Michael,

        A pulse will travel in a wire around 1 foot/nanosecond.  So, your
resolution will be directly related to pulse width.  One nanosecond is
half of a 500 MHz cycle.  Get where I'm going with this???

Larry


michael brown wrote:
>
> Hello all,
>
> I wish to build a PIC based reflectometer to use in my business for
> measuring the length to network wiring.......

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