[time-nuts] 10MHz LTE-Lite
n1jez at burlingtontelecom.net
Fri Nov 21 18:02:52 EST 2014
U-Center vers 8.12
"A closed mouth gathers no feet"
On 2014-11-21 18:54, Jim Sanford wrote:
> what is the "ublox application"????
> wb4gcs at amsat.org
> On 11/20/2014 6:17 PM, S. Jackson via time-nuts 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
>> or similar presentations discussing the technology, but I don't know
>> 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
>>> I had sent out a 20MHz typical phase noise plot some weeks ago,
>>> 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
>>> course, but it does not seem like one version of the board or the
>>> advantages in terms of phase noise.
>>> I had also sent out a superimposed plot of the 20MHz and the
>>> 10MHz output of the same board at that time, and again the
>>> almost perfectly 6dB lower at 10MHz versus 20MHz.
>>> While phase noise follows theory, it does seem that the DIP14
>>> has a beneficial effect on the ADEV stability though. The plots we
>>> 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
>>> make sure its real.
>>> The 10MHz DIP-14 boards do not have an isolating buffer like the
>>> boards do, on these the TCXO drives the output directly, so one must
>>> 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.
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