UmTRX

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189 discussions

UmTRX firmware update
by Alexander Chemeris 25 Jun '13

25 Jun '13

Hi all, If you use the latest UHD sources, you should update your ZPU firmware to the latest version: http://people.osmocom.org/ipse/umtrx-v2/fpga_bitsream/2013-06-25-2f3817a9/ You could update your FPGA image as well, but ZPU part is critical for the smooth operation with the latest host side code. If you don't update ZPU, all UHD utilities will exist on startup. The reason is that the new host code sends a command to ZPU which older ZPUs does not understand, so the host side code raises exception and exits. A new feature which is the reason for the breakage is that now you could not only set, but also read back the current value of the TCXO calibration DAC. If you run this utility without any parameters, it will autodetect UmTRX and read the DAC value from it. https://github.com/fairwaves/umtrx_scripts/blob/master/python_lib/umtrx_vcx… This is praticularly useful when you calibrate using GPS and want to store this value to EEPROM to use it when GPS is not available. -- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru

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UMTX IRC channel.
by choukoumoun 18 Jun '13

18 Jun '13

Hello List, apparently there is no IRC channel UMTRX ... an IRC channel was temporarily created to discuss the live UMTRX. # umtrx on geeknode. Bye

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UmTRX
by Albert-Miquel Sánchez 17 Jun '13

17 Jun '13

Hello, Im an engineer from Spain and Im interested in a GSM receiver because I would like to study the internal signals for a research project. In particular, Im interested in the analysis of the IF signal, but, as Alexander told me, the LMS6002D uses zero-IF architecture, so there is no real "IF" signal, there is only baseband signal. I guess I could also use this signal for my purposes, but only if all 124 GSM channels can be found at that point. Im not sure if this is possible, since there is a low-pass filter before. Does anybody know if I can extract that information, that is, the analogic 124 channels after the RF mixer? If it is not possible with this board, does anybody know if I can do it with another GSM transceiver board? Thank you very much in advance. Best regards, Albert

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Time to Switching Frequence
by jiangwy 07 Jun '13

07 Jun '13

Hi All, I have a project to monitoring ( air sniffer ) the data between GSM BTS and MS using UmTRX. Uplink Transmission is delayed 3 slots than downlink from specification. So when I sync. with BTS and get the downlink slot data, I must switch the freqs of receiver from downlink to uplink in less than 2 slots. When the program call 'usrp_dev->set_rx_freq(wFreq)', How much time does the UmTRX switch to the 'wFreq' ? Thanks in advance. Jiang WenYi

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Re: GSM clock GPS txco help
by Alexander Chemeris 22 May '13

22 May '13

Hi Will, Thank you for the good news. Answering to your question, first please update your UmTRX firmware and host side UHD: 1. Update your UHD and umtrx_scripts from the git. Build UHD. 2. Flash attached ZPU firmware to a UmTRX with the following command: ./usrp_n2xx_net_burner.py --addr=192.168.10.2 --fw=usrp2p_txrx_uhd.bin 3. Power cycle UmTRX Calibrate with GPS: 1. Take your UmTRX outside to get GPS lock. 2. When GPS acquires a lock, use 'umtrx_vcxo.py' utility without parameters to read current VCTCXO DAC value in a loop. 3. When the value stabilise (couple minutes after GPS acquires the lock), write this value to EEPROM: ./usrp_burn_mb_eeprom --key tcxo-dac --val <YOUR_VAL> 4. Now i should pickup the value from EEPROM on boot, so GPS is no required unless you change ambient temperature considerably. Note, that you should warm up your UmTRX for a while before calibration, because it depends on the TCXO temperature. Let me know if something goes wrong - I wasn't able to test everything, as I don't have my UmTRX with me at the moment. On Tue, May 21, 2013 at 9:50 PM, Will Hawkins <hawkinsw(a)opentechinstitute.org> wrote: > Hey Alexander! > > Yesterday we took our umtrx outside to get the GPS lock for calibrating the > tcxo voltage. There were some good outcomes and bad outcomes: > > The good: > If you remember correctly, Dan could not associate to the umtrx with his > Galaxy Nexus. After getting a GPS signal, Dan's phone could associate! So, > great news. > > The bad: > We attempted to record the calibrated tcxo dac values and had no luck. We > booted the umtrx board connected via serial console to my laptop. I was able > to see the boot messages and other output so I know the console was working. > Once the board got a GPS lock, I assumed that I would see some tcxo DAC > values printed to the console. Based on what you said last week, I was going > to wait until those values stabilized and then use that output to flash into > the eeprom. Unfortunately I did not see any output on the serial console. > Then I thought that we could poll the umtrx (using UHD probe) for its tcxo > dac values. Unfortunately it showed the default (2048) every time. > > Can you tell me what I'm doing wrong? > > Thanks! > Will > > PS: CC'ing Dan since he's working this with me. -- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru

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UMTRX - SRAM
by Yaniv Shiber 21 May '13

21 May '13

Hi All, I wish to work with the Synchronize Sram and to connect it to the FPGA Microblaze. Does anyone was able to use and communicate with the SRAM? If so, can U help with the configuration of the EMC? I read the EMC datasheet and they describe different way for connecting the EMC with the SRAM. Maybe U know on a problem when working with SRAM? thanks in advance, Yaniv

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SRAM Prpblem
by Yaniv Shiber 11 May '13

11 May '13

Hi to All I am trying to implement Xilinx microblaze on the umtrx2 with EMC core that connect to the external SRAM. I configured the EMC to Synchronous mode and I used the UCF that is published at the GITHUB. If I am trying to deluge the MCU without the EMC the MCU seem running, but when I connect the EMC, the MCU stuck and I cannot download the code through the JTAG. Please advise how to connect the EMC core to the external SRAM ? thanks in advance, Yaniv

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Umtrx meeting in Paris :)
by stephane＠shimaore.net 08 May '13

08 May '13

Hello team, I met in Paris with Jean-Samuel last Friday. We talked among other things about handover in OpenBTS and I wanted to share some of our ideas with you. Note: this is my recollection of things, if I misreported something it's my fault. :} # Handling SIP intricacies outside of OpenBTS We both agreed that it is better/simpler to keep the complexity of SIP protocol out of OpenBTS. There are already very good platforms that can hide the intricacies of SIP from OpenBTS (FreeSwitch, Asterisk, OpenSIPS B2BUA, etc.). The alternative (implementing a complete, compliant B2BUA SIP stack inside OpenBTS) seems difficult (complete rewrite using e.g. sofia-sip) and doesn't help with time-to-market. We also both enjoy the "GSM handset looks like a SIP endpoint" analogy that is the basis of OpenBTS and would like to keep the OpenBTS GSM-to-SIP interface as transparent as possible.

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[EVENT ANNOUNCEMENT] Boston Open GSM Meetup on Friday 10 May 2013
by Robin Coxe 06 May '13

06 May '13

(Apologies for cross-posting. We wanted to reach everyone who might be interested in attending. Please respond responsibly.) Anders Brownworth (Switchcoder), Alexander Chemeris (Fairwaves), and Robin Coxe (Close-Haul Communications & Analog Devices) invite those interested in open GSM hardware and software development to an informal gathering in Cambridge, MA on Friday 10 May 2013 from 6-8 pm. Alexander will be visiting the Boston area from Moscow. If you are interested in participating in any capacity in the Boston-area open source GSM development community, we look forward to meeting you. Our goal is to identify like-minded people involved in or interested in learning more about projects such as OpenBTS, OsmocomBTS, OsmocomBB, and OpenBSC. If you have a portable, self-contained demo, feel free to bring it with you. When: Friday 10 May 2013, 6-8 pm EDT Where: Cambridge Innovation Center, 1 Broadway, 4th Floor, Cambridge, MA 02142 USA Photo ID required for building entry. Please RSVP on Eventbrite: http://opengsmboston.eventbrite.com/

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Multiple DDC chains on UMTRX
by John Wilson 22 Apr '13

22 Apr '13

Hello, I was wondering whether there is an FPGA image for the UmTRX which gives 4x DDC Rx chains (at the expense of the two DUC chains) like the USRP1 usrp1_fpga_4rx.rbf. I guess this is unlikely, due to the fact it looks like the majority of people are using the UmTRX for OpenBTS! How difficult would it be to change the current firmware to support this. Another couple of questions, what's the maximum achievable bandwidth through a single Rx chain so far and are there any constraints on what value of decimation to use (e.g. USRP has the requirement that to use both CIC filters decimation factors have to be a factor of 4, otherwise the frequency response will be affected)? When I increase the sample rate (e.g. 4.333 MHz) I start seeing the frequency response affected, the FFT plot seems to 'flicker' between a reasonably flat looking response and a poor frequency response (see attached files - both taken from the same running instance of a flow graph) Cheers, John -- *Dr. John Wilson* Product development engineer, Path Intelligence<http://www.pathintelligence.com/> T +44 2392 388442 @pathintel DETECT • ANALYSE • PREDICT • INFLUENCE Path Intelligence Limited, registered number 5176274. Registered in England, registered office at 1000 Lakeside North Harbour, Western Road, Portsmouth, UK, PO6 3EN

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