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Thomas Tsou thomastsou at gmail.comHi Andrey, On Thu, Jul 19, 2012 at 10:10 AM, Andrey Sviyazov <andrey.sviyazov at fairwaves.ru> wrote: > Hi all. > > I've found spurs on the LO noise plot at ~33kHz and ~66kHz offset when GPS > antenna used and position locked. > This spurs begin grow up when GPS just near to lock position and after > locking spurs stopped to grow as you can see at picture. > If thereafter GPS disconnected then noise coming back to normal plot. > I think that it is result of 32768Hz clock in the GPS module EB-230, but > can't understant how it can impact to 26MHz clock or VCO. > Please tell me something who know. > > Thomas. > Was GPS antenna connected when noise measured like on the picture which you > sent us (also attached here)? > I would to know because of anomal peak near to 30kHz offset too. I have not connected a GPS antenna for any of the tests. I will run some measurements with register 0x16 later today. Thomas