vp equation for TDR

[Brad Shankwiler]

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Jason,
   Thank you for the information. What I am confused by is this: our cable
is 6ft and is polyethylene insulated. However, it connects to a pair of
unisulated waveguides buried in the ground. Do I just ignore the cable and
use the vP setting of 0.99 for the un-insulated rods???

thanks,
Brad Shankwiler