Unfortunately, when they changed the format of WWVB recently to include
phase-modulated data it broke all the receivers that had used it as a
frequency standard, so we cannot use that argument. A receiver to lock
to the new format has been documented here, but there may be only a
handful actually in existence. For those looking for that type of
standard, it may be better to rely on the Navy VLF transmitters such as
NAA on 24kHz. Who knows, but I expect they are not up to be defunded.
David N1HAC
On 8/30/18 1:23 PM, jimlux wrote:
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?
Mike
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
didn't exist.
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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