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[Amps] PEP power..

To: <amps@contesting.com>
Subject: [Amps] PEP power..
From: "Tom W8JI" <w8ji@w8ji.com>
Date: Sun, 15 Oct 2006 21:42:17 -0400
List-post: <mailto:amps@contesting.com>
>> recall for many years "myself" believing this. Though 
>> very  momentary
>> peaks
>> may be 4 or 5 times that , the "envelope" over one cycle 
>> would  average
>> about 2
>> times.

Lou,

You probably know this but it is worth saying again.

PEP is the peak of the RF envelope, or the short term peak 
"RMS" or work power.
It isn't a one RF cycle peak, and it certainly isn't the 
peak voltage times the peak current.

What Gary is talking about is the real PEP power, or the 
highest very short term value of RMS power in a speech 
envelope. Since the speech envelope it is not a two equal 
steady tone signal that produces a sine wave shaped 
envelope, the ratio of peak to average is probably much 
greater than two.

None of this has anything to do with the individual RF 
cycles, which are always a near perfect sine wave at the 
operating frequency in a transmitter without harmonic 
radiation problems. It's all about the envelope shape, which 
normally is less than a few thousand Hz in frequency.

73 Tom 


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