[time-nuts] BPSK Receiver & GPS Antenna siting

[Magnus Danielson]

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