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Alexander Chemeris Alexander.Chemeris at fairwaves.ruOn Tue, Jul 24, 2012 at 12:25 AM, Alexander Chemeris <Alexander.Chemeris at fairwaves.ru> wrote: > Hi Andrey, > > On Mon, Jul 23, 2012 at 10:44 PM, Andrey Sviyazov > <andrey.sviyazov at 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 http://fairwaves.ru