[time-nuts] 10MHz LTE-Lite
paulswedb at gmail.com
Thu Nov 20 20:24:39 EST 2014
Thanks missed that.
On Thu, Nov 20, 2014 at 6:17 PM, S. Jackson via time-nuts <
time-nuts at febo.com> wrote:
> 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.
> 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
> 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.
> In a message dated 11/20/2014 14:34:32 Pacific Standard Time,
> alex at pcscons.com writes:
> Hi Said,
> do you have any information about how that "TimePod 5330A works" any
> principal description?
> 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
> > 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
> > almost perfectly 6dB lower at 10MHz versus 20MHz.
> > While phase noise follows theory, it does seem that the DIP14 metal
> > 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
> > 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
> > 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
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