[time-nuts] CW12-TIM vs M12M and the world

Hal Murray hmurray at megapathdsl.net
Thu Mar 29 07:32:13 UTC 2012


>> The sawtooth error on the Motorola M12+ is about +/- 25ns, while the 
>> CW12-TIM has a sawtooth error of +/- 2 ns, so correcting for the 
>> sawtooth error is not as critical with the CW12-TIM. 

> The first claim
>> The sawtooth error on the Motorola M12+ is about +/- 25ns
> is correct but are you absolutely sure that the second claim is correct
> too?????

> It would mean a factor >10 improvement of the CW12-TIM against the M12 which
> is hardly believeable.  

The 25 ns probably comes from period of the the free running clock they are 
using.  It doesn't seem unreasonable to me to get 10x better if they use a 
GPSDO for the local clock so they can get the PPS edge right where they want 
it.



-- 
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