Hi Alexander,

Thank you very much for your reply and detailled explainations. Now I understand.

My point of view is we do not really care of a few watts power consumption saving for the lab version. At worst, we can still add a fan in the lab enclosure, as for the USRP which also dissipate up to about 15 Watts. On the other side, it makes a lot of sense to save some power consumption for the industrial version as, on the field, every watt counts and we also need to dissipate the heat without fan for better reliability.

Considering this, I believe as follow. Either we are able to decrease the power consumption and keep good enough performances for industrial applications. In this case, we should make this modification for both lab and industrial versions. Either decreasing the power consumption will decrease the performances. In this case, I do not think this worth making this modification at all. In both cases, I would suggest we keep the same design for both lab and industrial versions, either with or without the modification.

Moreover, if both lab and industrial versions are the same, except connectors may be, debug from lab users may help industrial users and debug from industrial users may help lab users. This would be really easier to get a reliable single board for both lab and industrial applications.

Best regards.

Jean-Samuel. :-)

On Wed, Oct 31, 2012 at 7:30 PM, Alexander Chemeris < alexander.chemeris@gmail.com> wrote:

On Wed, Oct 31, 2012 at 10:23 PM, Jean-Samuel Najnudel - BJT PARTNERS SARL jsn@bjtpartners.com wrote:

...

Why skip/populate LMS power supply block ? As I understand we always need the LMS power supply block. I probably

missed

...

something. Could you explain this in more details to let me better understand ?

If I understand correctly, this is the modification which Andrey is testing - avoid additional power conversion near LMS. We may need it for better performance for industrial version, but we most likely do not need it for the lab version.

Decreasing power consumption to 10-11W would allow us to use lighter enclosure for the lab version, which is nice.

PS I'd love to move this discussion to the public UmTRX mailing list. Is it fine with you? Actually, if you feel fine, you could start such discussion at the public UmTRX mailing list from the beginning.

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