This is merely a historical archive of years 2008-2021, before the migration to mailman3.
A maintained and still updated list archive can be found at https://lists.osmocom.org/hyperkitty/list/UmTRX@lists.osmocom.org/.
Alexander Chemeris alexander.chemeris at gmail.comM25P64-VMF6P is a RoHS version of M25P64-VMF6 and thus is fine. M25P64-VMF6TP should be fine as well (it's a packaging option). Check out p50 of the datasheet: http://www.farnell.com/datasheets/1499242.pdf On Wed, Jul 4, 2012 at 12:13 AM, Jean-Samuel Najnudel - BJT PARTNERS SARL <jsn at bjtpartners.com> wrote: > Hi Andrey, > > I have some updates regarding the M25P64-VMF6. > Please confirm the M25P64-VMF6P would be fine. > If yes, we can find this at less than 2 Euros. There is no problem. > This component is fine and we do not need to replace it on the PCB. > If not, please let me know which other part number could be fine. This > would help me to find this component at a good price. > > By the way, just a question, some distributors (eg: mouser) show this > component as obsolete. What do you think ? Are you sure we will not > have any problem to get this component for volume production in the > future ? > > Please let me know. > > Best regards. > > Jean-Samuel. > :-) > > > On 7/3/12, Jean-Samuel Najnudel - BJT PARTNERS SARL <jsn at bjtpartners.com> wrote: >> Hi Alexander, >> >> Thank you very much for your e-mail. >> >> 1/ They did not started the PCB manufacturing yet. They are still >> waiting for my feedback on the questions I asked to Andrey. >> >> Actually, if we need to replace the SRAM and/or the flash to use >> cheaper equivalent components, we may need to reroute the PCB. This is >> why I ask them to wait for the feedback from Andrey before starting >> the PCB production. They can start as soon as we let them know what we >> do about the SRAM and the flash (with or without PCB files update). >> >> Anyway, I was not very worried about the delay. As discussed together >> last time in Paris, before deploying the UmTRX on the field, we would >> need OpenBTS to support handover. Even for tests, if I open the >> network without handover, because of the terrain in Mayotte, there >> will be so much call drops nobody in Mayotte will accept to use our >> network anymore in the future. Really, handover is very important in >> Mayotte. >> >> As I understand OpenBTS is under development but it is quite hard >> work. It will probably not be ready before the end of this summer. >> This is why I did not feel very worried about the PCB production >> delay. >> >> Anyway, I will do my best to get the UmTRX prototypes ready as soon as >> possible. I just need a feedback from Andrey because, if it does not >> lower the UmTRX board performances, we should really try to find an >> alternative solution to use cheaper SRAM and flash chips. This could >> improve a lot the cost structure of the UmTRX. >> >> 2/ I did not contacted Lime yet but I will do this as soon as >> possible. I will do my best to get the LMS chips on time. >> >> By the way, for both PCB assembly and LMS order, how many UmTRX board >> would you like the fab makes ? We discussed together about 5 or 10 >> units but we did not took the final decision yet. It can be any >> reasonable number between 5 and 10. Please let me know the quantity >> you would need. I will ask the fab and order the component quantities >> we need. >> >> By the way, the meeting with the fab this morning was fine and they >> are ready to start the production asap. >> >> Andrey, please let me know your feedback about my last e-mail and I >> will push this to the fab asap. >> >> Thanks a lot for your help. >> >> Best regards. >> >> Jean-Samuel. >> :-) >> >> >> On 7/3/12, Alexander Chemeris <alexander.chemeris at gmail.com> wrote: >>> Hi Jean-Samuel, >>> >>> Thank you for the update! Andrey and I have just arrived back to Moscow, >>> hopefully he will be able to answer tomorrow. >>> >>> Few questions from me: >>> >>> 1. Have they started PCB manufacturing already? With 3w of manufacturing >>> time it would be better to start manufacturing asap. >>> >>> 2. Have you contacted Lime to get more LMS chips? >>> >>> Sent from my Android device. >>> >>> -- >>> Regards, >>> Alexander Chemeris >>> CEO, Fairwaves LLC >>> http://fairwaves.ru >>> 02.07.2012 22:16 пользователь "Jean-Samuel Najnudel - BJT PARTNERS SARL" >>> < >>> jsn at bjtpartners.com> написал: >>> >>>> Hi Andrey, >>>> >>>> I have some news from the fab today and I have a meeting with them >>>> tomorrow morning. >>>> >>>> They sent me the BOM with components price list. This bring me a few >>>> questions. >>>> >>>> 1/ Would you know a distributor for the Murata chokes ? The fab them to >>>> have some issue to source these. >>>> >>>> 2/ Would you suggest a distributor for the GPS chip ? >>>> >>>> 3/ The CY7C1460AV33-167AXI costs more than 50 Euros on the list ! I know >>>> SRAM is expensive but would you know where we could purchase this >>>> component >>>> at a lower price ? If not, do you think we could use a cheaper but >>>> equivalent SRAM chip ? >>>> >>>> 4/ The M25P64-VMF6 costs more than 20 Euros on the list ! This is huge >>>> for >>>> a 64M flash. Would you know where we could purchase this component at a >>>> lower price ? If not, do you think we could use a cheaper but equivalent >>>> flash chip ? >>>> >>>> Please let me know about this. This would help me a lot to move forward >>>> to >>>> the next sample production step. >>>> >>>> Thanks a lot for your help. >>>> >>>> Best regards. >>>> >>>> Jean-Samuel. >>>> :-) >>>> >>>> >>>> On Mon, Jun 18, 2012 at 11:19 AM, Jean-Samuel Najnudel - BJT PARTNERS >>>> SARL >>>> <jsn at bjtpartners.com> wrote: >>>> >>>>> Hi Andrey, >>>>> >>>>> I sent the files last week. The fab needs a few days to update its >>>>> pricing and launch the production process. >>>>> Anyway, I just called them today. Work is in progress. They will >>>>> provide >>>>> me with some updates later this week. They confirm this should not take >>>>> too >>>>> much time for production and they will anyway contact me if they need >>>>> anything. >>>>> I will let you know asap. >>>>> >>>>> Best regards. >>>>> >>>>> Jean-Samuel. >>>>> :-) >>>>> >>>>> >>>>> >>>>> On Mon, Jun 18, 2012 at 9:49 AM, Andrey Sviyazov >>>>> <andreysviyaz at gmail.com>wrote: >>>>> >>>>>> Hi Jean-Samuel. >>>>>> >>>>>> Took another week, but still no news from you. >>>>>> Could you please inform us about the progress in the production of >>>>>> prototypes. >>>>>> >>>>>> Best regards, >>>>>> Andrey Sviyazov. >>>>>> >>>>>> >>>>>> >>>>>> 2012/6/13 Andrey Sviyazov <andreysviyaz at gmail.com> >>>>>> >>>>>>> Hi Jean-Samuel. >>>>>>> >>>>>>> Please inform us about fabrication progress even there are no issues. >>>>>>> >>>>>>> Best regards, >>>>>>> Andrey Sviyazov. >>>>>>> (Sent from my mobile client) >>>>>>> 12.06.2012 4:48 пользователь "Andrey Sviyazov" >>>>>>> <andreysviyaz at gmail.com> >>>>>>> написал: >>>>>>> >>>>>>> Here PcbDoc file @ 12/06/2012 . >>>>>>>> So, it all done :) >>>>>>>> >>>>>>>> Best regards, >>>>>>>> Andrey Sviyazov. >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> 2012/6/12 Andrey Sviyazov <andreysviyaz at gmail.com> >>>>>>>> >>>>>>>>> Hi all! >>>>>>>>> >>>>>>>>> Here final project UmTRXv2 @ 12/06/2012 (PcbDoc file will be >>>>>>>>> attached >>>>>>>>> to the next e-mail). >>>>>>>>> I found an mistake with non-SMD LED's positions in compare to Ettus >>>>>>>>> where A-B in left-to-right orientation (see picture). >>>>>>>>> Andrew Karpenkov suggested me to change it because of it is not yet >>>>>>>>> standard but people accustomed to this. >>>>>>>>> It is done. >>>>>>>>> >>>>>>>>> Also he suggest me to make four test points for RXOUT legs of LMS >>>>>>>>> because he work with this now and found it helpfull. >>>>>>>>> It is done. >>>>>>>>> >>>>>>>>> Also test points which without connector now referenced as TST and >>>>>>>>> therefore RefDes of some connectors changed. >>>>>>>>> >>>>>>>>> Jean-Samuel, please find Gerber files, NC drill and layer stack >>>>>>>>> desription files which usually required to produce PCB. >>>>>>>>> >>>>>>>>> Best regards, >>>>>>>>> Andrey Sviyazov. >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> 2012/6/10 Andrey Sviyazov <andreysviyaz at gmail.com> >>>>>>>>> >>>>>>>>>> Hi all! >>>>>>>>>> >>>>>>>>>> Here final project UmTRXv2 @ 10/06/2012 (PcbDoc file will be >>>>>>>>>> attached to the next e-mail). >>>>>>>>>> Jean-Samuel, please check SMD LED's placed at the front edge of >>>>>>>>>> the >>>>>>>>>> PCB. >>>>>>>>>> If you agree with this variant then I'll generate Gerber files vs >>>>>>>>>> required layers and description to produce PCB. >>>>>>>>>> If anybody find any mistake, please inform me immediatelly. >>>>>>>>>> >>>>>>>>>> Best regards, >>>>>>>>>> Andrey Sviyazov. >>>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>> >>>>>> >>>>> >>>> >>> >> -- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru