[Amps] Input SWR revisited

[Paul Christensen]

> "I forgot to include that with just a 4 foot cable on the output of the 
> tuner
between tuner and 75 ohm load the SWR was 1.8:1. With the 10 foot cable SWR 
was 1.46:1.
With the 10 foot and 4 foot cable the SWR was 1.4:1"

In the above experiment, on what line section is the SWR being sampled to 
yield these results?   Before or after the tuner?   Also, do all line 
sections have a Zo = 50?

Paul, W9AC