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

[Said Jackson]

I've evaluated various of their products including the 125 NCOs boards, and they are worse than 2ns in real world environments.. The m12+ timing replacement unit also only supports a small subset of the Motorola command set. It was useless as a replacement receiver for our Fury GPSDO when we looked into it. The ilotus M12M is still king of the hill in my opinion. Caveat emptor.

Bye,
Said

Sent From iPhone

On Mar 29, 2012, at 0:32, Hal Murray <hmurray at megapathdsl.net> wrote:

> 
>>> 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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