Paul, if you set the serial switch on the LTE-Lite over to the NMEA side then the uBlox application will give you all sorts of bar graphs for signal strengths, position, time, etc as it decodes all the NMEA messages. Alex, the TSC5125A user manual contains a description of the theory in its Appendix B. Its probably available on the Microsemi website as I don't think its confidential. Also, I think John's TimePod user manual probably has a description of it. Otherwise I remember Sam Stein (who is behind the TSC units) had some PTTI or similar presentations discussing the technology, but I don't know where those could be downloaded. Bye, Said In a message dated 11/20/2014 14:34:32 Pacific Standard Time, a...@pcscons.com writes:
Hi Said, do you have any information about how that "TimePod 5330A works" any principal description? 73 KJ6UHN Alex On 11/20/2014 2:08 PM, S. Jackson via time-nuts wrote: > Hello Mike, > > attached is a 10MHz DIP-14 TCXO Phase Noise plot from a random LTE-Lite > unit. > > I had sent out a 20MHz typical phase noise plot some weeks ago, and > comparing the two they are almost perfectly 6dB apart as would be expected from > the 20log(n/m) relationship. There are variations from unit to unit of > course, but it does not seem like one version of the board or the other has > advantages in terms of phase noise. > > I had also sent out a superimposed plot of the 20MHz and the divide-by-2 > 10MHz output of the same board at that time, and again the relationship was > almost perfectly 6dB lower at 10MHz versus 20MHz. > > While phase noise follows theory, it does seem that the DIP14 metal shield > has a beneficial effect on the ADEV stability though. The plots we are > getting are pretty darn good, and I want to test more boards before I post any > ADEV, because its quite a bit better than our specification and I want to > make sure its real. > > The 10MHz DIP-14 boards do not have an isolating buffer like the 20MHz > boards do, on these the TCXO drives the output directly, so one must be careful > to set the equipment to 1M Ohms input impedance or use a buffer > externally, which is what we did to measure the attached PN plot. > > Bye, > Said > > _______________________________________________ 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.