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Alexander Chemeris alexander.chemeris at gmail.comHi 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