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Alexander Chemeris alexander.chemeris at gmail.comАндрей, напиши ему свой адрес? Меня в копию поставь. On Sat, Aug 3, 2013 at 6:48 AM, jiangwy <wyjiang at ljshuoda.com> wrote: > ** > Hi Andrey Sviyazov. > > I have tried the kal program on both boards, the output are: > > The following commands are executed on the normal board > ./kal -s GSM900 -v -R A:0 > kal: Scanning for GSM-900 base stations. > > channel detect threshold: 19506.878626 > > chan: 11 (937.2MHz - 13.389kHz) power: 53673.23 > > chan: 14 (937.8MHz + 4Hz) power: 64031.10 > > chan: 16 (938.2MHz + 30Hz) power: 37823.70 > > chan: 43 (943.6MHz + 2Hz) power: 77249.29 > > chan: 50 (945.0MHz - 24Hz) power: 29420.52 > > ./kal -s GSM900 -v -R B:0 > kal: Scanning for GSM-900 base stations. > > channel detect threshold: 28406.616263 > > chan: 11 (937.2MHz - 6.120kHz) power: 53776.77 > > chan: 14 (937.8MHz - 59Hz) power: 76683.83 > > chan: 16 (938.2MHz + 28.945kHz) power: 46724.84 > > chan: 43 (943.6MHz + 38.130kHz) power: 65350.20 > chan: 50 (945.0MHz - 21Hz) power: 29930.09 > > The following commands are executed on another board seeming to be abnormal > ./kal -s GSM900 -v -R A:0 > kal: Scanning for GSM-900 base stations. > > channel detect threshold: 4486.504362 > > chan: 5 (936.0MHz - 15Hz) power: 6734.70 > > chan: 12 (937.4MHz + 50Hz) power: 9339.20 > chan: 83 (951.6MHz - 13Hz) power: 6462.91 > > ./kal -s GSM900 -v -R B:0 > kal: Scanning for GSM-900 base stations. > > channel detect threshold: 27671.315417 > > chan: 5 (936.0MHz + 24Hz) power: 29673.93 > > chan: 12 (937.4MHz + 40Hz) power: 69096.60 > > chan: 83 (951.6MHz - 4Hz) power: 46394.73 > > ./kal -c 1004 -R A:0 > kal: Calculating clock frequency offset. > Using E-GSM-900 channel 1004 (931.0MHz) > average [min, max] (range, stddev) > + 2Hz [-80, 79] (159, 44.543312) > overruns: 0 > not found: 34 > > ./kal -c 1004 -R B:0 > kal: Calculating clock frequency offset. > Using E-GSM-900 channel 1004 (931.0MHz) > average [min, max] (range, stddev) > + 1Hz [-13, 19] (32, 8.658517) > overruns: 0 > not found: 0 > > Best Regards. > > ------------------------------ > jiangwy > > *From:* Andrey Sviyazov <andreysviyaz at gmail.com> > *Date:* 2013-08-03 00:54 > *To:* wyjiang <wyjiang at ljshuoda.com> > *CC:* UmTRX <umtrx at lists.osmocom.org>; Alexander Chemeris<alexander.chemeris at gmail.com> > *Subject:* Re: Re: The Difference of Signal Strength From Two Channels on > The Same Board is Big > Hi Jiang Wenyi. > > Please double check that both UmTRX's runs with the same FPGA images > (and firmware). > If absolutely the same then seems one board is broken. > Please double check it also by some other tests to be sure before send to > us for repair. > > Best regards, > Andrey Sviyazov. > > > 2013/8/2 jiangwy <wyjiang at ljshuoda.com> > >> ** >> I try another UmTRX board, and it's OK. The difference from the channel 0 >> and 1 is very small. >> >> ------------------------------ >> jiangwy >> >> *From:* Alexander Chemeris <alexander.chemeris at gmail.com> >> *Date:* 2013-08-02 17:30 >> *To:* wyjiang <wyjiang at ljshuoda.com> >> *CC:* UmTRX <umtrx at lists.osmocom.org> >> *Subject:* Re: Re: The Difference of Signal Strength From Two Channels >> on The Same Board is Big >> Ok. >> >> Also check that a correct input is selected on both chips >> (--lms-get-rx-lna option). >> >> >> Then, could you check whether this is consistent among both UmTRX you have? >> >> On Fri, Aug 2, 2013 at 12:55 PM, jiangwy <wyjiang at ljshuoda.com> wrote: >> > I use the following command >> > >> > ./umtrx_lms.py --lms {1,2} --lms-get-rx-vga2-gain >> > >> > the outputs are all the same ( 15 ). >> > >> > ________________________________ >> > jiangwy >> > >> > From: Alexander Chemeris >> > Date: 2013-08-02 16:20 >> > To: wyjiang >> > CC: UmTRX >> >> > Subject: Re: The Difference of Signal Strength From Two Channels on The Same >> > Board is Big >> > Hi Jiang, >> > >> > Are you sure you're setting Rx gain properly for both channels? >> > I recommend you to use umtrx_lms.py script from this repository to >> > check Rx LNA and Rx VGA settings for both LMS chips: >> > https://github.com/fairwaves/umtrx_scripts >> > >> > On Fri, Aug 2, 2013 at 12:09 PM, jiangwy <wyjiang at ljshuoda.com> wrote: >> >> Hi Alexander Chemeris, >> >> >> >> >> According to rx_multi_samples , I write a program to receive samples from >> >> two channels on the same board. >> >> The program receive samples from 2 channels and calculate the signal >> >> strength respectively. The signal is from a BTS arround. >> >> I find the difference of signal strength is very big, about 20dB, and >> >> channel 1 is bigger than channel 0. >> >> I exchange the antenna and feeder of the them, but the result is same. >> >> I think there is some problem, but I cann't find it. >> >> Would you please give me some sugguestion? >> >> >> >> Best Regards. >> >> >> >> ________________________________ >> >> Jiang Wenyi >> > >> > >> > >> > -- >> > Regards, >> > Alexander Chemeris. >> > CEO, Fairwaves LLC / ООО УмРадио >> > http://fairwaves.ru >> > >> >> >> >> -- >> Regards, >> Alexander Chemeris. >> CEO, Fairwaves LLC / ООО УмРадио >> http://fairwaves.ru >> >> > > -- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/umtrx/attachments/20130805/fa5d325e/attachment.htm>