Wow, I am surprised they allowed two weeks of playing around on an SSBN. I would have thought that on something like that the Navy would just replace it immediately. I was only in one once and I was real impressed by the professionalism of the crew. 73 - Mike
Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 848-245-9115 -----Original Message----- From: time-nuts <[email protected]> On Behalf Of Glenn Little WB4UIV Sent: Saturday, November 3, 2018 7:10 PM To: [email protected] Subject: Re: [time-nuts] hp 10544A and 10811A ovenized oscillators I had to "fix" a HP Cesium standard oscillator while on an SSBN. The problem was a failed op amp in the control circuit for the crystal oscillator. Due to lack of parts, the "fix" was to run the standard open loop with nothing controlling the crystal oscillator. Using an oscilloscope to compare the good standard with the open loop standard, I I was able to adjust the failed standard oscillator. It took over two weeks of adjusting the failed standard oscillator to keep the Lissajous pattern stable. The oven was off for a total of less than an hour during troubleshooting. Prior to failure the standard operated correctly for many months. I was surprised as to the amount of time for the oscillator to settle down. Glenn _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
