UmTRX October 2011

umtrx@lists.osmocom.org

3 participants
2 discussions

UmTRX prototype 1 final version
by Alexander Chemeris 27 Oct '11

27 Oct '11

Hi all, Just an update. We've finished PCB layout (ugh, finally!) and are sending them to a fab today or tomorrow. Attached are latest files and 3D images of the board. I hope we'll be holding a working prototype in our hands soon! Thank you all for your help! -- Regards, Alexander Chemeris.

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UmTRX aka OpenBTS HW update
by Alexander Chemeris 12 Oct '11

12 Oct '11

Hi Jean-Samuel, Harald, Holger, I've been quite for a while, so I want to make an update about the state of our hardware. On the FPGA development side we've been stuck for ~3 weeks, because somethings happened with the power controller on our Xilinx SP-605 board and we've been waiting for TI's USB-TO-GPIO to flash this controller. And now we're still dealing with this problem. On the hardware side things are much better. We have "Release Candidate" of schematics and working on PCB layout. We estimate that layout will be finished in a week if we don't decide to change something too much. In attachment you could find the latest versions of schematics in PDF and Altium Designer formats, 3D view (pre-alpha version), list of FPGA I/O and BOM. I would very much appreciate any comments, questions, concerns and ideas about schematics, controls placement, debug facilities, etc. It's much, much better to find bugs and satisfy all requests now, then when we get PCBs printed. Following the idea of Jean-Samuel we're trying to fit the PCB into 5.25" form-factor to be able to use various standard enclosures and even mount the board into a standard PC cases instead of a CD-ROM drive :) Right now estimated board size is 135х170mm, which perfectly fits into 5.25" case. Meantime I've created Google Code project to host our development: http://code.google.com/p/umtrx/ It's empty yet, I plan to gradually fill it with information. I'm happy to grant member rights for the project to any of you who is willing to contribute to descriptions, code (not there yet), etc. Just drop me an e-mail when you feel you need those rights. -- Regards, Alexander Chemeris.

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UmTRX October 2011