UmTRX June 2013

umtrx@lists.osmocom.org

7 participants
4 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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UmTRX June 2013