Monitoring WWVB 

I had a thought about monitoring WWVB on 60KHz the other day. Since I have a really stable source of time (GPS disciplined Rubidium Oscillator) why not log the phase of WWVB relative to the GPS time instead of monitoring the amplitude of the signal?

I can think of a few ways to do this that would be easy to implement:

1) Pure analog setup with a ramp and a sample/hold circuit
2) Frequency counter with a & b inputs to measure the time.
3) Microprocessor to measure the time difference.

Since I have a suitable counter, maybe I'll set up to watch the time difference over a few days to see how it looks before deciding on a final approach.

Thoughts anyone?

Cheers,

Keith
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