[time-nuts] Need Time Help

Hal Murray hmurray at megapathdsl.net
Tue Oct 4 03:58:15 EDT 2016

david-taylor at blueyonder.co.uk said:
> You can use a GPS puck or equivalent with PPS output to get the sort of
> accuracy you need.  ..: 

PPS output is only half the battle.  You also have to get it into the system 
that needs it.

A modem control signal on an old fashioned serial port (not USB) is the 
classic approach.  Unfortunately, many modern systems, especially laptops, 
don't have serial ports.

GPIO pins on things like a Raspberry Pi also work well.

PPS over USB adds the USB polling interval to the error budget.  It will 
probably work well enough if the goal is under 15 ms.

These are my opinions.  I hate spam.

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