Hello Ed, Azelio,

We should also compare the same parameters. Sawtooth error of the m12+ of 
+/-25ns is not its standard deviation, it's max/min. Compare that number to 
your 30ns max/min measurement on the 5372a.

Standard deviation of the m12+ is around 2ns with correction. That needs to be 
compared to the 5ns you measure on the 5372a as that is the best performance 
you will get from the CW12. Yes the uncorrected 1pps of the m12 is worse, but 
it is designed to be used with correction. So in the end the m12m still 
performs better than the CW12.

Bye,
Said

Sent From iPhone

On Mar 29, 2012, at 1:56, Azelio Boriani <azelio.bori...@screen.it> wrote:

> We (that is my company) use the CW12-TIM (NMEA version) and its PPS wonders
> as usual, nothing different from a uBlox LEA-5T or the M12M.
> 
> On Thu, Mar 29, 2012 at 9:32 AM, Hal Murray <hmur...@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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