UmTRX performance questions

Joel Que Yabut Joel at jointventure.com
Mon Mar 18 18:52:54 UTC 2013


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
>






More information about the UmTRX mailing list