[Amps] Last question on SWR

[Manfred Mornhinweg]

Bill,

> This has been a great discussion. Let's see if I learned anything.
> 
> Here's the setup. Remember, everything is lossless and the antenna has
> 10% reflected power.
> 
> amplifier>>>SWR meter 1>>>tuner>>>SWR meter #2>>>antenna
> 
> The amp and turner are adjusted so SWR meter #1 shows 1000 watts
> forward and zero reflected. 
> 
> The question is:  What does SWR meter #2 show?
> 
> I think it would show 1100 watts forward and 100 reflected..
> 
> Correct? 

Almost correct. But not exactly. By the logic of forward and reflected 
powers, the reflected power is a percentage of forward power, not of 
real power. And 100 is only 9.09% of 1100.

So, with 1000W indicated on the first meter, and the antenna 
"reflecting" 10% of the "forward" power, the second meter should read 
1111W forward and 111W reflected power.

> Or back to school?

Probably not! Relax! :-)

Manfred

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