>
>
>Some time ago I looked at pin 9 on the scope.  There was a very short
>spike every second.  I was hoping to be able to count up perhaps
>15 minutes of spikes and then put out a 15 minute mark (trace offset)
>on my digital record.  This would give me a clock correction every
>15 minutes.  The problem is that I don't know how to build such
>a circuit.  Any ideas out there?

It's a 1 pulse per second output, sync'ed to GPS time. (1PPS).

15 minutes is 900 counts at a frequency of 1Hz.  A 10 bit counter,
with a bit of logic to reset at 899 would be the ticket.

KR


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