Stefan, Dave:

we temporarily hooked up two timing signals in EY this morning and early afternoon. After acquiring data we have reverted the system back to its original configuration.

IRIG-B signal in frame.

To acquire the IRIG-B signal into the DAQ frame, we used the PEM channel H1:PEM-EY_MIC_VEA_MINUSY_DQ for this measurement. This channel was recording the IRIG-B signal between the times:

19:45 - 21:53 UTC.

To route the IRIG-B from the computer rack we borrowed the BNC coax cable which normally routes the 1PPS from the TCT to the first channel of the timing comparator. Therefore this comparator channel did not have any useful signal between the times 19:45 to 22:45 UTC. It is now restored to its running condition.

Local GPS receiver into Comparator.

To check what would happen if a local GPS receiver's 1PPS were to be connected to the timing comparator, we hooked the Symmetricom GPS receiver (which is in the VEA CDS rack and connected to an iLIGO GPS antenna on the roof) to the second comparator port. To acheive the connection, we found a long BNC coax cable which runs under the roll-up door between the CER/EBAY and the VEA. It was disconnected both ends. The GPS receiver was already powered on and had green LED indicators, so we assumed it has good satellite coverage. The comparator recorded a time difference of about 100nS. After the conclusion of the test, the long BNC coax cable was disconnected both ends and re-coiled.