[time-nuts] WWVB BPSK Receiver Project?

[J. Forster]

Jim wrote:

a square wave,
>> multiplied by itself, has the same output as input.
>
> Oh... I was assuming you had the two quadrature square waves (which are
> just like the saturated LO for the mixer in RF land)

You don't have two square waves in quadrature. You have the (amplified)
signal from the antenna.


>> A Costas Loop recovers the bit stream and the carrier frequency (from
>> the local VCO) from a BPSK. It is self syncronizing.
>
>
> Yes.. but if you don't care about the bitstream, and you want simpler
> hardware, squaring works. (especially if the modulator doesn't have good
> carrier suppression)

I think a better implementation would be:

Analog multiplier
Adaptive comparator (slice level = 1/2 P_P signal)
Flip Flop
Rabbit ears filter at 60 kHz

-John

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