Re: UmTRX performance questions

-- 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@gmail.com wrote: >Joel, > >On Wed, Mar 13, 2013 at 9:09 PM, joel yabut joel@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 >