Amps
[Top] [All Lists]

Re: [Amps] Measuring RF Power

To: garyschafer@comcast.net, r@somis.org
Subject: Re: [Amps] Measuring RF Power
From: TexasRF@aol.com
Date: Tue, 22 Mar 2005 14:57:40 EST
List-post: <mailto:amps@contesting.com>
 
I lost track of who said what/when;
 In a sine wave the average voltage is zero therefore average power is  
zero.In an ac circuit with sine wave voltage, average current is also zero. One 
 
could be led to think that average power is also zero?
 
There is an RMS value related to peak value divided by square root of 2;  
same as peak times .707.
There is an effective value related to equivalent d.c. value which is also  
equal to the rms value.
 
See Radio Handbook Alternating Circuits, Impedance and Resonant Circuits  
Chapter, pg 3-3 in the 23rd Edition.
 
Historically we have always referred to peak power as 1.414 times rms power  
but not sure of the basis for this. Perhaps someone else knows.
 
73/k5gw

_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps

<Prev in Thread] Current Thread [Next in Thread>