[time-nuts] GPS 1PPS, phase lock vs frequency lock, design

[Bob kb8tq]

Hi

The TBolt is a very unique design. It directly uses code phase information 
against the OCXO. The net result is really no different than the “correction
message” approach, but it is a different implementation. Since you can’t 
*buy* the guts of a TBolt to strap into a DIY GPSDO, it’s not generally part
of a “I want to build a GPSDO from scratch” conversation.

Bob

> On May 29, 2019, at 9:50 AM, Alberto di Bene <dibene at usa.net> wrote:
> 
> On 2019-05-29 14:53, Attila Kinali wrote:
>> The saw-tooth correction is the error of the PPS signal, as generated by
>> the hardware, and where it really should be. The clocks of most GPS receivers
>> are in the order of 20-60MHz and are usually unsteered TCXOs (or even XO for
>> the cheap ones). Hence the granularity at which the PPS can be generated
>> is fixed. The saw-tooth correction gives you a higher accuracy (or removes
>> noise) from what you would get without.
> 
> Am I correct if I suppose that the Trimble Thunderbolt, which uses the 10MHz OCXO as clock for the processor, does not need any saw-tooth correction ?
> 
> TNX
> 
> 73  Alberto  I2PHD
> /<<< http://www.weaksignals.com >>>/
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