On Tue, Jul 24, 2012 at 12:25 AM, Alexander Chemeris
<Alexander.Chemeris(a)fairwaves.ru> wrote:
Hi Andrey,
On Mon, Jul 23, 2012 at 10:44 PM, Andrey Sviyazov
<andrey.sviyazov(a)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.
1) 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?
2) 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?
PS Please add both points to the tracker, so we don't forget.
--
Regards,
Alexander Chemeris.
CEO, Fairwaves LLC / ООО УмРадио