[time-nuts] 10MHz LTE-Lite

Jim Sanford wb4gcs at wb4gcs.org
Fri Nov 21 18:54:23 EST 2014

what is the "ublox application"????

wb4gcs at amsat.org

On 11/20/2014 6:17 PM, S. Jackson via time-nuts 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,
> alex at pcscons.com writes:
> Hi Said,
> do you have any information about how that  "TimePod 5330A works" any
> principal  description?
> 73
> 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
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