At 11:00 AM 3/26/2004 +1200, Jinx wrote:

>> I'm trying to measures RF time-of-flight up to a few mm accuracy

If you can do a linear VCO, then you can sweep it with a triangle wave, and do a homodyne mixer.  The VCO now, mixes with what it was a few nS ago, that product is a frequency that tells you distance, if you know the slope rate in MHz/uS

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