[time-nuts] Cal standards, WWVB, etc. was Re: WWV and legal issues
jimlux at earthlink.net
Thu Aug 30 13:23:20 EDT 2018
On 8/30/18 8:15 AM, Mike Bafaro wrote:
> According to what I have heard the 60KHz WWVB carrier is guaranteed accurate to the atomic standard and is considered traceable. I remember when I was in the Navy years ago I remember taking our unit's HP5245L for calibration and they used a VLF tracking receiver at 60KHz to do the calibration. If WWVB goes off the air what is the replacement for the 60KHz standard?
The 5245L is a 1960,70s vintage thing so I assume you were doing those
cals 40 years ago when inexpensive atomic standards like the SRS FS725
These days, I suspect that a $3000 Rb box or a GPSDO would have
sufficient accuracy for this sort of thing as a transfer standard, and
would be traceable. I can't imagine that a "over the air" signal
recovered from WWVB would be better than either of those two.
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