Alex and Rolf came over today with a Tempus LX GPS network timing server. This has an IRIG-B output and a 1PPS output. It can also be setup to act as an NTP server (although we did not set that up).
This was placed at waist height in the 1X7 rack. We took the cable running to the presumably roof mounted antenna from the VME timing board and connected it to this new timing server. We also moved the source of the 1PPS signal going to the master timer sequencer (big blue box in 1X7 with fibers going to all the front ends) to this new time server. This system is currently working, although it took about 5 minutes to actually acquire a timing signal from the GPS satellites. Alex says this system should be more stable, with no time jumps.
I asked Rolf about the new timing system for the front ends, he had no idea when that hardware would be available to the 40m.
Currently, all the front ends and the frame builder agree on the time. Front ends are running so the 1 PPS signal appears to be working as well. |