[time-nuts] test after email address change and repost of PRS10 question.

[mike cook]

Jarl Risum gave me some info which could explain that. His PRS10 1PPS rise time , taken at the unit DB connector pin, was about 50ns, which is in the same ballpark as mine, but he noted that if the Breaklout Board is installed , the signal  passes through a two Schmitt inverters (74HC14s). These might well stiffen it up, having a rise time of 7ns, though adding delay. So if your box has similar interface circuitry that could be it. 

Thanks for your input.


Le 28 janv. 2014 à 19:16, Robert Watson a écrit :

> Mike,
> 
> I just measured my FS725  (a PRS10 in a box). The nearest scope was an
> analog with only 100MHz bandwidth. The PPS risetime was about 5.5ns.The
> usual analog scope risetime is 0.35/bandwidth so that puts scope risetime
> around 3.5ns. Whatever the PPS risetime really is, it's an order of
> magnitude less than your 70ns for sure.
> 
> Best,
> 
> Robert.
> 
> 
> On 28 January 2014 14:30, Chuck Harris <cfharris at erols.com> wrote:
> 
>> Time-nuts isn't yahoo.  It is something that John Ackermann
>> put together called febo.com.  Febo is one of John's cats.
>> 
>> Most probably, the OP's email program is set to not display
>> emails which appear to originate from his address...
>> 
>> -Chuck Harris
>> 
>> 
>> Chris Wilson wrote:
>> 
>>> 
>>> 
>>> My recent attempts at posting have been all been blocked for some
>>>> reason so I am switching email address in the hope that that corrects it.
>>>> 
>>> 
>>> Here is my last one, hoping that it is not a repeat for you guys.
>>>> 
>>> 
>>> Hi,
>>>>   I have just brought my PRS10 out of mothballs and am trying to
>>>> get a good lock to my TBolt 1PPS.
>>>>   The 1PPS OUT signal from my PRS10 has a very slow rise time, in
>>>> the order of 70ns.  I would be grateful, if anyone here has one on
>>>> their bench, to let me know what theirs is. I can't find any
>>>> specification in the literature.
>>>> Thanks and have a good day.
>>>> Mike
>>>> 
>>> 
>>> 
>>> 
>>> 28/01/2014 11:37
>>> 
>>> Hi Mike.
>>> 
>>> Both messages (the earlier one from the orange.fr address and this one
>>> from the sfr.fr address) are showing. If you read the group using
>>> e-mail just CC the messages you post back to yourself and filter into
>>> the groups folder. Seems Yahoo changed things (again) recently.
>>> 
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