FG> I believe there's a 100hz subcarrier on all 
 FG> the WWV/WWVH broadcasts
 FG> with time and date information. 
 TM> That is correct.
 FG> WWVB consists of nothing but such information, on its carrier.
 TM> That is incorrect.  WWVB does not use a 100hz subcarrier.
 FG> (Working from menory, now. I do have the exact information
 FG> somewhere...) 
 TM> Bad mistake.  Here is the correct information from NIST Special
 TM> Publication 432:
 TM> The WWVB time code is synchronized with the 60-kHz carrier and is
 TM> broadcast continuously at a rate of 1 pulse per second using pulse-
 TM> width modulation.  Each pulse is generated by reducing the carrier
 TM> power 10 dB at the start of the second, so that the leading edge
 TM> of every negative-going pulse is on time.  Full power is restored
 TM> either 0.2, 0.5, or 0.8 s later to convey either a binary "0",
 TM> "1", or a position marker, respectively.
 TM> PS: The Radio Shack clock picks up WWVB, not WWV.
 
   Agreed. I didn't mean to imply that WWVB used a subcarrier. What I 
couldn't remember was the pulse width modulation format, and if the data it 
represents is the same data as on the 100hz subcarrier of the HF stations.
 
   Somewhere I also have the NBS (as it was at the time) publication from the 
late 1970's.
 
   Frank
 
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