> 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