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, b...@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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