UmTRX performance questions

Alexander Chemeris alexander.chemeris at gmail.com
Mon Mar 18 20:30:02 UTC 2013


Joel,

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




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