Yes, I have taken a look and the FSUP is 1MHz min at the signal analyzer. Timepod? No, 500KHz min... an R&S FAM modulation analyzer?
On Wed, Dec 5, 2012 at 10:48 PM, Bob Camp <li...@rtty.us> wrote: > Hi > > A "3048" style measurement with the carrier suppressed by lock should do > pretty well. If the XOR's are out, there are a lot of mixers available that > work at 125 KHz. A simple op-amp buffer and a sound card could do what you > need to do. > > Bob > > -----Original Message----- > From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On > Behalf Of Adrian > Sent: Wednesday, December 05, 2012 4:33 PM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] Very challenging phase noise measurement, does > anyone have an idea?? > > For phase noise the frequency range is 1MHz to 8/26.5/50GHz > The spectrum analyzer works from 20Hz to max. > > Adrian > > > Azelio Boriani schrieb: > > Isn't the FSUP a 110K euros equipment 20Hz-50GHz capable? 125KHz > shouldn't > > be a problem. I had an FSUP for 25 seconds to play with... really > > impressive but too limited test time to appreciate fully. > > > > On Wed, Dec 5, 2012 at 1:14 PM, Bob Camp <li...@rtty.us> wrote: > > > >> Hi > >> > >> Just about any of the high speed CMOS parts should work. A 74AC86 is > about > >> the earliest part I would trust. Any of the fast logic families that > came > >> after that should do equally well. > >> > >> Bob > >> > >> On Dec 5, 2012, at 7:03 AM, Hans Rosenberg <hrosenb...@catena.nl> > wrote: > >> > >>> Hello Time-nuts, > >>> > >>> I have to do a phase noise measurement and I'm wondering if anyone here > >> has any ideas on that. We have to measure the phase noise of a 125kHz > >> carrier (5Vp-p signal level). The measurement system should have a noise > >> floor that is -164dBc/Hz at a distance of 1kHz to 8kHz away from the > >> carrier. > >>> Our current plan is to use 2 of these sources, have one in free running > >> mode and lock the other one to the first one using an XOR gate and then > use > >> the output of the XOR gate as an output signal. However, we are > wondering > >> if any of you know a better idea. Maybe there is an off-the-shelf piece > of > >> equipment that can do that that we could rent. Or maybe we could > increase > >> the frequency to a few megahertz using a pll, which means the signal > comes > >> into the measurement range of our FSUP phase-noise analyzer. Problem is, > >> the phase detector would then need to have an insanely low noise-floor > (in > >> our idea the XOR also has to have this insanely low noise floor as well > off > >> course) so does anyone have experience with anything like this? Does > anyone > >> know an XOR with these good specs? I don't have a clue what a standard > >> 74lvc1g86 would do. Needless to say the supply of this XOR would have to > be > >> ridiculously clean, but I do have a solution for that problem. > >>> Any help is greatly appreciated! > >>> > >>> Best regards, > >>> > >>> Hans Rosenberg > >>> _______________________________________________ > >>> time-nuts mailing list -- time-nuts@febo.com > >>> To unsubscribe, go to > >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >>> and follow the instructions there. > >> > >> _______________________________________________ > >> time-nuts mailing list -- time-nuts@febo.com > >> To unsubscribe, go to > >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >> and follow the instructions there. > >> > > _______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.