Bob, As John says it's just part of the definition of PEP that the FCC gives. I would suspect that their wording is meant to preclude anyone coming up with some creative ways to get around what they have in mind.
They say it must be measured over at least one RF cycle. That means that you may measure as many cycles as you wish as long as you are measuring them at the peak or crest of the modulation envelope. The easiest way to measure PEP is to just measure the highest peak of the modulation envelope on your scope like John mentioned. You measure the peak to peak value, divide that in half for the peak value, multiply by .707 to give RMS, square that and divide by your load impedance (50 ohms). That gives you average power at the peak of the modulation wave form which is Peak Envelope Power. 73 Gary K4FMX > -----Original Message----- > From: Bob Macklin [mailto:[EMAIL PROTECTED] > Sent: Thursday, February 14, 2008 6:33 PM > To: [EMAIL PROTECTED]; Discussion of AM Radio in the Amateur Service > Subject: Re: [AMRadio] Modulation power required > > "E squared / R will give average power." > > So how do you do that on a single cycle? > > Bob Macklin > K5MYJ > Seattle, Wa, > "Real Radios Glow in the Dark" > > ----- Original Message ----- > From: "Gary Schafer" <[EMAIL PROTECTED]> > To: "'Discussion of AM Radio in the Amateur Service'" > <amradio@mailman.qth.net> > Sent: Thursday, February 14, 2008 3:13 PM > Subject: RE: [AMRadio] Modulation power required > > > > > > > > > -----Original Message----- > > > From: [EMAIL PROTECTED] [mailto:amradio- > > > [EMAIL PROTECTED] On Behalf Of Bob Macklin > > > Sent: Thursday, February 14, 2008 5:19 PM > > > To: Discussion of AM Radio in the Amateur Service > > > Subject: Re: [AMRadio] Modulation power required > > > > > > Why not just calibrate a Trapezoid display for MAXIMUM PEP? The just > watch > > > the trapezoid display? > > > > > > Watching a single cycle on a scope is a difficult thing to do. > > > > > > HOW DO YOU AVERAGE PEP ON A SINGLE CYCLE? > > > > E squared / R will give average power. > > > > 73 > > Gary K4FMX > > > > > > ______________________________________________________________ > > Our Main Website: http://www.amfone.net > > AMRadio mailing list > > Searchable Archives: http://www.mail- > archive.com/amradio@mailman.qth.net/ > > List Rules (must read!): http://w5ami.net/amradiofaq.html > > List Home: http://mailman.qth.net/mailman/listinfo/amradio > > Help: http://mailman.qth.net/mmfaq.html > > Post: mailto:AMRadio@mailman.qth.net > > To unsubscribe, send an email to [EMAIL PROTECTED] with > > the word unsubscribe in the message body. > > ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
