October 2012 - UmTRX - lists.osmocom.org

by Alexander Chemeris

(forwarding to the UmTRX mailing list) On Fri, Oct 19, 2012 at 7:33 PM, Ivan Kluchnikov <Ivan.Kluchnikov(a)fairwaves.ru> wrote: > Just sketch :) Nice idea. The last symbol would be better to have in the form of a SIM-card, imho. -- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru

11 years, 4 months

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Re: UmTRX Digest, Vol 4, Issue 45

by Darby

> Decreasing power consumption to 10-11W would allow us to use lighter > enclosure for the lab version, which is nice. at 20w of power consumption, this comes to roughly 68btu of generated heat -Is there a reason convection cooling in a sheetmetal enclosure wouldent work for this board?

11 years, 5 months

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Re: UmTRXv2 samples expected shortage

by Jean-Samuel Najnudel - BJT PARTNERS SARL

Hi Andrey, Do you think it will be possible to decrease the power consumption and to keep the best possible performances for industrial applications ? I know you cannot be sure about this but I would like to know how confident you feel about this ? Best regards. Jean-Samuel. :-) On Wed, Oct 31, 2012 at 7:40 PM, Andrey Sviyazov <andreysviyaz(a)gmail.com>wrote: > Hi Jean-Samuel, Alexander. > > Tomorrow I'll let you know what possible to make on time. > And we should set time limit for this. > For example, next morning. > > Best regards, > Andrey Sviyazov. > (Sent from my mobile client) > 31.10.2012 22:24 пользователь "Jean-Samuel Najnudel - BJT PARTNERS SARL" < > jsn(a)bjtpartners.com> написал: > > Hi Alexander, >> >> Thank you very much for your reply. >> >> Why skip/populate LMS power supply block ? >> As I understand we always need the LMS power supply block. I probably >> missed something. Could you explain this in more details to let me better >> understand ? >> >> Thanks a lot for your help. >> >> Best regards. >> >> Jean-Samuel. >> :-) >> >> >> On Wed, Oct 31, 2012 at 7:14 PM, Alexander Chemeris < >> alexander.chemeris(a)gmail.com> wrote: >> >>> Yes, lesser input voltage range makes sense only if it saves >$10 >>> and/or considerably increases power efficiency. I think this not the >>> case, and then only these changes will be needed: >>> >>> * traditional power connector >>> * MCX RF connector, because they sustain much more connect-disconnect >>> cycles >>> * lower power consumption mod >>> >>> I would appreciate if we could keep the same PCB for both versions and >>> populate the proper version of power connector/RF connector and >>> skip/populate LMS power supply block. >>> >>> On Wed, Oct 31, 2012 at 9:56 PM, Jean-Samuel Najnudel - BJT PARTNERS >>> SARL <jsn(a)bjtpartners.com> wrote: >>> > Hi Alexander, >>> > >>> > This would be much easier to have the same board for both lab and >>> > deployment. Only the UmSEL would make the difference. >>> > For deployment, I really need wide input voltage range as I plan to >>> power >>> > the whole system (UmTRX + PA) with a single 28V supply. >>> > Even if this can save a few euros, I would really prefer we do not >>> make the >>> > input voltage range smaller. >>> > By the way, even for lab, it might be convenient and it can avoid >>> damages in >>> > case of wrong voltage supply. >>> > >>> > Best regards. >>> > >>> > Jean-Samuel. >>> > :-) >>> > >>> > >>> > >>> > On Wed, Oct 31, 2012 at 6:50 PM, Alexander Chemeris >>> > <alexander.chemeris(a)gmail.com> wrote: >>> >> >>> >> Andrey, how much time do you need to create 2.1? If it's mire than a >>> day, >>> >> we should postpone this. I believe that enclosure is a much more >>> important >>> >> issue at this moment. >>> >> >>> >> I think we need following changes for the lab version: >>> >> * traditional power connector >>> >> * MCX RF connector, because they sustain much more connect-disconnect >>> >> cycles >>> >> * lower power consumption mod >>> >> * smaller input voltage range (only if this makes things cheaper) >>> >> >>> >> Sent from my Android device. >>> >> >>> >> -- >>> >> Regards, >>> >> Alexander Chemeris >>> >> CEO, Fairwaves LLC >>> >> http://fairwaves.ru >>> >> >>> >> 31.10.2012 14:05 пользователь "Andrey Sviyazov" < >>> andreysviyaz(a)gmail.com> >>> >> написал: >>> >> >>> >>> Hi Jean-Samuel. >>> >>> >>> >>> First of all, you didn't said about delay duration :) >>> >>> I can't delay this batch just due to my wishes that each next batch >>> >>> should work more and more ideally. >>> >>> >>> >>>> These modifications looks interesting. I think it is a good idea. >>> >>> >>> >>> Hope so. >>> >>> >>> >>>> >>> >>>> I just have a few question. >>> >>>> >>> >>>> Why do you call this board revision 2.1 "a special batch for labs" ? >>> >>>> Would these modifications make this revision 2.1 also more suitable >>> for >>> >>>> field deployment, at least as much as the revision 2.0 ? >>> >>> >>> >>> Because of I can fix only known issues. >>> >>> Also not all really required improvements are known yet. >>> >>> >>> >>>> Decreasing power consumption to 10..11 W would be great. Is there >>> any >>> >>>> drawbacks of this modification ? Would it decrease some >>> performances ? If >>> >>>> not, this modifiction to decrease power consumption is a >>> significant very >>> >>>> good modification. >>> >>> >>> >>> Decreasing of performances it is only spurs with DC/DC conversion >>> freq >>> >>> ~500kHz. >>> >>> Now I searching more good LC filter to suppress it better than >>> TI2012U601 >>> >>> can. >>> >>> >>> >>>> Do you have enough space on the board to replace some U_FL >>> connectors >>> >>>> with MCX connectors as you suggest ? >>> >>> >>> >>> Yes, but may be not all should be MCX. >>> >>> Of course I did not insist, but just asking whether there is a >>> reason to >>> >>> do it or not. >>> >>> >>> >>>> An external LNA would probably need around 5 Volts instead of 6V. A >>> >>>> small PA would probably need a little bit higher voltage. Do you >>> think it >>> >>>> would be possible to have a variable voltage low power connector ? >>> >>> >>> >>> On my opinion, variable voltage is not good idea. >>> >>> For example for LNA's better to place low noise LDO 6V to 5V near to >>> IC's >>> >>> to get Vcc clean too. >>> >>> >>> >>>> By the way, could you pelase also add the 2 LMS output matching >>> >>>> capacitors we need to improve output power figures in the 1800 band >>> ? >>> >>> >>> >>> Of course, because it is issue which should be fixed, but not >>> >>> improvement. >>> >>> >>> >>> Best regards, >>> >>> Andrey Sviyazov. >>> > >>> > >>> >>> >>> >>> -- >>> Regards, >>> Alexander Chemeris. >>> CEO, Fairwaves LLC / ООО УмРадио >>> http://fairwaves.ru >>> >> >>

11 years, 5 months

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LNA and Noise Figure improvement

by Alexander Chemeris

Forwarding to the mailing list. ---------- Forwarded message ---------- From: Jean-Samuel Najnudel - BJT PARTNERS SARL <jsn(a)bjtpartners.com> Date: Tue, Oct 30, 2012 at 6:25 PM Subject: LNA and Noise Figure improvement Hi Andrey, I understand you plan to prepare the UmTRXv3. I would need to discuss about the Rx Noise Figure improvement. With UmSEL, according to your calculations, NF would be around 0.7 dB (excluding duplexer IL) with the MGA-13116. It would be interesting to try to improve this figure with a very first stage LNA based on the MGA-633P8. This would let us reach a NF as low as about 0.4 dB. Adding this very first stage LNA in the Rx path brings a few questions. 1/ To improve isolation with the other RF parts, would we need to have this LNA in a separate shielded enclosure ? If yes, we would need a 5V power supply for this LNA. To have a better shielding between the voltage regulator circuitery and the LNA, it should be nice to have the 5V voltage regulator outside of the LNA enclosure. To make this possible, it would be very useful to add a 5V voltage regulator and connector on the UmTRXv3. If not, we do not need specific modifications on the UmTRXv3 but we would need to add an MGA-633P8/634P8 as a very first stage in the UmSEL. 2/ Whatever external or on the UmSEL, this extra LNA will increase the total gain. Considering your calculation, the UmSEL IIP3 is already as low as around 1 dBm. If we add a very first stage LNA, this IIP3 will go down to about -15 dBm. This could be a problem for inband blockers. Even if, in real life situation in the field, I am not sure it will be a very big problem, it will be a problem to pass the spec. Would you have another idea to improve the NF ? If not, could you please let me know what NF we could expect with the current design (UmSEL with MGA-13116/13216) in both 900 and 1800 bands ? Best regards. Jean-Samuel. :-) -- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru

11 years, 5 months

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GSM MAP for incoming roaming

by Dmitri Soloviev

Hi I'm preparing to implement a legacy GSM roaming for OpenBTS network. To start with, I'm trying to get a minimal list of mandatory MAP services to allow foreign subscribers to roam inside OpenBTS. CAMEL is not discussed now. Your help is appreciated. Regards, Dmitri MAP_UPDATE_LOCATION+ MAP_CANCEL_LOCATION+ MAP_SEND_IDENTIFICATION-? MAP_PURGE_MS+ MAP_UPDATE_GPRS_LOCATION MAP-NOTE-MM-EVENT MAP_PAGE MAP_SEARCH_FOR_MS MAP_PROCESS_ACCESS_REQUEST MAP_PREPARE_HANDOVER MAP_SEND_END_SIGNAL MAP_PROCESS_ACCESS_SIGNALLING MAP_FORWARD_ACCESS_SIGNALLING MAP_PREPARE_SUBSEQUENT_HANDOVER MAP_ALLOCATE_HANDOVER_NUMBER MAP_SEND_HANDOVER_REPORT MAP_AUTHENTICATE MAP_SEND_AUTHENTICATION_INFO+ MAP_AUTHENTICATION_FAILURE_REPORT? MAP_SET_CIPHERING_MODE MAP_CHECK_IMEI MAP_OBTAIN_IMEI MAP-INSERT-SUBSCRIBER-DATAneeded later? MAP-DELETE-SUBSCRIBER-DATAneeded later? MAP-PROVIDE-IMSI MAP-FORWARD-NEW-TMSI MAP_RESET+? MAP_FORWARD_CHECK_SS_INDICATION-? MAP_RESTORE_DATA+? MAP-ANY-TIME-INTERROGATION MAP-PROVIDE-SUBSCRIBER-INFO-? MAP-ANY-TIME-SUBSCRIPTION-INTERROGATION MAP-ANY-TIME-MODIFICATION MAP-NOTE-SUBSCRIBER-DATA-MODIFIED MAP-ACTIVATE-TRACE-MODE-? MAP-DEACTIVATE-TRACE-MODE-? MAP-TRACE-SUBSCRIBER-ACTIVITY MAP-SEND-IMSI MAP_SEND_ROUTING_INFORMATION MAP_PROVIDE_ROAMING_NUMBER+ MAP_RESUME_CALL_HANDLING-? MAP_PREPARE_GROUP_CALL MAP_PROCESS_GROUP MAP_FORWARD_GROUP_CALL_SIGNALLING MAP_SEND_GROUP_CALL_END_SIGNAL MAP_SEND_GROUP_CALL_INFO MAP_SET_REPORTING_STATE-? MAP_STATUS_REPORT-? MAP_REMOTE_USER_FREE-? MAP_IST_ALERT-? MAP_IST_COMMAND-? MAP_RELEASE_RESOURCES+? MAP_REGISTER_SS-? MAP_ERASE_SS-? MAP_ACTIVATE_SS-? MAP_DEACTIVATE_SS-? MAP_INTERROGATE_SS-? MAP_REGISTER_PASSWORD-? MAP_GET_PASSWORD-? MAP_PROCESS_UNSTRUCTURED_SS_REQUEST-? MAP_UNSTRUCTURED_SS_REQUEST-? MAP_UNSTRUCTURED_SS_NOTIFY-? MAP_SS_INVOCATION_NOTIFY MAP_REGISTER_CC_ENTRY MAP_ERASE_CC_ENTRY MAP-SEND-ROUTING-INFO-FOR-SM MAP-MO-FORWARD-SHORT-MESSAGE MAP-REPORT-SM-DELIVERY-STATUS MAP-READY-FOR-SM-? MAP-ALERT-SERVICE-CENTRE-? MAP-INFORM-SERVICE-CENTRE MAP-SEND-INFO-FOR-MT-SMS MAP-SEND-INFO-FOR-MO-SMS MAP-MT-FORWARD-SHORT-MESSAGE+ MAP-MT-FORWARD-SM-FOR-VGCS MAP_SEND_ROUTING_INFO_FOR_GPRS MAP_FAILURE_REPORT MAP_NOTE_MS_PRESENT_FOR_GPRS MAP-SEND-ROUTING-INFO-FOR-LCS MAP-PROVIDE-SUBSCRIBER-LOCATION MAP-SUBSCRIBER-LOCATION-REPORT

11 years, 5 months

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UmTRX issue

by Alexander Chemeris

Hi Thomas, Could you please describe symptoms which you observe on your UmTRX? We have to figure out the reason for the improper behavior and if this is a manufacturing issue - make sure this won't happen for the next batch. -- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru

11 years, 5 months

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Re: UmTRXv2 samples expected shortage

by Jean-Samuel Najnudel - BJT PARTNERS SARL

Hi Alexander, Thank you very much for your reply and detailled explainations. Now I understand. My point of view is we do not really care of a few watts power consumption saving for the lab version. At worst, we can still add a fan in the lab enclosure, as for the USRP which also dissipate up to about 15 Watts. On the other side, it makes a lot of sense to save some power consumption for the industrial version as, on the field, every watt counts and we also need to dissipate the heat without fan for better reliability. Considering this, I believe as follow. Either we are able to decrease the power consumption and keep good enough performances for industrial applications. In this case, we should make this modification for both lab and industrial versions. Either decreasing the power consumption will decrease the performances. In this case, I do not think this worth making this modification at all. In both cases, I would suggest we keep the same design for both lab and industrial versions, either with or without the modification. Moreover, if both lab and industrial versions are the same, except connectors may be, debug from lab users may help industrial users and debug from industrial users may help lab users. This would be really easier to get a reliable single board for both lab and industrial applications. Best regards. Jean-Samuel. :-) On Wed, Oct 31, 2012 at 7:30 PM, Alexander Chemeris < alexander.chemeris(a)gmail.com> wrote: > On Wed, Oct 31, 2012 at 10:23 PM, Jean-Samuel Najnudel - BJT PARTNERS > SARL <jsn(a)bjtpartners.com> wrote: > > Why skip/populate LMS power supply block ? > > As I understand we always need the LMS power supply block. I probably > missed > > something. Could you explain this in more details to let me better > > understand ? > > If I understand correctly, this is the modification which Andrey is > testing - avoid additional power conversion near LMS. We may need it > for better performance for industrial version, but we most likely do > not need it for the lab version. > > Decreasing power consumption to 10-11W would allow us to use lighter > enclosure for the lab version, which is nice. > > PS I'd love to move this discussion to the public UmTRX mailing list. > Is it fine with you? Actually, if you feel fine, you could start such > discussion at the public UmTRX mailing list from the beginning. > > -- > Regards, > Alexander Chemeris. > CEO, Fairwaves LLC / ООО УмРадио > http://fairwaves.ru >

11 years, 5 months

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Multicarrier OpenBTS on UmTRX

by Thomas Tsou

Hi all, I spent some time yesterday testing UmTRX with MCBTS. Aside from some trivial fixes (inverted sample rate), the code ran fine with no issues. The default bandwidth of the LPF was insufficient, so that was widened. I tested with 9 handsets between 3 and 7 carriers on a Core2 Duo (P7570) laptop. git://github.com/ttsou/openbts-multi-arfcn.git umtrx Configuration is through sqlite database, which is unchanged from mainline; just set the number of ARFCN (7 max) and C1 channels. Because of the bandwidth involved, be sure to increase the maximum buffer sizes for UHD. The uhd_usrp_probe utility will warn if the target size cannot be set. http://files.ettus.com/uhd_docs/manual/html/transport.html#linux-specific-n… Design ===== There are three resampling stages. 1. Outer resampler converts from the device rate to a multiple of the 400 kHz channel spacing. 2. Channelizer demultiplexes input stream to M channels 3. Inner resampler converts from 400 kHz to a multiple of the GSM symbol rate. UmTRX rates: Channelizer Rate Device Rate Decimation 1.6 Msps 1.625 Msps 8 3.2 Msps 3.250 Msps 4 Options ====== To broadcast dummy bursts on all carriers for spectrum testing, uncomment the following preprocessor declaration in radioParams.h. #define ENABLE_ALL_CHANS With dummy bursts on all carriers: http://filebox.vt.edu/users/ttsou/http/7carrier_umtrx.PNG Calibration ======== Calibration remains a concern. With single carrier, the carrier leakage and and IQ imbalance appear as in-band distortion. For MCBTS, OpenBTS offsets C0 on to the lowest carrier. This makes the carrier and image quite visible, as shown in the following uncalibrated capture. I checked with a swept tone to verify that this issue was not a result of baseband DSP. The USRP also shows similar effects. http://filebox.vt.edu/users/ttsou/http/carrier_image.PNG Any idea how much carrier and image suppression we should expect with calibration on UmTRXv2? Thomas

11 years, 5 months

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UmTRXv2 Beta: Whats the maximum # of simultaneous callers

by SoftwareRadioGuy

Hello, I've read that the # of maximum callers is 15. Since there are "Beta" version coming out will these be able to handle 15 simultaneous callers too? SoftwareDefinesRadio

11 years, 5 months

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Superb potential! Re: UmTRXv2 Beta: Whats the maximum # of simultaneous callers

by SoftwareRadioGuy

Alexander, Superb potential of the device you and the Fairwaves team are bringing to fruition. I also look forward to your future potential product, UmTRXv3 4G/LTE. I know its just something your team and you have thought about publically, alot of us would love to see such. Thank you for your responses. SoftwareDefinesRadio On Tue, Oct 30, 2012 at 5:07 AM, Alexander Chemeris < alexander.chemeris(a)gmail.com> wrote: > Hi, > > On Tue, Oct 30, 2012 at 12:36 PM, SoftwareRadioGuy > <softwaredefinesradio(a)gmail.com> wrote: > > I've read that the # of maximum callers is 15. > > > > Since there are "Beta" version coming out will these be able to handle 15 > > simultaneous callers too? > > A short answer is "yes, after a software update". > > A longer answer is that hardware supports dual-TRX operation, but > software support is not there yet. We might be able to fix software > before we ship beta units, but even if not - you will be able to get > the software update later. > Also keep in mind, that UmTRX should be able to run multi-ARFCN > OpenBTS and in this case it'll be able to handle much more calls. We > haven't tested this mode of operation extensively yet, but > theoretically we might be able to support 14ARFCNs (2x7ARFCN) which > equals to (14*8-1)=111 calls. At this scale you're most likely limited > by computing power of your PC rather then UmTRX hardware. Whether we > could get UmTRX in Multi-ARFCN mode through certification or not is > still a question, but it should be fine for lab testing. > > > -- > Regards, > Alexander Chemeris. > CEO, Fairwaves LLC / ООО УмРадио > http://fairwaves.ru >

11 years, 5 months

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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 > >> >

11 years, 5 months

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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

11 years, 5 months

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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.

11 years, 5 months

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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

11 years, 5 months

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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

11 years, 5 months

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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

11 years, 5 months

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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. > :-) > >

11 years, 5 months

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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 > > > >

11 years, 6 months

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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

11 years, 6 months

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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

11 years, 6 months

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FPGA project for UmTRX v2 board

by Andrew Karpenkov

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

11 years, 6 months

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The need of duplexer in low power operation

by Alexander Chemeris

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

11 years, 6 months

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LPF Bandwidth Tuning with LMS6002

by Gillian Seed

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

11 years, 6 months

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ET1011C2 1GbE PHY availability

by Alexander Chemeris

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

11 years, 6 months

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UmTRXv2-- it's alive!

by Robin Coxe

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

11 years, 6 months

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UmTRX October 2012