[time-nuts] Can (will) a M12+T generate a negative sawtooth message ?

[Hal Murray]

The ref output is the minimal delay through the chip covering the input and 
output pad buffers.  It will vary slightly with temperature and voltage.

There are no negative delays in that sort of chip.  It's just a bunch of 
gates/buffers with a carefully calibrated delay.  (For a negative delay, you 
would need something like a PLL.)

If the delay from the M12+T might be negative, set the antenna cable delay to 
be a bit short and add on a constant in software.


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