> If you care about microseconds or nanoseconds, shortwave radio is a poor > choice. The length of the radio propagation path changes constantly! Not by > much but if you care about the nanoseconds. . . . > > If you REALLY NEED the nanoseconds, buy an atomic clock and have it > calibrated by your national standards people. If you don't REALLY NEED > the nanoseconds you can almost certainly save $50K - $100K.
GPS, eBay and the cell phone industry have changed that. Prices have fallen to well below $1K or even below $100 if you can do some soldering. For example Synergy's "12MT+" receiver has a 2 nanosecond (1 sigma) error and sells for $60 new. It is easy to find a good working Rubidium oscillator (a kind of "atomic clock") on eBay for $100 to $150. Chris Albertson Redondo Beach, California _______________________________________________ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
