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Alexander Chemeris alexander.chemeris at gmail.comHi Andrey, Could you also describe to Thomas and Sylvain what to do with C45 and L6? I guess that's a required step before they do any other measurements. And please, add this issue to the issue tracker. On Wed, Jul 25, 2012 at 1:56 AM, Andrey Sviyazov <andrey.sviyazov at fairwaves.ru> wrote: > Hi Thomas. > > Could you please make test again for LO integral phase noise and modulation > accuracy with PLL loop filter 100kHz and ICP=0.4mA (or above), as Srdjan > suggested us. > I've assembled 100kHz loop filter with the next components: > C82 = 100pF, C83=1500pF, C84=33pF, R106=2.2k, R109=3.3k. > To get good noises replace choke L6 by capacitor 10nF..22nF and remove C45. > > I ask you because I have to send final BOM as soon as possible to avoid > delay of UmTRXv2 production due to changes for improvements. > > Best regards, > Andrey Sviyazov. > P.S. Pictures attached just to be sure. > > > 2012/7/23 Andrey Sviyazov <andrey.sviyazov at fairwaves.ru> >> >> >> > > Perhaps this is a silly question, but how do I calibrate the clock? or >> > > use an external reference signal? >> > >> > Andrey Sviyazov - does ClockIn works as external input in UmTRXv1? >> >> Yes, 5V cmos level required or smaller with DC offset to get 2.5V >> symmetry. >> Turn switches to MHz and slave positions. >> >> Best regards, >> Andrey Sviyazov. >> (Sent from my mobile client) > > -- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru