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

Tom Knox actast at hotmail.com
Thu Mar 29 15:17:57 UTC 2012


I just posted what I was sent for the manufacturer, warts and all. I did notice they were comparing to the M12+ or M12. I hope the specs are correct. I purchased one and will pass on measurement when I get a chance to test it.

Thomas Knox



> To: time-nuts at febo.com
> From: hmurray at megapathdsl.net
> Date: Thu, 29 Mar 2012 00:32:13 -0700
> Subject: Re: [time-nuts] CW12-TIM vs M12M and the world
> 
> 
> >> 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.
> 
> 
> 
> -- 
> These are my opinions, not necessarily my employer's.  I hate spam.
> 
> 
> 
> 
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