Joseph M Gwinn wrote: > Rex, > > > [email protected] wrote on 08/04/2009 07:35:51 PM: > > >> From: >> >> Rex <[email protected]> >> >> To: >> >> Discussion of precise time and frequency measurement >> > <[email protected]> > >> Date: >> >> 08/04/2009 07:43 PM >> >> Subject: >> >> Re: [time-nuts] Method for comparing oscillators >> >> Sent by: >> >> [email protected] >> >> Bruce Griffiths wrote: >> >> >>> Rex wrote: >>> >>> >>> >>>> Poul-Henning Kamp wrote: >>>> >>>> >>>> >>>> >>>>> In message >>>>> <[email protected]>, John >>>>> Green writes: >>>>> >>>>>> I have studied the dual mixer approach and the consensus is that it >>>>>> is the >>>>>> most accurate method. However, it seems pretty difficult to >>>>>> >> obtain that >> >>>>>> accuracy. >>>>>> >>>>> Check the description and papers about Timing.com's way of doing it, >>>>> they >>>>> are quite clever. >>>>> >>>>> >>>>> >>>> Poul-Henning, >>>> >>>> Can you give a more specific reference to the documentation? I took a >>>> look around www.symmetricom.com/resources/ (where timing.com >>>> redirects) but it is not clear to me that anything I found describes >>>> their way of doing it. >>>> >>>> >>>> >>> Rex >>> >>> Look at the TSC5115A and the TSC5120A (download and read the manuals) >>> plus the associated patents. >>> >>> Bruce >>> >>> >> Bruce, >> >> Thanks, that looks interesting. I found the manual here... >> http://www.symmetricom.com/media/files/support/ttm/product- >> manual/5120A-MAN.pdf >> >> But I haven't figured out where to get a list of related patents. Can >> anyone provide key number(s) or point me to a list? >> > > I dug this up a year or two ago. It was not easy to find, but the main > patent is US Patent 7,227,346 to Solbrig. The patent text may be obtained > from www.pat2pdf.org or Google Patents. > > There may be another patent, but I don't know its number. > > The main article was "Direct-Digital Phase-Noise Measurement", J. Grove, > J. Hein, J. Retta, P. Schweiger, W. Solbrig, and S.R. Stein, 2004 IEEE > International Ultrasonics, Ferroelectrics, and Frequency Control Joint > 50th Anniversary Conference, pages 287-291, > 0-7803-8414-8/04/$20.00 (c)2004 IEEE. Much of the text of this article > also appears in an appendix to the 5120 manual. > > Joe Gwinn > > Joe
7436166 is the other relevant patent. Bruce _______________________________________________ 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.
