[time-nuts] 10MHz LTE-Lite

Mike Seguin n1jez at burlingtontelecom.net
Fri Nov 21 18:02:52 EST 2014


U-Center vers 8.12

http://www.u-blox.com/en/evaluation-tools-a-software/u-center/u-center.html

Mike

---
73,
Mike, N1JEZ
"A closed mouth gathers no feet"

On 2014-11-21 18:54, Jim Sanford wrote:
> what is the "ublox application"????
> 
> Thanks,
> Jim
> 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
>> 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
>>> 
>> 
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> 
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