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Re: [Amps] Measuring RF Power

To: "amps@contesting.com" <amps@contesting.com>
Subject: Re: [Amps] Measuring RF Power
From: David Kirkby <david.kirkby@onetel.net>
Date: Sat, 26 Mar 2005 00:37:49 +0000
List-post: <mailto:amps@contesting.com>
PS, the average power of a 1V peak sine wave across 1 Ohms is 1/2 W, as 
we all know.

You can demonstrate mathematically. Just integrate the shape of the 
power waveform (which is sin^2) over some integer multiples of the cycle.

In[2]:= Integrate[ Sin[x]^2,{x,0,2 Pi}] / (2 Pi)

        1
Out[2]= -
        2

But the RMS is *not* 1/2 W, as I have demonstrated.

RMS power is *not* average Power for a sinusoidal voltage waveform.

If you insist on disagreeing Rich, please substantiate it.

-- 
Dr. David Kirkby, 
G8WRB

Please check out http://www.g8wrb.org/ 
of if you live in Essex http://www.southminster-branch-line.org.uk/



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