On 11/8/2011 4:15 PM, Owen Duffy wrote:
John wrote in :

...

The manual for the Fluke generator says it is 50 ohms output Z. I used

Ok, be aware that sometimes that impedance is gauranteed to less than
full output.

If it is 50+j0, then your Vf reading should not change in magnitude with
load variation. If it does change, you have to factor it into the calcs
as in the AN.

your Line Loss Calculator to find that my 2.4m coax is 50-j0.1 and
0.671dB loss.

Since it seems you are applying the cal short at the load end of that
line section, then its loss is not so important (so long as it is
stable).

Okay! This is another answer for which I was hoping. This simplifies
everything.

Thanks again, Owen.

John