm quite exhausted, thus in short: 1. A software issue has been fixed in PLL tuning code. It works reliably now. Previously it didn't correctly handle edge cases when the best VCOCAP value was at the end of a range. 2. A software issue has been fixed in automatic LMS calibration code. Turns out a process described in the datasheet is not complete - you have read FAQ, question 4.7 for an amendment. 3. Now we correctly select Rx input. You have to change _two_ registers to do that - 0x75 and 0x25. This wasn't obvious from the brief reading of the manual. 4. A hardware bug was fixed - RF diversity switch required a bias to work correctly. Luckily we decided to move the switch from the main board to a frontend in the rev2 of UmTRX. So we don't have to re-make the UmTRX schematics. Huge thanks to Andrey Sviyazov ("RF guy"), Andrew Karpenkov ("FPGA guy") and Srdjan Milenkovic ("remote LimeMicro guy") for going through all the issues. Fixes for the code will be pushed to github in the next few days after I clean it up. PS Another good news is that we should have first UmTRXv2 units on hands in the next few days, when we get them from customs. Can't wait to put my hands on them. -- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru