How to interpret a simple TDR on length of coax

[wa9zvf]

So, for the TDR shown, how long is the coax?  Is it about 48 feet or 50 feet?  The four superimposed traces are an "open", 75 ohm, 50 ohm, and a "short"  Coax nominal impedance is 54 ohms.  Assume that the velocity factor is correct.  This is a question of how to interpret the trace. 


Ray Mikula

WA9ZVF

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[Bob]

Hi Ray,
That is a very interesting display. It illustrates the fundamental properties of the TDR.
Yes, your cable is about 48 feet long.

-73/Bob