[time-nuts] NTP/1-PPS/RS232 question
"Björn"
bg at lysator.liu.se
Tue Aug 20 04:45:01 EDT 2013
> bg at lysator.liu.se said:
>> The PTTI 1PPS is defined in
>> http://www.navcen.uscg.gov/pdf/gps/ICD-GPS-060B.pdf
>> It is 20us long and common in some applications. However the voltage
>> levels
>> are a bit high...
>
> The section I saw said 10 V nominal, +1, -2. That's 8-11 V.
>
> I think that would work fine with a RS-232 receiver.
Yes, but driving 10V into _50ohms_ is a lot of power for a modern receiver...
/Björn
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