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Alexander Chemeris alexander.chemeris at gmail.comJFYI: Attached is a GMSK samples file I use for testing (1.083333MSPS, 4 smp/symb) and the spectrum I get with UmTRX. On Sat, Apr 21, 2012 at 12:00, Alexander Chemeris <alexander.chemeris at gmail.com> wrote: > Hi all, > > Attached is an UHD-based FPGA image for UmTRX. We've just fixed one > last bug in the Tx chain and I think it's a good time to let everyone > know about the progress. Corresponding host software could be built > from the 'fairwaves/umtrx-dboard' branch in our repo: > https://github.com/chemeris/UHD-Fairwaves/tree/fairwaves/umtrx-dboard > > Notes: > > 1. UHD code doesn't touch LMS configuration at all. So all LMS > configuration should be done before you run UHD tools with the help of > 'umtrx_lms.py' utility. This includes turning on LMS Rx/TX modules, > tuning, calibration, amplifiers configuration, etc: > https://github.com/chemeris/UHD-Fairwaves/blob/fairwaves/umtrx-dboard/host/utils/umtrx_lms.py > > 2. So far only Tx has been tested and is known to work fine. Rx > testing is our next target. > > 3. LMS works at 13 MSPS and UHD allows you to go up to this rate. > Interpolation in Tx chain is known to work well, so you could also use > fractions of that rate, like 0.270833 MSPS ;) > > 4. It's strongly recommended to tune VGA1 DC offset in a LMS before > using - it reduces LO leakage by very nice 25 dB. > > 5. We still have to figure out how to tune I/Q balance in UHD. > Without calibration LMS doesn't perform very well. I know it should be > pretty straightforward to do, but we have to figure out how. > > -- > Regards, > Alexander Chemeris. > CEO, Fairwaves LLC / ООО УмРадио > http://fairwaves.ru -- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru -------------- next part -------------- A non-text attachment was scrubbed... Name: gmsk.cfile Type: application/octet-stream Size: 131072 bytes Desc: not available URL: <http://lists.osmocom.org/pipermail/umtrx/attachments/20120423/85e2722e/attachment.obj> -------------- next part -------------- A non-text attachment was scrubbed... Name: gmsk.PNG Type: image/png Size: 135432 bytes Desc: not available URL: <http://lists.osmocom.org/pipermail/umtrx/attachments/20120423/85e2722e/attachment.png>