> Below is a plot so you could see exactly what I measured. What is peculiar
> is that the time jumps by exactly 100ns to 200ns. Almost as if the GPS
> receiver decides to offset the time by twice the amount I set it to. Which
> is why I initially thought it might be a firmware thing. I suppose
> multipath is a good explanation, it is just odd that the time error is
> exactly 100ns.

Hi Stephan,

A quick test you could perform is set the offset to 125 ns instead of 100 ns 
and see if the jumps still occur, still occur at 100 ns, or now occur at 125 ns.

Since you have three M12's offset the third one by 150 ns and see if it 
experiences jumps too.

Question -- are you using the external 10 MHz reference input or output for any 
of your 53131A counters?

/tvb

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