Best regards,

Andrey Sviyazov.

2012/7/30 Andrey Sviyazov <andreysviyaz@gmail.com>

Hi Jean-Samuel.

Here are attached last versions of interactive PDF for assembly and schema, and BOM (rename zi_ to zip first).
List of components which are changed:
L6-1, L6-2 = R0603 0 Ohm instead of choke

C45-1, C45-2 = Do Not Install
C82-1, C82-2, C98-1, C98-2 = 100pF instead of 470pF
C83-1, C83-2, C99-1, C99-2 = 1500pF instead of 8.2nF
C84-1, C84-2, C97-1, C97-2 = 33pF instead of 150pF

R106-1, R106-2, R121-1, R121-2 = 2k2 instead of 820 Ohm
R109-1, R109-2, R119-1, R119-2 = 3k3 instead of 1.2 kOhm

Best regards,
Andrey Sviyazov.

2012/7/25 Andrey Sviyazov <andreysviyaz@gmail.com>
Hi Jean-Samuel.

First of all you're right, we can't delay production.
So, I am sure it is better if PCB production will continue as you suggest.

There are only three hardware issues which have to be solved before assembling:

1) Improving LMS phase noise.
It is almost done and Alexander wrote you which component need to order.

2) Digital noise which born in GPS module 230.
In ver.2 we will use GPS module 570, but I am afraid that we can get the same problems.

So, I need 1-2 days to workaround this issue.
And also we have to understand either it important or it doesn't because this noises hided under modulation.

3) LMS engineers suggested us to use PLL loop filter 100kHz instead 50kHz.

In case of 100kHz we have to decrease charge-pump current from 1.2-1.9mA down to 0.4mA, but I am afraid about integral phase noise of LO because (possible) it can affect modulation phase error (in degrees).
I think, required 1-2 days (the same days) to understand this also.

So, at Thirsday I will send you final BOM and assembly files.
Hope it doesn't delay production, otherwise tell me and we'll hurry up.

Best regards,
Andrey Sviyazov.

2012/7/24 Alexander Chemeris <alexander.chemeris@gmail.com>
Hi Jean-Samuel,

We're sitting together with Andrey Sviyazov now and he says that it's
fine to continue with this PCB.

You will need 40pcs of this 0 Ohm jumpers (2pcs per board):
http://fr.farnell.com/bourns/cr0603-j-000elf/resistor-0603-0r-5-0-1w/dp/2008343

Andrey will update the schematics and BoM later today.

On Tue, Jul 24, 2012 at 2:13 PM, Jean-Samuel Najnudel - BJT PARTNERS

SARL <jsn@bjtpartners.com> wrote:
> Hi Andrey,
>
> PCB copper is ready yet. We will lose 560 Euros and 3 weeks delay if we
> change the copper. It is not impossible, we can decide to do that but I
> would suggest we change the PCB for the next batch. After testing the v2
> board, you may found more changes we need on the copper.
>
> The board itself is not ready. We can change some passives. This will not
> cost anything (or almost) and extra delay will be just one or two days at
> most.
>
> Please let me know what you want to do about the PCB.
>
> Please let me know the exact passives modifications. I will purchase the
> components asap and send the modifications list to the fab.
>
> Best regards.
>
> Jean-Samuel.
> :-)
>
> Le 23 juil. 2012 22:47, "Andrey Sviyazov" <andreysviyaz@gmail.com> a écrit :
>
>> Hi Jean-Samuel.
>>
>> Please let me know fabrication progress, a specially PCB.
>> I ask you because of few changes required to improve LMS phase noises.
>> BOM required changes in passive components only.
>> If PCB doesn't yet ordered, then possible I'll make changes too.
>>
>> Best regards,
>> Andrey Sviyazov.
>> (Sent from my mobile client)
>>
>> 04.07.2012 20:01 пользователь "Jean-Samuel Najnudel - BJT PARTNERS SARL"
>> <jsn@bjtpartners.com> написал:
>>>
>>> Hi Andrey,
>>>
>>> Thank you very much for your help.
>>>
>>> I will forward this to the fab.
>>> Yes, you are all right, the FBMH2012HM121-T price is much better than the
>>> MLB-201209-0120PU. However, availability on Farnell France is not as good as
>>> the MLB-201209-0120PU. Price difference is quite big but we only use 5 beads
>>> per boards. Difference makes only about 1 euro per board. I will let the fab
>>> decide between these 2 references.
>>>
>>> Best regards.
>>>
>>> Jean-Samuel.
>>> :-)
>>>
>>>
>>> On Wed, Jul 4, 2012 at 4:30 PM, Andrey Sviyazov <andreysviyaz@gmail.com>
>>> wrote:
>>>>
>>>> Hi Jean-Samuel.
>>>>
>>>> Yes, you are all right and you can order TDK - MPZ1608S601A instead of
>>>> MLB-160808-0600PL.
>>>> And also possible to use 3 times cheaper FBMH2012HM121-T, 0805, 2.5A
>>>> instead of MLB-201209-0120PU.
>>>>
>>>> Best regards,
>>>> Andrey Sviyazov.
>>>>
>>>>
>>>>
>>>> 2012/7/4 Jean-Samuel Najnudel - BJT PARTNERS SARL <jsn@bjtpartners.com>
>>>>>
>>>>> Hi Andrey,
>>>>>
>>>>> Thank you very much for your reply.
>>>>> Now, I better understand.
>>>>>
>>>>> You are all right. I do not have anything as high current as
>>>>> MLB-201209-0120PU at a lower price.
>>>>>
>>>>> However, I have a 0603 600 ohm 1A bead, as MLB-160808-0600PL, at a much
>>>>> lower price.
>>>>>
>>>>> http://ru.farnell.com/tdk/mpz1608s601a/ferrite-bead-0603-600-ohm/dp/1669747RL
>>>>> What do you think about this component (TDK MPZ1608S601A)?
>>>>>
>>>>> Best regards.
>>>>>
>>>>> Jean-Samuel.
>>>>> :-)
>>>>>
>>>>>
>>>>>
>>>>> On Wed, Jul 4, 2012 at 3:22 PM, Andrey Sviyazov
>>>>> <andreysviyaz@gmail.com> wrote:
>>>>>>
>>>>>> Hi Jean-Samuel.
>>>>>>
>>>>>> If Farnell better for you, then please order exactly MLB-201209-0120PU
>>>>>> and MLB-160808-0600PL.
>>>>>> They are HI_CURRENT beads and it is really required.
>>>>>>
>>>>>> Please find attached here new SCH and BOM files with new part numbers
>>>>>> and links.
>>>>>>
>>>>>> Best regards,
>>>>>> Andrey Sviyazov.
>>>>>>
>>>>>>
>>>>>>
>>>>>> 2012/7/4 Jean-Samuel Najnudel - BJT PARTNERS SARL
>>>>>> <jsn@bjtpartners.com>
>>>>>>>
>>>>>>> Hi Andrey,
>>>>>>>
>>>>>>> Thank you very much for your reply.
>>>>>>>
>>>>>>> Could you please confirm the components bellow are fine ?
>>>>>>>
>>>>>>> http://fr.farnell.com/murata/blm18tg601tn1d/ferrite-600ohm/dp/1115050RL
>>>>>>>
>>>>>>> http://fr.farnell.com/tdk/mmz2012121b/perle-de-ferrite-0805-120-ohm/dp/1669728RL
>>>>>>>
>>>>>>> Please let me know if this is fine.
>>>>>>> If not, which would you suggest ?
>>>>>>> http://ru.farnell.com/ferrite-beads
>>>>>>>
>>>>>>>
>>>>>>> Thanks a lot for your help.
>>>>>>>
>>>>>>> Best regards.
>>>>>>>
>>>>>>> Jean-Samuel.
>>>>>>> :-)
>>>>>>>
>>>>>>>
>>>>>>> On Wed, Jul 4, 2012 at 2:02 PM, Andrey Sviyazov
>>>>>>> <andreysviyaz@gmail.com> wrote:
>>>>>>>>
>>>>>>>> Hi Jean-Samuel.
>>>>>>>>
>>>>>>>> For the TI160808U601 and TI201209U121 you can use any high current
>>>>>>>> ferrite chip bead with 600 Ohm and 120 Ohm impedance respectively.
>>>>>>>> For example you could order similar partnumbers from the ELFA
>>>>>>>> catalogue in the 0603 and 0805 SMD cases respectively, datasheet here pdf.
>>>>>>>>
>>>>>>>> Best regards,
>>>>>>>> Andrey Sviyazov.
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> 2012/7/4 Jean-Samuel Najnudel - BJT PARTNERS SARL
>>>>>>>> <jsn@bjtpartners.com>
>>>>>>>>>
>>>>>>>>> Hi Andrey,
>>>>>>>>>
>>>>>>>>> Thank you very much for your reply.
>>>>>>>>>
>>>>>>>>> I try to find where to buy the TI160808U601 and TI201209-121
>>>>>>>>> chokes. I do not know where I should find these. Would you know where I
>>>>>>>>> should order these components ?
>>>>>>>>>
>>>>>>>>> By the way, do you confirm the ISSI SRAM is pin compatible with the
>>>>>>>>> Cypress chip ?
>>>>>>>>>
>>>>>>>>> http://www.digikey.com/product-detail/en/IS61NLP51236-200TQLI/706-1103-ND/1557418
>>>>>>>>>
>>>>>>>>> Is this ISSI chip fine for our application ? Is 18 MBit enough ?
>>>>>>>>> Do you confirm this ISSI chip is the best value for what we need ?
>>>>>>>>> Are you sure we cannot find a lower cost chip with similar performances
>>>>>>>>> and/or a better performances chip with similar cost ?
>>>>>>>>> Are you sure we will not need to reroute the PCB ?
>>>>>>>>>
>>>>>>>>> We really need to be sure before starting the PCB production. If
>>>>>>>>> both you and Alexander confirm everything is fine, I will ask the fab to
>>>>>>>>> start the PCB.
>>>>>>>>>
>>>>>>>>> Please let me know.
>>>>>>>>>
>>>>>>>>> Again, thanks a lot for your help.
>>>>>>>>>
>>>>>>>>> Best regards.
>>>>>>>>>
>>>>>>>>> Jean-Samuel.
>>>>>>>>> :-)
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On Tue, Jul 3, 2012 at 11:40 PM, Andrey Sviyazov
>>>>>>>>> <andreysviyaz@gmail.com> wrote:
>>>>>>>>>>
>>>>>>>>>> Jean-Samuel.
>>>>>>>>>>
>>>>>>>>>> Please inform me what actually rf chockes partnumbers are problem
>>>>>>>>>> to order.
>>>>>>>>>> Unfortunately MuRata produce few billion pcs and then stopped for
>>>>>>>>>> a few years.
>>>>>>>>>> So, possible we have to find some Chinese fab partnumbers to
>>>>>>>>>> order.
>>>>>>>>>>
>>>>>>>>>> Best regards,
>>>>>>>>>> Andrey Sviyazov.
>>>>>>>>>> (Sent from my mobile client)
>>>>>>>>>>
>>>>>>>>>> 04.07.2012 1:22 пользователь "Andrey Sviyazov"
>>>>>>>>>> <andreysviyaz@gmail.com> написал:
>>>>>>>>>>
>>>>>>>>>>> Hi Jean-Samuel.
>>>>>>>>>>> Unfortunately I have no internet connection now.
>>>>>>>>>>> Tomorrow I'll check flash and others.
>>>>>>>>>>>
>>>>>>>>>>> Best regards,
>>>>>>>>>>> Andrey Sviyazov.
>>>>>>>>>>> (Sent from my mobile client)
>>>>>>>>>>>
>>>>>>>>>>> 04.07.2012 1:10 пользователь "Alexander Chemeris"
>>>>>>>>>>> <alexander.chemeris@gmail.com> написал:
>>>>>>>>>>> >
>>>>>>>>>>> > On Mon, Jul 2, 2012 at 10:16 PM, Jean-Samuel Najnudel - BJT
>>>>>>>>>>> > PARTNERS
>>>>>>>>>>> > SARL <jsn@bjtpartners.com> wrote:
>>>>>>>>>>> > > 1/ Would you know a distributor for the Murata chokes ? The
>>>>>>>>>>> > > fab them to have
>>>>>>>>>>> > > some issue to source these.
>>>>>>>>>>> >
>>>>>>>>>>> > Andrey is looking into this.
>>>>>>>>>>> >
>>>>>>>>>>> > > 2/ Would you suggest a distributor for the GPS chip ?
>>>>>>>>>>> >
>>>>>>>>>>> > Try contacting manufacturer directly:
>>>>>>>>>>> >
>>>>>>>>>>> > http://www.transystem.com.tw/product.php?b=g&m=pe&cid=4&sid=&id=66
>>>>>>>>>>> >
>>>>>>>>>>> > They have a distributor in UK, but I think it might be easier
>>>>>>>>>>> > to buy
>>>>>>>>>>> > from the manufacturer directly:
>>>>>>>>>>> > http://www.castlemicrowave.com/castle-contact.asp
>>>>>>>>>>> >
>>>>>>>>>>> > This chip is popular in Russia, so it is easy to source them
>>>>>>>>>>> > here,
>>>>>>>>>>> > shipping them to EU might be a pain in big batches, but I think
>>>>>>>>>>> > we
>>>>>>>>>>> > could send few chips for this prototyping batch if
>>>>>>>>>>> > manufacturer's lead
>>>>>>>>>>> > time is too long. Here it costs $14.50/chip for more then 16
>>>>>>>>>>> > chips:
>>>>>>>>>>> > http://www.compel.ru/infosheet/TSI/EB-570/
>>>>>>>>>>> >
>>>>>>>>>>> > --
>>>>>>>>>>> > Regards,
>>>>>>>>>>> > Alexander Chemeris.
>>>>>>>>>>> > CEO, Fairwaves LLC / ООО УмРадио
>>>>>>>>>>> > http://fairwaves.ru
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>

--
Regards,
Alexander Chemeris.
CEO, Fairwaves LLC / ООО УмРадио
http://fairwaves.ru