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I am currently using a QLG1 GPS to drive a shack clock, ProgRock,
U3S and a VFO. The 1PPS signals are put through an AND gate in the
U3S and the VFO to stop the display flashing when that unit is
not in use. I haven't looked at the signal on a scope to the
extent that you have but an AND gate might remove the grass that
you are seeing.
On 09/01/2021 09:28, Victor 4X6GP
Here is a picture of the 1 pps pulse from my QLG1, connected to
the GPS input of the Progrock:
Note the "grass" growing after the pulse. I believe that this
is crosstalk from the GPS data that is also carried in the cable
from the QLG1.
I wonder if this could be the cause of the poor accuracy of the
Progrock's output frequency?
I would disconnect it at the GPS, but I need it for my U3S,
which I also use the QLG1 with. I need to think about this.