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

Alexander Pummer alexpcs at ieee.org
Tue Apr 5 01:07:54 UTC 2016


and it is relative easy to make 10MHz from 8MHz with analog frequency 
manipulation, which generates less jitter
73

On 4/4/2016 4:27 PM, Attila Kinali 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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