24-10-2024, 03:46 PM
You have WWV and its subsidiaries there, they are much the same as MSF really. MSF is as accurate as, if not better than, GPS. Even the carrier frequency is locked to atomic time.
As GPS uses "below the noise" signal levels it needs a lot of averaging to get good data, this helps getting a good DO (defined oscillator). MSF however is (here at least) a big signal and can be used directly especially for near as damn it seconds pulses. For a stable DO some temporal averaging is used such as a crystal PLL.
I don't have a GPSDO but do have a 198kHz (BBC Radio 4 longwave, the carrier is from a Rubidium standard) frequency source, it works well.
As GPS uses "below the noise" signal levels it needs a lot of averaging to get good data, this helps getting a good DO (defined oscillator). MSF however is (here at least) a big signal and can be used directly especially for near as damn it seconds pulses. For a stable DO some temporal averaging is used such as a crystal PLL.
I don't have a GPSDO but do have a 198kHz (BBC Radio 4 longwave, the carrier is from a Rubidium standard) frequency source, it works well.
I want a PNP valve!
