23 Jul
2012
23 Jul
'12
10:25 p.m.
Hi Andrey,
On Mon, Jul 23, 2012 at 10:44 PM, Andrey Sviyazov andrey.sviyazov@fairwaves.ru wrote:
Today I found why noises and spurs are really happens in UmTRXv1.
Finally, we could say UmTRX is good at phase noise.
- Only full disabling (no power) GPS module can kill all near spurs.
I wonder whether EB-570 is any better. And if EB-570 is no better - how could we protect LMS from this noise?
- To get good noises the next changes are required:
- replace choke L6 by capacitor 10nF..0.1uF.
- remove C45.
Is it possible to apply those changes for UmTRXv2 without PCB changes?
-- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru