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Alexander Chemeris alexander.chemeris at gmail.comOn Wed, Jun 20, 2012 at 8:11 AM, Alexander Chemeris <alexander.chemeris at gmail.com> wrote: > On Wed, Jun 20, 2012 at 5:33 AM, Thomas Tsou <thomastsou at gmail.com> wrote: >> On Mon, Jun 18, 2012 at 1:31 AM, Alexander Chemeris >> <alexander.chemeris at gmail.com> wrote: >>> Nothing really tested yet. At least you should do this steps: >>> ./umtrx_lms.py --lms 1 --lms-rx-enable 1 >>> ./umtrx_lms.py --lms 1 --lms-rx-pll-tune 925e6 >>> ./umtrx_lms.py --lms 1 --pll-ref-clock 26e6 --lpf-bandwidth-code 0x0f >>> --lms-auto-calibration >>> >>> Then you need to select Rx input with register 0x75. Should be >>> something like this: >>> ./umtrx_lms.py --lms 1 --reg 0x75 --data 0xF0 >>> >>> There are a lot of other settings for Rx fontend in LMS which I don't >>> understand, but I guess defaults should be fine for the start. Then we >>> could tune them with Andrey's help. >>> >>> If signal is too low you may need to tune Rx VGA2 gain with the >>> register 0x65 (refer to the programming guide for the register values >>> encoding). >> >> Connected a call - all seven actually. It's quite stable once setup. > > Good job! > > How did you setup Rx on LMS? > And anything else to know before testing? > >> 'fairwaves/umtrx' branch with u2plus_umtrx-20120424.bit and following >> patch. > > Now it's time to make this a configure option. :) > >> I and Q were swapped. > > So I/Q order is different at Rx and Tx?We could fix this in FPGA. > > With the multi-ARFCN support, do you think it will be hard to add > support for the second channel in UmTRX to OpenBTS to get 15 calls? > Second channel is not fully supported by UmTRX FPGA firmware yet, but > we should do this soon. Actually interesting would be to test UmTRX with your multi-ARFCN code to see how many channels we could fit into. I wonder how do you select/measure rx_smpl_offset. My guess is that you write both Tx and Rx I/Q streams to files, plot them and try to align frame starts. Is that how do you do this? PS Could you record a short video of making 7 calls through UmTRX? We should make some noise or people forget what we're doing. -- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru