UmTRX performance questions

joel yabut joel at jointventure.com
Sun Mar 10 18:00:32 UTC 2013


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&colspec=ID%20Type%20Status%20Priority%20Milestone%20Owner%20Summary%20Modified>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

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 at gmail.com>wrote:

> Hi Joel.
>
> On Fri, Feb 22, 2013 at 6:28 PM, joel yabut <joel at 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<https://code.google.com/p/umtrx/issues/detail?id=41&can=1&colspec=ID%20Type%20Status%20Priority%20Milestone%20Owner%20Summary%20Modified>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.
>



-- 
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Quezon City, Metro Manila, Philippines
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