18 Mar
2013
18 Mar
'13
4:30 p.m.
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(a)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(a)gmail.com>
wrote:
--
Regards,
Alexander Chemeris.
CEO, Fairwaves LLC / ООО УмРадио
http://fairwaves.ru
Joel,
On Wed, Mar 13, 2013 at 9:09 PM, joel yabut <joel(a)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