UmTRXv2 final project

Alexander Chemeris alexander.chemeris at gmail.com
Tue Jul 3 21:17:37 UTC 2012


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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