Smith Chart Quiz - RadioBanter

#11

October 18th 03, 07:41 PM

Reg Edwards

Posts: n/a

To anybody interested.

We have a HF Transmitter + 50-ohm coax + SWR meter + Tuner + Feedline of any
Zo + Antenna.

Suppose it is all tuned-up and ready to go. The transmitter is loaded with
exactly 50-ohms resistive.

Now change the 50-ohm coax to shorter length of 75-ohm Zo.

As everybody agrees (after perhaps a little meter recalibration) the SWR
meter indication will not change. BUT THE TRANSMITTER WILL NOW BE
INCORRECTLY LOADED.

Where does the inconistency lie ? Does it lie in the change in effective
source impedance?

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