From: PointedEars@web.de   
      
   Paul B. Andersen wrote:   
   > Den 25.11.2025 00:55, skrev Thomas 'PointedEars' Lahn:   
   >> J. J. Lodder wrote:   
   >>> Thomas 'PointedEars' Lahn  wrote:   
   >>>> The satellite's clock is not manipulated; never has been.   
   >>>   
   >>> FYI, Satellite GPS clocks are steered to remain in sync   
   >>> with the master GPS clock at USNO.   
   >>   
   >> No, they are NOT "steered"; they never were.  The beat frequency is not even   
   >> adjusted by a frequency synthesizer anymore (as it was with the NAVSTAR   
   >> NTS-1 test satellite in 1977), but the *beat* frequency (how many cycles are   
   >> counted as 1 second) is adjusted *once* (it is reduced according to GR)   
   >> *before* the clock is placed in orbit.  In addition, a correction value to   
   >> account for orbital variations is in included in the signal payload, as well   
   >> as ephemerides updates.   
   >   
   > Yes.   
   >   
   > But what Lodder probably meant was that the GPS system time at   
   > message transmission is 'steered',   
      
   A very benevolent interpretation, at best.  They explicitly said that *the   
   clocks* would be "steered to remain in sync with the master GPS clock at USNO".   
      
   > As you probably know:   
   > The SV-clock may be several μs off sync, but the SV will send   
   > the correction polynomial so the time can be corrected in the receiver.   
   > The correction polynomial is uploaded to the SV typically once a day,   
   > so the corrected time is 'steered' to be in sync with GPS-time.   
      
   That is what I just said.   
      
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   PointedEars   
      
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