UmTRX performance questions

Alexander Chemeris alexander.chemeris at gmail.com
Mon Mar 18 18:49:55 UTC 2013


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_specific_hardware

--
Regards,
Alexander Chemeris.
CEO, Fairwaves LLC / ООО УмРадио
http://fairwaves.ru




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