[time-nuts] Speaking of Costas loops

[Attila Kinali]

On Wed, 3 Jul 2013 08:29:02 -0400
Bob Camp <lists at rtty.us> wrote:

> There are two batches of GPS / WAAS sats up there:
> 
> 1) The ones with numbers above 100 that are geosync and that only do WAAS
> 
> 2) The ones with numbers <= 32 that do nav. These are not geosync. 
> 
> I believe the only ones with corrected / high stab clocks on board are
> those in the second group. The stuff in the first group aren't dedicated
> sats, just leased transponders on conventional multipurpose geosync birds. 

I don't know about WAAS, but AFAIK the EGNOS signals are generated on
ground using Cs references and retransmitted by the satelites using
a "bend pipe". Ie. the signals should be of time-nut quality even without
high accuracy frequency standards in the birds themselves.

(Sorry, i'm not able to find where i read about that, so no references today)

			Attila Kinali

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