UmTRXv2 final project

Jean-Samuel Najnudel - BJT PARTNERS SARL jsn at bjtpartners.com
Tue Jul 3 20:13:12 UTC 2012


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.
>>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>
>>>>
>>>
>>
>



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