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03/06/2005 Entry: "2nd Cesium Standard On Line"
I've added a second HP 5061A. It's somewhat older than the other one, but has a fairly new FTS tube and a replacement late-model 10811A oscillator. Here are the pertinent details:
HP 5061A SN 1248A00857
FTS Tube Model 1-105, SN 1098
Placed in service 6 March 2005.
This unit looks like it might have come out of Loran or some other positioning service as it has a sticker telling which direction to adjust the C field if range between base and mobile increases or decreases. It also has some interesting extra connectors, but I'm not sure if they still do anything.