[time-nuts] Speaking of Costas loops

Bob Stewart bob at evoria.net
Fri Jul 5 15:44:04 UTC 2013


Wouldn't a Cs or Rb clock in orbit be slow due to relativistic effects?  I'm pretty sure there is a relativistic correction to the GPS clocks.

Bob - AE6RV



----- Original Message -----
> From: Bob Camp <lists at rtty.us>
> To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
> Cc: 
> Sent: Friday, July 5, 2013 10:33 AM
> Subject: Re: [time-nuts] Speaking of Costas loops
> 
> Hi
> 
> The sat needs to transmit at the GPS frequencies and have an uplink that works 
> exclusively with those frequencies. (or at least that sub band). A 
> "normal" transponder probably would not radiate at the GPS allocation, 
> simply to be a good citizen. I believe the "specialization" is simply 
> a frequency mod to allow WAAS to pass through. There is no mention of a space 
> qualified Cs and / or Rb flying on those birds and no indication that the ground 
> segment is controlling such a payload. If all that *was* present, then including 
> them in the normal navigation solutions would be a "zero cost" next 
> step. 
> 
> Bob


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