[time-nuts] BPSK Receiver & GPS Antenna siting
Magnus Danielson
magnus at rubidium.dyndns.org
Fri Sep 28 03:38:16 UTC 2012
On 09/28/2012 01:34 AM, Bob Camp wrote:
> Hi
>
> A PLL locks to phase. If the phase switches by 180 degrees, the phase tracking switches signs. There's no way to track that. You either need to double the frequency (and thus eliminate the modulation) or demodulate the signal and lock to the result. If you simply put up a real narrow filter and hit it with continuous 180 degree phase shifts, the output will be nothing at all…
Then there is the Costas loop. It's just a fancy PLL.
Cheers,
Magnus
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