This is merely a historical archive of years 2008-2021, before the migration to mailman3.
A maintained and still updated list archive can be found at https://lists.osmocom.org/hyperkitty/list/UmTRX@lists.osmocom.org/.
Andrey Sviyazov andrey.sviyazov at fairwaves.ruHi 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) > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/umtrx/attachments/20120725/823dfed2/attachment.htm> -------------- next part -------------- A non-text attachment was scrubbed... Name: Clock AC coupling and 100 kHz.png Type: image/png Size: 110842 bytes Desc: not available URL: <http://lists.osmocom.org/pipermail/umtrx/attachments/20120725/823dfed2/attachment.png> -------------- next part -------------- A non-text attachment was scrubbed... Name: PLL 100kHz BW_bottom side.png Type: image/png Size: 118649 bytes Desc: not available URL: <http://lists.osmocom.org/pipermail/umtrx/attachments/20120725/823dfed2/attachment-0001.png>