UmTRXv2 final project

Jean-Samuel Najnudel - BJT PARTNERS SARL jsn at bjtpartners.com
Wed Jul 4 10:28:04 UTC 2012


Hi Alexander,

Thanks a lot for your reply.
This is good news. The M25P64-VMF6P costs less than 2 Euros on Avnet
Express.
By the way, now I understand why the fab quoted me more than 20 Euros for
this flash. Farnell France seems to sell this at 21.38 Euros !
Anyway, no problem. I will order through Avnet Express.

Best regards.

Jean-Samuel.
:-)


On Tue, Jul 3, 2012 at 11:17 PM, Alexander Chemeris <
alexander.chemeris at gmail.com> wrote:

> M25P64-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
>
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