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joel yabut joel at jointventure.comOK. 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. > -- Mother Ignacia Avenue corner Scout Rallos St. Quezon City, Metro Manila, Philippines -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/umtrx/attachments/20130310/829acdeb/attachment.htm>