Hi John, Thanks for this interesting insight!
However, I would think it is measured at 50 ohms as the outputs of the PPS on the OctoClock-G are SMA connectors. As far as I am aware, SMA connectors do not have a 1 Mohm impedance. I found that inverters are placed before the PPS outputs, which have a minimum output of 2.4 V and a typical output of 3.4 V. The input of the USRP B210 (which takes in the signal from the OctoClock-G) has an input range of 1.8 V to 5 V. So, I am not ruling out that mismatching or matching at 1 Mohm can work too. So it is not really an error in the datasheet. But, it would have been nice if they had added an extra row in the table, pointing out at which impedance this was measured, similar to the 10 MHz signal.
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