UmTRX October 2012

umtrx@lists.osmocom.org

23 participants
25 discussions

Re: Question regarding UmTRXv2 for early adopters should be ready in just few weeks

by SoftwareRadioGuy

> > Alexander, > > >> >> Does this mean people whom purchase the UmTRXv2 Samples will be able to >> >> obtain the Schematics/Gerber Files ? >> > >> > Yes. >> > Schematics are already published, btw: >> > https://github.com/chemeris/umtrx-schematics >> > > >> Just curious - what do you need gerbers for? Want to make some >> improvements? >> > > Prospectively, but if that wasn't in your plans, no problems. > > I support your efforts! > > > -- > Regards, > Alexander Chemeris. > CEO, Fairwaves LLC / ООО УмРадио > http://fairwaves.ru > > Sincerely, > > > SoftwareDefinesRadio > >> >

12 years, 10 months

Question regarding UmTRXv2 for early adopters should be ready in just few weeks

by SoftwareRadioGuy

Alexander, " UmTRXv2 samples for early adopters should be ready in just few weeks " per here: http://lists.osmocom.org/pipermail/umtrx/2012-October/000252.html And this page states: " Note: PCB layout will be published here when we start selling UmTRX boards. Prior to that it's available per request to our partners. " https://github.com/chemeris/umtrx-schematics Does this mean people whom purchase the UmTRXv2 Samples will be able to obtain the Schematics/Gerber Files ? Sincerely, SoftwareDefinedRadio

12 years, 10 months

UmTRX housing for labs usage.

by Andrey Sviyazov

Hi all. I spend this day in tries to find enclosure for UmTRX which are suggested to use in labs. I decided to return to my idea about fanless 5.25" tray form factor. I think they must look good, low cost and popular. It's all because mass production for competitive market. Examples: http://market.yandex.ru/model.xml?modelid=4957720&hid=818965 http://market.yandex.ru/model-spec.xml?modelid=2435964&hid=818965 http://market.yandex.ru/model.xml?modelid=1587657&hid=818965 http://www.amazon.de/gp/product/B004BUBND8/ref=olp_product_details?ie=UTF8&… http://www.amazon.de/Silentmaxx-HD-D%C3%A4mmung-Rev-2-0/dp/B001CKY4Y0/ref=p… http://www.amazon.de/Scythe-SCH-1000-Himuro-Festplattenk%C3%BChler/dp/B0017… And one question: Does anybody really uses USRP in closed enclosure? Best regards, Andrey Sviyazov.

12 years, 10 months

Re: UmTRX Digest, Vol 4, Issue 35

by Darby

1. Power supply, 12V-18V DC, >=20W. I think it's easier to find a PSU with a standard round DC connector, like this one and thus we need a converter cable to our Molex power connector. http://domino2.kycon.com/catalog_PDF/KLDX_SMT2.pdf Not knowing center pin polarity or exact center pin size, it seems as though digikey (http://www.digikey.com/product-search/en/power-supplies-external-internal-o…) has 348 that are 12-18v output, 10-20w, and have connectors that are 2.1mm ID to 2.5mm ID On a side note, for power -Something that could come in useful since its got ethernet, PoE? 2. Enclosure. We'd love to have a nice table-top enclosure for UmTRX, but it requires a significant effort to source, design and assemble. If anyone has some preexisting case designs, there's always protocase (protocase.com) or Rapid sheet metal (http://www.rapidsheetmetal.com/parts/enclosures.aspx) -Im sure theres plenty of other sheetmetal fabshops that will do custom work though, If youre wanting to use something a bit more generic -Theres enclosurehub.com

12 years, 10 months

UmTRX power adaptor

by Alexander Chemeris

Hi all, UmTRXv2 samples for early adopters should be ready in just few weeks and we're looking at what to put an a package. Below is a preliminary list of items which I think we should include. Please comment on the list and suggest particular items: 1. Power supply, 12V-18V DC, >=20W. I think it's easier to find a PSU with a standard round DC connector, like this one and thus we need a converter cable to our Molex power connector. http://domino2.kycon.com/catalog_PDF/KLDX_SMT2.pdf 2. Converter cable from the Molex power connector to a standard round DC connector. 3. U.FL-to-SMA-F pigtail cable. 4. Two small antennas - omni or patch. One for Tx and one for Rx. Below is a list of items which are non-essential and which we unlikely to include in the package for this batch. We do no have them ready yet and we don't want to delay shipping. We focus our effort on polishing UmTRX and UmSEL performance and software development which we see as a more important tasks at this moment. 1. Duplexer. Without a power amplifier UmTRXv2 is pretty low-power (50-100mW) and thus it works good enough without a duplexer in a normal environment. For our testing we use two small antennas - one for Rx and one for Tx without any issues. 2. Enclosure. We'd love to have a nice table-top enclosure for UmTRX, but it requires a significant effort to source, design and assemble. 3. UmSEL. It's not clear whether we will have UmSEL production setup in time. Software to control UmSEL is yet to be developed as well. Since it's only an improvement frontend, I don't think we should include it into the basic package. If you want to help us make those items faster - by all means feel free to offer your help! :) * If you provide a valuable contribution, you'll get the item you're contributed to for free. * If you provide significant contributions on a regular basis, you'll get all our future hardware versions for free and recognition on the web-site. -- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru

12 years, 10 months

Storing calibration values in EEPROM

by Alexander Chemeris

Hi all, I've pushed an update to git to store some LMS6002D calibration values in UmTRX's EEPROM. The idea is to perform calibration once and do not worry about it anymore no matter what PC you connect UmTRX to. Intro ==== Right now we have the following values which could be stored in EEPROM: * tx-vga1-dc-i - DC offset calibration value for LMS6002D Tx I channel * tx-vga1-dc-q - DC offset calibration value for LMS6002D Tx I channel * tcxo-dac - TCXO calibration value Now, when the framework for UmTRX EEPROM is in place, we could store more values there as we see the need. E.g. we may want to store Rx DC offset calibration values or power limits of this exact units to be used by OpenBTS. The only limitation here is the size of the EEPROM. EEPROM is only 256 bytes large and some of them are already used, so we have about 200 bytes to use. With the strong dependency of calibration values on temperature and frequency, we might need a two-dimensional array for each value. In this case we may want to move those calibration values to flash instead of EEPROM. This would need some more work and thus is in our wish-list for now. Writing values =========== You could write values mentioned above to EEPROM as any other EEPROM value: ./host/build/utils/usrp_burn_mb_eeprom --key <name> --val <dec_val> (from the root of your UHD source tree) Reading values ============= You could read individual values from EEPROM as any other EEPROM value: ./host/build/utils/usrp_burn_mb_eeprom --key <name> --val <dec_val> (from the root of your UHD source tree) Or you could use `uhd_usrp_probe` to see them all at once at the top-level section: _____________________________________________________ / | Device: UmTRX Device | _____________________________________________________ | / | | Mboard: UMTRX-REV0 | | hardware: 64000 | | mac-addr: 00:50:c2:85:3f:ff | | ip-addr: 192.168.10.4 | | gpsdo: none | | serial: 1 | | tx-vga1-dc-i: 114 | | tx-vga1-dc-q: 138 | | tcxo-dac: 2022 | | | | Time sources: none, external, _external_, mimo | | Clock sources: internal, external, mimo | | Sensors: ref_locked | | _____________________________________________________ | | / | | | RX DSP: 0 | | | Freq range: -6.500 to 6.500 Mhz | | _____________________________________________________ | | / | | | RX DSP: 1 | | | Freq range: -6.500 to 6.500 Mhz | | _____________________________________________________ | | / | | | RX Dboard: A | | | ID: LMS RX (0xfa09) | | | Serial: 1 | | | _____________________________________________________ | | | / | | | | RX Subdev: 0 | | | | Name: LMS RX (0xfa09) - 0 | | | | Antennas: RX0, RX1, RX2, RX3, CAL | | | | Sensors: | | | | Freq range: 232.500 to 3720.000 Mhz | | | | Gain range VGA2: 0.0 to 30.0 step 3.0 dB | | | | Connection Type: IQ | | | | Uses LO offset: No | | | _____________________________________________________ | | | / | | | | RX Codec: A | | | | Name: LMS_RX | | | | Gain Elements: None | | _____________________________________________________ | | / | | | TX DSP: 0 | | | Freq range: -32.500 to 32.500 Mhz | | _____________________________________________________ | | / | | | TX Dboard: A | | | ID: LMS TX (0xfa07) | | | Serial: 1 | | | _____________________________________________________ | | | / | | | | TX Subdev: 0 | | | | Name: LMS TX (0xfa07) - 0 | | | | Antennas: TX0, TX1, TX2, CAL | | | | Sensors: | | | | Freq range: 232.500 to 3720.000 Mhz | | | | Gain range VGA: -35.0 to 21.0 step 1.0 dB | | | | Connection Type: IQ | | | | Uses LO offset: No | | | _____________________________________________________ | | | / | | | | TX Codec: A | | | | Name: LMS_TX | | | | Gain Elements: None PS I've added this text to the wiki for future reference: https://code.google.com/p/umtrx/wiki/UmTRXCalibration -- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru

12 years, 10 months

UmSEL Pdet and Vcnt

by Andrey Sviyazov

Hi Jean-Samuel. Pdet1&2 dedicated for Output power detectors and Vcnt1&2 for test points voltage control. For example, PA +24V and feeder supply voltage 28..36V of DC-DC converter (in case of positive type, i.e. minus connected to chassis). Each input of ADS1015 contains divider of 1:10, so it makes possible to measure up to 41V with 0.01V resolution. Best regards, Andrey Sviyazov. 2012/10/22 Jean-Samuel Najnudel - BJT PARTNERS SARL <jsn(a)bjtpartners.com> > Hi Andrey, > > I can see in the UmSEL 4 channels ADC. > > What do you plan to do with this ? > What is Pdet and Vcnt ? > > I ask you this because it would be really nice to use 2 of these ADC > channels to monitor each of the 2 PA RF Pout. > What would you think about this ? > > Best regards. > > Jean-Samuel. > :-) > >

12 years, 11 months

Re: T-Shirt

by Aaron deMello

I think the front of the T-shirt should read "FREE GSM" with the logo of a SIM card with little feet running. The back should have the Fairwaves Logo / URL. "FREE GSM" because it's a pun: free of cost thanks to open source, and free it from the shackles of the evil big black box infrastructure vendors. In terms of color, if a deep dark midnight blue (like Nike's "Obsidian" blue) would be awesome. This is for selfish reasons since all my gym wear is Obsidian blue :-) Oh and some T-shirts in European XXL or American XL would be nice for me. -- Aaron deMello Sent with Sparrow (http://www.sparrowmailapp.com/?sig) On Saturday, October 20, 2012 at 4:20 PM, umtrx-request(a)lists.osmocom.org wrote: > Send UmTRX mailing list submissions to > umtrx(a)lists.osmocom.org (mailto:umtrx@lists.osmocom.org) > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.osmocom.org/cgi-bin/mailman/listinfo/umtrx > or, via email, send a message with subject or body 'help' to > umtrx-request(a)lists.osmocom.org (mailto:umtrx-request@lists.osmocom.org) > > You can reach the person managing the list at > umtrx-owner(a)lists.osmocom.org (mailto:umtrx-owner@lists.osmocom.org) > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of UmTRX digest..." > > > Today's Topics: > > 1. Re: Open-source telecom t-shirts (Andrey Sviyazov) > 2. Re: Open-source telecom t-shirts (Andrey Bakhmat) > 3. Re: Open-source telecom t-shirts (Andrey Bakhmat) > 4. Re: Open-source telecom t-shirts (Andrey Sviyazov) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sat, 20 Oct 2012 14:12:48 +0400 > From: Andrey Sviyazov <andreysviyaz(a)gmail.com (mailto:andreysviyaz@gmail.com)> > To: Alexander Chemeris <alexander.chemeris(a)gmail.com (mailto:alexander.chemeris@gmail.com)> > Cc: Sylvain Munaut <246tnt(a)gmail.com (mailto:246tnt@gmail.com)>, umtrx(a)lists.osmocom.org (mailto:umtrx@lists.osmocom.org), Andrey > Bakhmat <Andrey.Bakhmat(a)fairwaves.ru (mailto:Andrey.Bakhmat@fairwaves.ru)>, Mahyuddin Husairi > <mahyuddin(a)gmail.com (mailto:mahyuddin@gmail.com)>, Christian Gagneraud <chris(a)techworks.ie (mailto:chris@techworks.ie)> > Subject: Re: Open-source telecom t-shirts > Message-ID: > <CAE9AREzGtueztHbZ3ak-sA9zAJ-TgBU9Kt6LJSKFJghp5OR7LA(a)mail.gmail.com (mailto:CAE9AREzGtueztHbZ3ak-sA9zAJ-TgBU9Kt6LJSKFJghp5OR7LA@mail.gmail.com)> > Content-Type: text/plain; charset="koi8-r" > > Hmm, I missed it. > But really not sure that Fairwaves will associated to the blue colors (and > vice versa) due to the blue logo. > It doesn't mean that all around must be in blue. > > Best regards, > Andrey Sviyazov. > (Sent from my mobile client) > 20.10.2012 13:43 ???????????? "Alexander Chemeris" < > alexander.chemeris(a)gmail.com (mailto:alexander.chemeris@gmail.com)> ???????: > > > Because blue is the Fairwaves color :) > > > > On Sat, Oct 20, 2012 at 1:42 PM, Andrey Sviyazov <andreysviyaz(a)gmail.com (mailto:andreysviyaz@gmail.com)> > > wrote: > > > And about colors - why blue? > > > On my opinion, dark green and golden contacts looks better. > > > At least blue and gold is not good combination for me. > > > It looks like church painting. > > > > > > Best regards, > > > Andrey Sviyazov. > > > (Sent from my mobile client) > > > > > > 20.10.2012 13:32 ???????????? "Andrey Sviyazov" <andreysviyaz(a)gmail.com (mailto:andreysviyaz@gmail.com)> > > > ???????: > > > > > > > Andrey. > > > > You could add HARDWARE word, to align text with vertical Sim. > > > > > > > > Best regards, > > > > Andrey Sviyazov. > > > > (Sent from my mobile client) > > > > > > > > 20.10.2012 13:01 ???????????? "Andrey Bakhmat" > > > > <Andrey.Bakhmat(a)fairwaves.ru (mailto:Andrey.Bakhmat@fairwaves.ru)> ???????: > > > > > > > > > > I suggest "Unlock communications for the rest of us!" - just another > > > > > option bring to a vote. > > > > > Vertical SIM looks good, but it was difficult for me to arrange it with > > > > > the text. If somebody wants to play with it, I can provide vector (AI) > > > > > files. > > > > > Superman style - good idea, previous versions of T-shirt was slightly > > > > > boring. So I propose make something informal at the back side. > > > > > > > > > > On Sat, Oct 20, 2012 at 1:03 AM, Sylvain Munaut <246tnt(a)gmail.com (mailto:246tnt@gmail.com)> > > wrote: > > > > > > > > > > > > > > I like "Telecom wants to be free" slogan more, but that's just me. > > > > > > > > > > > > > "Telecom Wants to be Open"? > > > > > > > > > > > > I prefer "Telecom wants to be Free" too. (upper case F) > > > > > > > > > > > > and I also prefer the sim to be vertical. > > > > > > > > > > > > > > > > > > Just my 2c > > > > > > > > > > > > Cheers, > > > > > > > > > > > > Sylvain > > > > > > > > > > > > > > > > > > > > > > > > > -- > > > > > Best regards, > > > > > Andrey Bakhmat > > > > > COO, Fairwaves LLC > > > > > http://fairwaves.ru > > > > > > > > > > > > > > > > > > > > > > -- > > Regards, > > Alexander Chemeris. > > CEO, Fairwaves LLC / ??? ??????? > > http://fairwaves.ru > > > >

12 years, 11 months

Open-source telecom T-shirts

by Alexander Chemeris

Hi all, We're thinking about making T-shirts with open-source telecom. I've posted a call for ideas in my OpenBTS blog - please contribute. Telecom needs more openness and you could help us promote this! http://openbts.chemeris.ru/2012/10/reklama-open-source-telecom/ We plan to give them for free to the first 10-20 UmTRX buyers. Then you'll be able to buy them from our web-shop or from one of our friends and distributors. If you proposal gets printed, you'll get a free T-shirt as well. PS If you know a good online T-shirt printing service in US or Europe - drop me a line. I've never done this in US/Europe before. -- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru

12 years, 11 months

LMS6002D support of LTE

by Alexander Chemeris

Hi Srdjan, We're looking into re-purposing UmTRX for LTE and there a few things which we need to understand better. 1. Is it possible to support 15MHz and 20MHz LTE channel bandwidths? To achieve this we at least need to sample at 23.04Msps and 30.72Msps respectively. LMS6002D datasheet specifies the maximum I/Q samplerate of 14Msps, which is not enough. But at the same time, datasheet claims that ADC and DAC are specified up to 50Msps. How does this fits together? 2. Do you have any experience what maximum output power we could achieve with LMS and proper amplifiers, while still staying in the bounds of the LTE Standard? What would be the limiting factor for the further power increase? 3. Is there any issues using TDD mode in LMS6002D? We've been using onnly FDD mode so far and it would be great to know what issues could we expect when switching to TDD mode. -- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru

12 years, 11 months

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UmTRX October 2012