UmTRX October 2012

umtrx@lists.osmocom.org

23 participants
25 discussions

FPGA project for UmTRX v2 board
by Andrew Karpenkov 14 Oct '12

14 Oct '12

Hi All, I ported UmTRX project to the new UmTRX v2 board. Now you can compile FPGA project for UmTRX v2 board with "make UmTRXv2" command from fairwaves/umtrx branch. Now, my next goal is to get a working second transmission channel in fpga project. Regards, Andrew Karpenkov

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The need of duplexer in low power operation
by Alexander Chemeris 11 Oct '12

11 Oct '12

Andrey Sviyazov, this question is probably for you, IIRC, both nanoBTS and SysmoBTS have separate antennas for Rx andTx and do not use duplexers. Do we need duplexer for UmTRXv2 if it operates in the low power mode, without an additional PA/LNA? -- Regards, Alexander Chemeris CEO, Fairwaves LLC http://fairwaves.ru

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LPF Bandwidth Tuning with LMS6002
by Gillian Seed 09 Oct '12

09 Oct '12

Hi, I'm having a problem while trying to do a LPF Bandwidth tuning as described in a Programming and Calibration guide page 40, figure 4.5 and on https://github.com/chemeris/UHD-Fairwaves/blob/fairwaves/umtrx/host/utils/u…. Currently it seems to always fail when it's trying to find the VCOCAP value. I'm only getting Low printed before it fails. I was wondering why it takes a 320MHz frequency, because it's not described anywhere in the documents, could I try to do a bandwidth tuning with some other frequency as well? I'm running my code in a following order (http://lists.osmocom.org/pipermail/umtrx/2012-July/000075.html), Example setup for ARFCN 925: Initialization and auto-calibration: ./umtrx_lms.py --lms 1 --lms-init ./umtrx_lms.py --lms 1 --lms-tx-enable 1 ./umtrx_lms.py --lms 1 --lms-rx-enable 1 ./umtrx_lms.py --lms 1 --pll-ref-clock 26e6 --lpf-bandwidth-code 0x0f --lms-auto-calibration RX LNA and RXVGA2 selection and gain control ./umtrx_lms.py --lms 1 --reg 0x75 --data 0xf0 ./umtrx_lms.py --lms 1 --reg 0x65 --data 10 TX LPF control ./umtrx_lms.py --lms 1 --reg 0x34 --data 0x3e LO leakage cancellation (calibration data values may vary) ./umtrx_lms.py --lms 1 --reg 0x42 --data 0x67 ./umtrx_lms.py --lms 1 --reg 0x43 --data 0x89 TX/RX PLL charge pump current ./umtrx_lms.py --lms 1 --reg 0x16 --data 0x93 Tuning ./umtrx_lms.py --lms 1 --lms-rx-pll-tune 925.2e6 ./umtrx_lms.py --lms 1 --lms-tx-pll-tune 880.2e6 TXVGA2 gain to max and enable PA ./umtrx_lms.py --lms 1 --reg 0x45 --data 0xc8 ./umtrx_lms.py --lms 1 --lms-pa-on 2

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ET1011C2 1GbE PHY availability
by Alexander Chemeris 07 Oct '12

07 Oct '12

Andrey, Jean-Samuel, I wanted to check pricing for ET1011C2-CI-DT - 1GbE PHY chip we use and I haven't found it neither in DigiKey, nor at Mouser. At Arrow they are "Call for Quote": http://components.arrow.com/part/search/ET1011C2 Do you know what happened to this chip? Is there any pin-to-pin replacements or could we buy enough of those chips from some other source? -- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru

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UmTRXv2-- it's alive!
by Robin Coxe 05 Oct '12

05 Oct '12

Alexander is visiting Boston after the Open Hardware Summit last week in NYC. We powered up the umTRXv2 for the first time yesterday afternoon and immediately captured a GSM signal on the Signal Hound after launching OpenBTS. Echo Test with the test handset worked like a charm. Congratulations to the Fairwaves team! -Robin -- Robin Coxe | Close-Haul Communications, Inc. | Boston, MA +1-617-470-8825

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UmTRX October 2012