On 03/29/2011 04:14 AM, tcxo wrote:
I'm concerned that, in their quest to address the needs of the general
public's radio clocks, NIST might overlook the frequency standards needs of
our metrology community. (Unless the metrology community provides adequate
feedback to NIST *before* it might be too late?)
According to their interpretations of ISO/IEC 17025, many customers require
metrology labs to include inter-comparison procedures for assurance. For
example, they might require a GPS disciplined house frequency standard to be
cross-checked against another non-GPS frequency standard (for assurance
purposes). In the past Loran-C served this need well as the alternate source
of traceable frequency. But with the demise of Loran-C, WWVB has become more
important for this purpose. Yes, we know that GPS out-performs WWVB for
frequency; but within a stated uncertainty (that's adequate for many
purposes), WWVB still supplies the alternate source of traceable frequency
comparison.
Do any of the resident gurus of this list have opinions as to whether or not
NIST's proposals might exclude WWVB as a source of traceable frequency
comparisons?
Adding a phase-modulation will, if done with care, have no significant
impact on receivers not capable of utilizing the modulation. Modulation
capable receiver should however be of interest, but I wonder if anyone
would make one commercially.
All of a sudden GLONASS receiver seems attractive.
Cheers,
Magnus
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