Hi
> On Oct 10, 2016, at 7:06 AM, Chris Albertson <[email protected]> > wrote: > > Let's back up, start over. I want to use an SDR-like thing to > characterize my new 10MHz oscillator, or actually to compare it to my > Thunderbolt > What are the steps? The test document on an OCXO or a GPSDO runs into several dozen to several hundred pages. It also sub-references multiple documents of similar size. All that gets only just so deep. The assumption is that routine maintenance and calibration have taken care of a lot of other things. You do *not* want to dig into all that :) > > Then after we list the steps I want to see why so many samples are required The original paper did a direct sample of the signal. Nyquist gets you into the > 20 mega sample range. > > Or maybe a better way to ask is "How will the results be limited if I > can only sample at 2.3 MSPS? They use the dual ADC simultaneous sample process to reduce the jitter of the sample. It’s in the paper. > > Obviously I'n not directly sampling there 10MHz signal. I'm sampling > there frequency difference that a mixer gives me. Then build a DMTD with a stable / low noise reference rather than the poor stability reference in a SDR dongle. Again, no free lunch :) Bob > > > On Sun, Oct 9, 2016 at 4:16 PM, Bob Camp <[email protected]> wrote: >> Hi >> >> >>> On Oct 9, 2016, at 6:18 PM, Chris Albertson <[email protected]> >>> wrote: >>> >>> Likely the lowest cost way to get into that is with a TV tuner USB >>> dongle. They cost about $20. People are able to get about 2.4 mega >>> samples per second. >> >> Except that you need about 30 mega samples ... > -- > > Chris Albertson > Redondo Beach, California > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
