Re: [time-nuts] GPS frequency uncertainty

2019-07-10 Thread Bob kb8tq
Hi > On Jul 10, 2019, at 4:26 PM, Hal Murray wrote: > > >> Would someone please expand on what the practical frequency calibration limit >> might be? > > That's not quite a well formed question yet. You need to say something about > the time scale. What are you trying to calibrate? > >

Re: [time-nuts] GPS frequency uncertainty

2019-07-10 Thread Hal Murray
> Would someone please expand on what the practical frequency calibration limit > might be? That's not quite a well formed question yet. You need to say something about the time scale. What are you trying to calibrate? Poke around for some ADEV curves. Find one for your device (or

Re: [time-nuts] GPS frequency uncertainty

2019-07-10 Thread Bob kb8tq
Hi The whole clock error / orbit error thing can be corrected after the fact with data from various agencies. It impacts survey work at least as much as timing. Looking at it that way, it does not really present a hard limit. The “what’s the frequency limit?” question depends on just what

[time-nuts] GPS frequency uncertainty

2019-07-10 Thread Perry Sandeen via time-nuts
Yo Bubba Dudes! In a number of fascinating and highly educational for me were the explanation of accuracy by TVB and others.  I learned quite a lot, thank you. Bob mentioned about slight orbital variations in the GPS satellites. IIRC those slight variations meant that you could only reliably get