[time-nuts] IC for 1 PPS Output
cfharris at erols.com
Fri Apr 7 12:07:43 EDT 2006
Bill Janssen wrote:
> Why do you need to drive the cable with a 50 Ohm source. You need a 50
> Ohm load on the receiving
> end to reduce reflections. But that is not a problem for the drivers. I
> would use a low impedance
> driver to minimize losses in the driver.
What you say is completely true, but in the case where you have a less
than perfect match at the load side, having a matched source will reduce
the edge smearing caused by the reflections off of that the load that would
otherwise reflect back off of the source...
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