Said Thanks missed that. Regards Paul On Thu, Nov 20, 2014 at 6:17 PM, S. Jackson via time-nuts < time-nuts@febo.com> wrote:
> 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. > _______________________________________________ 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.