UmTRX performance questions

Andrey Sviyazov andreysviyaz at gmail.com
Tue Mar 5 18:16:41 UTC 2013


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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