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jiangwy wyjiang at ljshuoda.comI try another UmTRX board, and it's OK. The difference from the channel 0 and 1 is very small. jiangwy From: Alexander Chemeris Date: 2013-08-02 17:30 To: wyjiang CC: UmTRX 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/umtrx/attachments/20130802/e3154d33/attachment.htm>