[time-nuts] Why are 1PPS signals so skinny?

[Michael Blazer]

Magnus,
https://assist.daps.dla.mil/quicksearch/  is the search site for 
military standards.  MIL-188-155 is not found.  Could it be another dash 
number?
Mike

On 5/14/2012 2:20 PM, Magnus Danielson wrote:
> Mark, Azelio and Björn,
>
> On 05/14/2012 06:33 PM, bg at lysator.liu.se wrote:
>> Mark&  Azelio,
>>
>> Or even 10V into 50ohm, 20us... See figure 3-4 in ICD-GPS-060.
>>
>>      http://www.navcen.uscg.gov/pdf/gps/ICD-GPS-060B.pdf
>>
>> More modern 3-5.5V into 50ohm, 20us.
>>           
>> http://contracting.tacom.army.mil/majorsys/jab/DAGR%20Interface%20Specification.pdf
>>
>> Above are two standards demanding short skinny 1PPS pulses. Are there 
>> any
>> other standards with distinct shape requirements on 1PPS pulses?
>
> You need to look at MIL STD 188/155 which if I recall things was 
> initially formed in the 60thies.
>
> An AccuBeat presentation actually says that the PPS was originally 
> defined in it.
>
> The MIL STD 188/155 is actually a 10 V peak level, so it was much 
> hotter than we are used to know. It specified 5 MHz as base frequency, 
> or power of 2 multiples (10, 20, 40 MHz... ).
>
> It was later reformulated in the PTTI spec, which ICD GPS 060 is a 
> derivate. The 50 ns rise and 1 us fall slopes comes from that spec.
>
> I was not able to find MIL STD 188-155 on the net right now, but I 
> have been able to download it before, so if someone is a more lucky it 
> should surface. I should have my download somewhere.
>
> Cheers,
> Magnus
>
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