[time-nuts] Speaking of Costas loops

Bob Stewart bob at evoria.net
Tue Jul 2 14:43:57 EDT 2013


Hi Ed,

Are you talking about using GPS satellites, which means you have to have an extremely accurate clock to know where they are to correct for doppler, or are you talking about WWV, which means you have to deal with multi-path, atmospheric doppler, fading, and propagation?

Bob - AE6RV




----- Original Message -----
> From: ed breya <eb at telight.com>
> To: time-nuts at febo.com
> Cc: 
> Sent: Tuesday, July 2, 2013 1:21 PM
> Subject: [time-nuts] Speaking of Costas loops
> 
> Here we go again - the first send didn't seem to get through. This is the 
> second attempt.
> 
<snip>
> For my needs, I'm more of a frequency-nut - I usually don't care about 
> getting time info, but I'd like perfect 10 MHz for reference. Can using only 
> the carriers lead to simple ways to get the same (or better) frequency stability 
> as a conventional GPSDO, but without the time and location info, or is it 
> pointless to worry about it, and just go with full GPS decoding of everything? 
> Or, is carrier-phase just an enhancement only if you already have the full GPS 
> info?


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