[time-nuts] Advise on building a DIY GPSDO?

[Bob Camp]

Hi

Even with an integer divide, it’s still going to toss in a full cycle of the TCXO from time to time. It will 
be an integer, except when it is not ….

Bob

> On Apr 4, 2016, at 7:27 PM, Attila Kinali <attila at kinali.ch> wrote:
> 
> On Mon, 4 Apr 2016 17:56:29 -0400
> Bob Camp <kb8tq at n1k.org> wrote:
> 
>> The variable frequency output on the uBlox (and other) GPS receivers
>> has come up many times in the past. 
>> If you dig into the archives you can find quite a bit of data on the
>> (lack of) performance of the high(er) frequency outputs from the various GPS
>> modules. They all depend on cycle add / drop at the frequency of their free
>> running TCXO. Regardless of the output frequency, that will put a *lot* of
>> jitter into the output. 
> 
> That's why you should put the output frequency of the ublox modules
> to an integer divisor of 24MHz. Ie 8MHz works but not 10MHz.
> 
> 			Attila Kinali
> 
> -- 
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