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Old August 18th 03, 09:14 PM
Tarmo Tammaru
 
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Default SWR will change with Source Z if you measure AT the Source


"Dr. Slick" wrote in message
om...

If you measure the SWR at point 1, you let Z1 (Zload) be 50 ohms,
and Zo is the output impedance of the PA. SWR meter1 should be
characterized to Zo.
snip
Reflection Coefficient looking into load = (Zl-Zo)/(Zl+Zo)

It should be easy to see from this well known equation that a
perfect 50 Ohm Zl will definitely change SWR as you change Zo away
from 50 ohms.


Slick


Looking at a book. Has the same equation, only thing is that Zo is the
impedance of the *coax*.

Tam/WB2TT