5 Mar
2013
5 Mar
'13
9:07 a.m.
On Fri, Feb 22, 2013 at 6:28 PM, joel yabut <joel(a)jointventure.com> wrote:
May i know the following specs
1. What is the tx and rx isolation of umtrx?
2. What is the power output in dbm of your umtrx?
Andrey Sviyazov will comment on this.
3. How is the lna on the rx input and is an external
lna and bpf
recommended?
For Fairwaves 10W base stations we're developing UmSEL, which has
channel filter and an additional LNA. For the use without amplifier
you don't need any additional filters or LNAs.
4. What is the main advantage of umtrx compared to
usrp by ettus?
If you want to use it for GSM, then it's cheaper and gives you
dual-channel support.
--
Regards,
Alexander Chemeris.
CEO, Fairwaves LLC / ООО УмРадио
http://fairwaves.ru
5 Mar
5 Mar
1:16 p.m.
New subject: UmTRX performance questions
Hi Joel.
On Fri, Feb 22, 2013 at 6:28 PM, joel yabut <joel(a)jointventure.com> wrote:
Not yet measured and
unfortunately there are no info from Lime Micro.
Andrey Sviyazov.
May i know the
following specs
1. What is the tx and rx isolation of umtrx?
2. What is the power output in dbm of your umtrx?
After fixing this
issue<https://code.google.com/p/umtrx/issues/detail?id=41&can=1&…
measured + 20 dBm for 900 MHz band and +17 dBm for 1800.
3. How is the lna on the rx input and is an
external lna and bpf
recommended?
For Fairwaves 10W base stations we're developing UmSEL, which has
channel filter and an additional LNA. For the use without amplifier
you don't need any additional filters or LNAs.
4. What is the main advantage of umtrx compared
to usrp by ettus?
If you want to use it for GSM, then it's cheaper and gives you
dual-channel support.
--
Regards,
Alexander Chemeris.
CEO, Fairwaves LLC / ООО УмРадио
http://fairwaves.ru
Best regards, 
10 Mar
10 Mar
2 p.m.
New subject: UmTRX performance questions
OK. Thank you.
2. What is the power output in dbm of your umtrx?
After fixing this
issue<https://code.google.com/p/umtrx/issues/detail?id=41&can=1&…
measured + 20 dBm for 900 MHz band and +17 dBm for 1800.
I will be testing this UMTRX with a DCS amp with 10 dBM input. Just to be
sure, I just need to adjust attenuation to at least 7 dBM and 8 probably to
avoid clipping the RF amp as below:
GSM.Radio.PowerManager.MaxAttenDB 8
GSM.Radio.PowerManager.MinAttenDB 0
Is using an LNA with BPF advisable with your UMTRX?
What is the operating temperature of your UMTRX as I want to make sure the
HD case I am using for testing is good enough. I installed a small fan and
so far temperature is around 40 deg C.
The LEDs are on the board and I may want to solder some LEDs to monitor
status, where on the board can I terminate the power for LEDs?
On Tue, Mar 5, 2013 at 10:16 AM, Andrey Sviyazov <andreysviyaz(a)gmail.com>wrote;wrote:
Hi Joel.
On Fri, Feb 22, 2013 at 6:28 PM, joel yabut <joel(a)jointventure.com> wrote:
Not yet measured and
unfortunately there are no info from Lime Micro.
Andrey Sviyazov.
--
Mother Ignacia Avenue corner Scout Rallos St.
Quezon City, Metro Manila, Philippines
May i
know the following specs
1. What is the tx and rx isolation of umtrx?
2. What is the power output in dbm of your
umtrx?
After fixing this
issue<https://code.google.com/p/umtrx/issues/detail?id=41&can=1&…
measured + 20 dBm for 900 MHz band and +17 dBm for 1800.
3. How is the lna on the rx input and is an
external lna and bpf
recommended?
For Fairwaves 10W base stations we're developing UmSEL, which has
channel filter and an additional LNA. For the use without amplifier
you don't need any additional filters or LNAs.
4. What is the main advantage of umtrx compared
to usrp by ettus?
If you want to use it for GSM, then it's cheaper and gives you
dual-channel support.
--
Regards,
Alexander Chemeris.
CEO, Fairwaves LLC / ООО УмРадио
http://fairwaves.ru
Best regards,
3:20 p.m.
New subject: UmTRX performance questions
Hi Joel.
2. What is the power output in dbm of your umtrx?
After fixing this
issue<https://code.google.com/p/umtrx/issues/detail?id=41&can=1&…
measured + 20 dBm for 900 MHz band and +17 dBm for 1800.
I will be testing this UMTRX with a DCS amp with 10 dBM input. Just to be
sure, I just need to adjust attenuation to at least 7 dBM and 8 probably to
avoid clipping the RF amp as below:
GSM.Radio.PowerManager.MaxAttenDB 8
GSM.Radio.PowerManager.MinAttenDB 0
Please explain more what att do you try to use and what clipping do you
mean (may be 1dB gain compression) ?
Anyhow, you can easy adjust output signal of UmTRX by using --gain in case
of UHD TX control.
Also can be used TXVGA2 gain in case of direct LMS registers control via
Python scripts.
Is using an LNA with BPF advisable with your UMTRX?
Yes of course.
External LNA and duplexer or band pass filter should be used for better NF
performance.
What is the operating temperature of your UMTRX as I want to make sure the
HD case I am using for testing is good enough. I installed a small fan and
so far temperature is around 40 deg C.
You can find on the board FUN2 control IC (U35)
MAX6665ASA45<http://datasheets.maximintegrated.com/en/ds/MAX6665.pdf>
.
So, at the PCB temperature +45'C FUN2 must start to cooling.
And if you do not use FAN2 (or broken) then this IC will switch off UmTRX
at temperature 45+30=75'C.
Low temperature limit is minus 40'C due to industrial components (is not
tested 100% in production).
The LEDs are on the board and I may want to solder
some LEDs to monitor
status, where on the board can I terminate the power for LEDs?
You can use any DC-DC output higher 2V through current limiting resistor.
Pleas refer to datasheet of your LED's type to find proper resistor value.
On Tue, Mar 5, 2013 at 10:16 AM, Andrey Sviyazov <andreysviyaz(a)gmail.com>wrote;wrote:
Best regards,
Andrey Sviyazov.
Hi Joel.
On Fri, Feb 22, 2013 at 6:28 PM, joel yabut <joel(a)jointventure.com>
wrote:
Not yet measured and
unfortunately there are no info from Lime Micro.
Andrey Sviyazov.
--
Mother Ignacia Avenue corner Scout Rallos St.
Quezon City, Metro Manila, Philippines
May i
know the following specs
1. What is the tx and rx isolation of umtrx?
2. What is the power output in dbm of your
umtrx?
After fixing this
issue<https://code.google.com/p/umtrx/issues/detail?id=41&can=1&…
measured + 20 dBm for 900 MHz band and +17 dBm for 1800.
3. How is the lna on the rx input and is an
external lna and bpf
recommended?
For Fairwaves 10W base stations we're developing UmSEL, which has
channel filter and an additional LNA. For the use without amplifier
you don't need any additional filters or LNAs.
4. What is the main advantage of umtrx compared
to usrp by ettus?
If you want to use it for GSM, then it's cheaper and gives you
dual-channel support.
--
Regards,
Alexander Chemeris.
CEO, Fairwaves LLC / ООО УмРадио
http://fairwaves.ru
Best regards, 
10:28 p.m.
New subject: UmTRX performance questions
Yes i need to attenuate the tx output and Also take into consideration the 1 db
compression. I just have to
min attenuation to 8.
Sent from my Ipad
On Mar 11, 2013, at 3:20 AM, Andrey Sviyazov <andreysviyaz(a)gmail.com> wrote:
Hi Joel.
2. What is the power output in dbm of your umtrx?
After fixing this issue I measured + 20 dBm for 900 MHz band and +17 dBm for 1800.
I will be testing this UMTRX with a DCS amp with 10 dBM input. Just to be sure, I just
need to adjust attenuation to at least 7 dBM and 8 probably to avoid clipping the RF amp
as below:
GSM.Radio.PowerManager.MaxAttenDB 8
GSM.Radio.PowerManager.MinAttenDB 0
Please explain more what att do you try to use and what clipping do you mean (may be 1dB
gain compression) ?
Anyhow, you can easy adjust output signal of UmTRX by using --gain in case of UHD TX
control.
Also can be used TXVGA2 gain in case of direct LMS registers control via Python scripts.
Is using an LNA with BPF advisable with your UMTRX?
Yes of course.
External LNA and duplexer or band pass filter should be used for better NF performance.
What is the operating temperature of your UMTRX as I want to make sure the HD case I am
using for testing is good enough. I installed a small fan and so far temperature is around
40 deg C.
You can find on the board FUN2 control IC (U35) MAX6665ASA45.
So, at the PCB temperature +45'C FUN2 must start to cooling.
And if you do not use FAN2 (or broken) then this IC will switch off UmTRX at temperature
45+30=75'C.
Low temperature limit is minus 40'C due to industrial components (is not tested 100%
in production).
The LEDs are on the board and I may want to solder some LEDs to monitor status, where on
the board can I terminate the power for LEDs?
You can use any DC-DC output higher 2V through current limiting resistor.
Pleas refer to datasheet of your LED's type to find proper resistor value.
On Tue, Mar 5, 2013 at 10:16 AM, Andrey Sviyazov <andreysviyaz(a)gmail.com> wrote:
Hi Joel.
On Fri, Feb 22, 2013 at 6:28 PM, joel yabut <joel(a)jointventure.com> wrote:
May i know the following specs
1. What is the tx and rx isolation of umtrx?
Not yet measured and unfortunately
there are no info from Lime Micro.
2. What is the power output in dbm of your umtrx?
After fixing this issue I measured + 20 dBm for 900 MHz band and +17 dBm for 1800.
3. How is the lna on the rx input and is an
external lna and bpf
recommended?
For Fairwaves 10W base stations we're developing UmSEL, which has
channel filter and an additional LNA. For the use without amplifier
you don't need any additional filters or LNAs.
4. What is the main advantage of umtrx compared
to usrp by ettus?
If you want to use it for GSM, then it's cheaper and gives you
dual-channel support.
--
Regards,
Alexander Chemeris.
CEO, Fairwaves LLC / ООО УмРадио
http://fairwaves.ru
Best regards,
Andrey Sviyazov.
--
Mother Ignacia Avenue corner Scout Rallos St.
Quezon City, Metro Manila, Philippines
Best regards,
Andrey Sviyazov.
4:16 p.m.
New subject: UmTRX performance questions
Joel,
In addition to comments from Andrey:
On Sun, Mar 10, 2013 at 10:00 PM, joel yabut <joel(a)jointventure.com> wrote:
I will be testing this UMTRX with a DCS amp with 10
dBM input. Just to be
sure, I just need to adjust attenuation to at least 7 dBM and 8 probably to
avoid clipping the RF amp as below:
GSM.Radio.PowerManager.MaxAttenDB 8
GSM.Radio.PowerManager.MinAttenDB 0
Yes, you could use these config values to control power output. Note,
that maximum output power is control by MinAttenDB and not MaxAttenDB,
because these are attenuation values.
Is using an LNA with BPF advisable with your UMTRX?
It depends on you intended usage. For high power BTS you need them,
yes. At this moment we're designing a proper RF solution for UmTRX as
a part of our UmSITE hardware.
What is the operating temperature of your UMTRX as I
want to make sure the
HD case I am using for testing is good enough. I installed a small fan and
so far temperature is around 40 deg C.
It is designed to meet industrial temperature range, but only units
used for UmSITE will be tested during manufacturing. UmTRX's which are
sold as DIY kit are not tested and could be assumed to meet indoor
temperature range.
The LEDs are on the board and I may want to solder
some LEDs to monitor
status, where on the board can I terminate the power for LEDs?
You could use "Ext connector" or LED1/LED2/LED3 connectors. Please
check schematics for details.
--
Regards,
Alexander Chemeris.
CEO, Fairwaves LLC / ООО УмРадио
http://fairwaves.ru
13 Mar
13 Mar
1:09 p.m.
New subject: UmTRX performance questions
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?
Thanks,
Joel
On Tue, Mar 5, 2013 at 10:07 PM, Alexander Chemeris <
alexander.chemeris(a)gmail.com> wrote:
On Fri, Feb 22, 2013 at 6:28 PM, joel yabut
<joel(a)jointventure.com> wrote:
--
Mother Ignacia Avenue corner Scout Rallos St.
Quezon City, Metro Manila, Philippines
May i know the following specs
1. What is the tx and rx isolation of umtrx?
2. What is the power output in dbm of your umtrx?
Andrey Sviyazov will comment on this.
3. How is the lna on the rx input and is an
external lna and bpf
recommended?
For Fairwaves 10W base stations we're developing UmSEL, which has
channel filter and an additional LNA. For the use without amplifier
you don't need any additional filters or LNAs.
4. What is the main advantage of umtrx compared
to usrp by ettus?
If you want to use it for GSM, then it's cheaper and gives you
dual-channel support.
--
Regards,
Alexander Chemeris.
CEO, Fairwaves LLC / ООО УмРадио
http://fairwaves.ru
18 Mar
18 Mar
2:49 p.m.
New subject: UmTRX performance questions
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_specif…
--
Regards,
Alexander Chemeris.
CEO, Fairwaves LLC / ООО УмРадио
http://fairwaves.ru
2:52 p.m.
New subject: UmTRX performance questions
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:
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
4:30 p.m.
New subject: UmTRX performance questions
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
4513
days inactive
4526
days old
9 comments
5 participants
participants (5)
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Alexander Chemeris -
Andrey Sviyazov -
Joel Que Yabut -
joel yabut
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Joel Yabut