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Alexander Chemeris alexander.chemeris at gmail.comJoel, What matters is not an absolute noise level, but signal SNR. On Mon, Mar 18, 2013 at 10:52 PM, Joel Que Yabut <Joel at jointventure.com> wrote: > Thanks I have done this already. > I have a spectrum analyzer as well but I am just want to check if I really > need to install the LNA as it seems that noise is going up. > > -- > Joint Venture SLEC, Inc. > > No. 2 Scout Rallos, Quezon City, Metro Manila > Philippines > Tel. 63 2 3742969 > Fax 63 2 3748662 > > > > > > On 3/19/13 2:49 AM, "Alexander Chemeris" <alexander.chemeris at gmail.com> > wrote: > >>Joel, >> >>On Wed, Mar 13, 2013 at 9:09 PM, joel yabut <joel at jointventure.com> wrote: >>> I have a question about the ideal RSSI Noise. I am testing the UMTRX and >>> have the following obeservation: >>> >>> when I type noise with the default setup of RX GAin 47. the RSSI noise >>>is >>> -26dB and when i change the noise to RX Gain 0. the RSSI noise goes >>>down to >>> -46dB. >>> >>> Which is the better option? as I understand the lower the noise floor >>>the >>> better. Now if I install my Duplexer, LNA and BPF my noise goise up to >>> -16dB. Is this okay or should I trim the RX gain? What is the ideal RSSI >>> NOISE? >> >>I can't give you an easy answer here. We're using a complicated >>procedure of tuning Rx gain to specific hardware configuration of our >>base stations. If you don't have measurement equipment, you could >>follow this manual to get to working results: >>https://code.google.com/p/umtrx/wiki/RunningOpenBTS#Tune_OpenBTS_for_speci >>fic_hardware >> >>-- >>Regards, >>Alexander Chemeris. >>CEO, Fairwaves LLC / ООО УмРадио >>http://fairwaves.ru >> > > -- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru