[Gb-ccb] 1PPS signal specifications

[Martin Shepherd]

I need some more information about the GBT 1PPS signal. From previous
email, I know that this will arrive at the CCB via RG58 coax
terminated in a male BNC connector. What I now need to know are the
mark-space ratio and amplitude of the 1PPS pulses, and whether the
coax is going to be sufficiently long that I need to guard against
ground loops through the cable shield (eg. I could either use Amphenol
ground-filtered BNC sockets, along with extra RFI filtering of both
the shield and signal connections, or I could use normal uninsulated
BNC sockets, and just RFI filter the signal connection).

Martin Shepherd  (mcs at astro.caltech.edu)