Sorry for my crooked hands :) Final project files and cheapest BOM for debug variant included here.

Best regards, Andrey Sviyazov.

2012/6/5 Andrey Sviyazov andreysviyaz@gmail.com

Here included project files and cheapest BOM for debug variant.

Best regards, Andrey Sviyazov.

2012/6/5 Andrey Sviyazov andreysviyaz@gmail.com

...

Hi all!

Here last version PCB of UmTRXv2. In the next e-mail I'll include project files and cheapest BOM for debug variant. I think it is final, because of nobody desire to say me any suggestions (except Robin).

Best regards, Andrey Sviyazov.

Hi Jean-Samuel.

I decide to add SMD LED's to the project just to have cheap variant but for debug only. I am glade that this variant will be useful for you.

Best regards, Andrey Sviyazov. (Sent from my mobile client) 06.06.2012 0:54 пользователь "Jean-Samuel Najnudel - BJT PARTNERS SARL" < jsn@bjtpartners.com> написал:

Hi Andrey,

Thank you very much for these files. Thanks a lot for this great work. Just a question, what do you mean by "cheapest BOM for debug variant" ?

Best regards.

Jean-Samuel. :-)

On Tue, Jun 5, 2012 at 11:44 PM, Andrey Sviyazov andreysviyaz@gmail.comwrote:

...

Sorry for my crooked hands :) Final project files and cheapest BOM for debug variant included here.

Best regards, Andrey Sviyazov.

2012/6/5 Andrey Sviyazov andreysviyaz@gmail.com

...

Here included project files and cheapest BOM for debug variant.

Best regards, Andrey Sviyazov.

2012/6/5 Andrey Sviyazov andreysviyaz@gmail.com

...

Hi all!

Here last version PCB of UmTRXv2. In the next e-mail I'll include project files and cheapest BOM for debug variant. I think it is final, because of nobody desire to say me any suggestions (except Robin).

Best regards, Andrey Sviyazov.

Here PcbDoc @ 10/06/2012.

Best regards, Andrey Sviyazov.

2012/6/10 Andrey Sviyazov andreysviyaz@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.

Hi Jean-Samuel.

I'll try to generate Gerber files this night and then send them to you after double check.

Best regards, Andrey Sviyazov. (Sent from my mobile client) 11.06.2012 2:15 пользователь "Jean-Samuel Najnudel - BJT PARTNERS SARL" < jsn@bjtpartners.com> написал:

Hi Andrey,

Thank you very much for the project documents.

Thanks a lot for the changes. I really think SMD LEDs at PCB front edge can be an effective, convenient and cheap solution.

Anyway, these project files looks fine for me. If everybody can double check and confirm everything is ok, please generate all the files we need. I will send these to the fab and start to move forward to the prototype production process with them.

Really, thanks a lot for this work. I am really glad we can move forward to production. This is really great.

Best regards.

Jean-Samuel. :-)

On Sun, Jun 10, 2012 at 2:46 AM, Andrey Sviyazov andreysviyaz@gmail.comwrote:

...

Here PcbDoc @ 10/06/2012.

Best regards, Andrey Sviyazov.

2012/6/10 Andrey Sviyazov andreysviyaz@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.

Here PcbDoc file @ 12/06/2012 . So, it all done :)

Best regards, Andrey Sviyazov.

2012/6/12 Andrey Sviyazov andreysviyaz@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@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.

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@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@gmail.com написал:

Here PcbDoc file @ 12/06/2012 .

...

So, it all done :)

Best regards, Andrey Sviyazov.

2012/6/12 Andrey Sviyazov andreysviyaz@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@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.

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@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@gmail.comwrote:

...

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@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@gmail.com написал:

Here PcbDoc file @ 12/06/2012 .

...

So, it all done :)

Best regards, Andrey Sviyazov.

2012/6/12 Andrey Sviyazov andreysviyaz@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@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.

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@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@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@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@gmail.comwrote:

...

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@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@gmail.com написал:

Here PcbDoc file @ 12/06/2012 .

...

So, it all done :)

Best regards, Andrey Sviyazov.

2012/6/12 Andrey Sviyazov andreysviyaz@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@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. >> > >

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@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@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@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@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@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@gmail.comwrote:

...

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@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@gmail.com > написал: > > Here PcbDoc file @ 12/06/2012 . >> So, it all done :) >> >> Best regards, >> Andrey Sviyazov. >> >> >> >> 2012/6/12 Andrey Sviyazov andreysviyaz@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@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. >>>> >>> >>> >>

Hi Jean-Samuel,

On Tue, Jul 3, 2012 at 10:59 PM, Jean-Samuel Najnudel - BJT PARTNERS SARL jsn@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.

We really need to get prototypes ASAP for many reasons - we have to start certification process, we still need to find enclosures, we have other pilots pending, etc. And every week of delay is painful for us.

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.

We should be fine with this chip: http://www.digikey.com/product-detail/en/IS61NLP51236-200TQLI/706-1103-ND/15... (with no PCB changes).

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.

We have only 5 FPGAs left, so I think we should assembly 5 prototypes. I.e. we need 10 LMS chips.

But we could safely order more PCBs, because we're pretty sure PCB won't change.

By the way, the meeting with the fab this morning was fine and they are ready to start the production asap.

Please, start PCB manufacturing ASAP.

On Wed, Jul 4, 2012 at 12:36 AM, Jean-Samuel Najnudel - BJT PARTNERS SARL jsn@bjtpartners.com wrote:

Hi Alexander,

On 7/3/12, Alexander Chemeris alexander.chemeris@gmail.com wrote:

...

Hi Jean-Samuel,

We should be fine with this chip: http://www.digikey.com/product-detail/en/IS61NLP51236-200TQLI/706-1103-ND/15... (with no PCB changes).

This looks good. However, this SRAM is 18 MBits instead of 36 MBits. This makes a quite big difference. Are you sure this will be fine ? Andrey, do you confirm this is fine ? Is this chip fully pin compatible ?

18Mbit is fine, but I was wrong with the pin compatibility. Now looking at other options.

On Wed, Jul 4, 2012 at 12:36 AM, Jean-Samuel Najnudel - BJT PARTNERS SARL jsn@bjtpartners.com wrote:

...

But we could safely order more PCBs, because we're pretty sure PCB won't change.

Yes, for sure I will. You are completly right. I asked for the price. There is only about 100 Euros difference in total between 5 and 20 PCB. Moreover, ordering 20 PCB will save us a lot on next batches. It will also save us a lot of valuable time if we need some more prototypes. Actually, the PCB is what makes the production quite long.

Sounds great. 20 PCBs should be enough for now.

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=&...

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

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/15...

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.comwrote:

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=&...

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

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/16697...

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.comwrote:

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 ELFAhttps://www.elfa.se/elfa3%7Eeu_en/elfa/init.do?init=1&shop=ELFA_EU-ENcatalogue in the 0603https://www.elfa.se/elfa3%7Eeu_en/elfa/init.do?item=65-500-37&toc=20387and 0805 https://www.elfa.se/elfa3%7Eeu_en/elfa/init.do?item=65-500-43&toc=0 SMD cases respectively, datasheet here pdfhttps://www1.elfa.se/data1/wwwroot/assets/datasheets/jqMLB-HighCurrent_e.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/15...

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.comwrote:

...

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=&...

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

Hi all.

Here package of the project and schdoc. PcbDoc still doesn't changed.

Best regards, Andrey Sviyazov.

2012/7/4 Andrey Sviyazov andreysviyaz@gmail.com

Hi Jean-Samuel.

If Farnell better for you, then please order exactly MLB-201209-0120PUhttp://ru.farnell.com/mec-marcom/mlb-201209-0120pu/ferrite-bead-0805-case-120ohm-5a/dp/1308778RL and MLB-160808-0600PLhttp://ru.farnell.com/mec-marcom/mlb-160808-0600pl/ferrite-bead-0603-case-600ohm-1a/dp/1308770RL . 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/16697...

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.comwrote:

...

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 ELFAhttps://www.elfa.se/elfa3%7Eeu_en/elfa/init.do?init=1&shop=ELFA_EU-ENcatalogue in the 0603https://www.elfa.se/elfa3%7Eeu_en/elfa/init.do?item=65-500-37&toc=20387and 0805https://www.elfa.se/elfa3%7Eeu_en/elfa/init.do?item=65-500-43&toc=0 SMD cases respectively, datasheet here pdfhttps://www1.elfa.se/data1/wwwroot/assets/datasheets/jqMLB-HighCurrent_e.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/15...

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=&... > > 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

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, 2.5Ahttp://ru.farnell.com/taiyo-yuden/fbmh2012hm121-t/ferrite-bead-0805-32mohm-2-5a/dp/8186421 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/1669747R... 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.comwrote:

...

Hi Jean-Samuel.

If Farnell better for you, then please order exactly MLB-201209-0120PUhttp://ru.farnell.com/mec-marcom/mlb-201209-0120pu/ferrite-bead-0805-case-120ohm-5a/dp/1308778RL and MLB-160808-0600PLhttp://ru.farnell.com/mec-marcom/mlb-160808-0600pl/ferrite-bead-0603-case-600ohm-1a/dp/1308770RL . 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/16697...

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.comwrote:

...

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 ELFAhttps://www.elfa.se/elfa3%7Eeu_en/elfa/init.do?init=1&shop=ELFA_EU-ENcatalogue in the 0603https://www.elfa.se/elfa3%7Eeu_en/elfa/init.do?item=65-500-37&toc=20387and 0805https://www.elfa.se/elfa3%7Eeu_en/elfa/init.do?item=65-500-43&toc=0 SMD cases respectively, datasheet here pdfhttps://www1.elfa.se/data1/wwwroot/assets/datasheets/jqMLB-HighCurrent_e.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/15...

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=&... > > > > 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 >

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.comwrote:

...

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, 2.5Ahttp://ru.farnell.com/taiyo-yuden/fbmh2012hm121-t/ferrite-bead-0805-32mohm-2-5a/dp/8186421 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/1669747R... 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.comwrote:

...

Hi Jean-Samuel.

If Farnell better for you, then please order exactly MLB-201209-0120PUhttp://ru.farnell.com/mec-marcom/mlb-201209-0120pu/ferrite-bead-0805-case-120ohm-5a/dp/1308778RL and MLB-160808-0600PLhttp://ru.farnell.com/mec-marcom/mlb-160808-0600pl/ferrite-bead-0603-case-600ohm-1a/dp/1308770RL . 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/16697...

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 ELFAhttps://www.elfa.se/elfa3%7Eeu_en/elfa/init.do?init=1&shop=ELFA_EU-ENcatalogue in the 0603https://www.elfa.se/elfa3%7Eeu_en/elfa/init.do?item=65-500-37&toc=20387and 0805https://www.elfa.se/elfa3%7Eeu_en/elfa/init.do?item=65-500-43&toc=0 SMD cases respectively, datasheet here pdfhttps://www1.elfa.se/data1/wwwroot/assets/datasheets/jqMLB-HighCurrent_e.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/15... > > 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=&... >>> > >>> > 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 >>> >> >

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/2008...

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/1669747R... 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/16697... > > 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/15... >>> >>> 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=&... >>>>> > >>>>> > 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 >>> >>> >> >

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/2008...

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/1669747R...

...

...

...

...

> 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/16697...

...

...

...

...

>>> >>> 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/15...

...

...

...

...

>>>>> >>>>> 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=&...

...

...

...

...

>>>>>>> > >>>>>>> > 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

Andrey, thanks. Please send me UmTRXv2_sch_all.pdf as well

On Mon, Jul 30, 2012 at 4:22 PM, Andrey Sviyazov andreysviyaz@gmail.com wrote:

Here project, sch and pcb files.

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/2008...

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/1669747R... >>> 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/16697... >>>>> >>>>> 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/15... >>>>>>> >>>>>>> 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=&... >>>>>>>>> > >>>>>>>>> > 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

Hi Andrey,

Thank you for your reply.

The problem is the chip beads you suggest are quite expensive. You can see this on Farnell. As there are 60 of these beads on the board, even a few cents make a difference. Could you suggest cheaper references ? Thanks a lot for your help.

Best regards.

Jean-Samuel. :-)

On Wed, Jul 4, 2012 at 2:23 PM, Andrey Sviyazov andreysviyaz@gmail.comwrote:

Hi Jean-Samuel.

About SRAM which I've found from ISSI I'm sure that it full compatible and of cause we are discussed with Andrew Karpenkov and Alexander Chemeris that 18Mbit size should be enough. And also I think you should order exactly this 0603 and 0805 chip beads instead of TI160808U601 and TI201209U121 as I mentioned and do not spend time for search.

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/15...

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.comwrote:

...

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=&...

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

Jean-Samuel,

I sent you the link to Compel just for the reference, to give you an idea of price. As I mentioned, I recommend you to contact manufacturer directly.

On Wed, Jul 4, 2012 at 11:24 AM, Jean-Samuel Najnudel - BJT PARTNERS SARL jsn@bjtpartners.com wrote:

Hi Alexander,

Thank you very much for your advice. Price looks fine but Compel.ru web site is all in Russian. It is not very easy for me to order. Would you know another online store that would have English order web pages ?

Thanks a lot for your help.

Best regards.

Jean-Samuel. :-)

On Tue, Jul 3, 2012 at 11:10 PM, Alexander Chemeris alexander.chemeris@gmail.com wrote:

...

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=&...

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