[AMRadio] AM power

[Gary Schafer]

No it is not. But there is more than one way to express the same thing.

73
Gary  K4FMX

> -----Original Message-----
> From: W2XJ [mailto:w2xj at nyc.rr.com]
> Sent: Sunday, June 19, 2011 3:00 AM
> To: garyschafer at comcast.net; Discussion of AM Radio in the Amateur
> Service
> Subject: Re: [AMRadio] AM power
> 
> But that is not the FCC definition of peak power.
> 
> On 6/18/11 10:55 PM, Gary Schafer wrote:
> > Jeff,
> >
> > An easy way to prove this to yourself: set your scope on the output of
> your
> > transmitter for say 2 divisions of carrier. Then modulate it with a
> single
> > tone until the voltage on the scope doubles (4 divisions). That is
> 100%
> > modulation I am sure that you would agree.
> >
> > Now remove the single tone and modulate with your voice until the
> voice
> > peaks hit the same 4 divisions on the scope. You are now modulating
> 100%
> > with your voice. Your peak envelope power is exactly the same with
> your
> > voice as it was with the single tone. 4 times the carrier power.
> >
> > I urge you to carefully reread what I wrote in my long post on the
> subject.
> >
> > 73
> > Gary  K4FMX
> >
> >> -----Original Message-----
> >> From: amradio-bounces at mailman.qth.net [mailto:amradio-
> >> bounces at mailman.qth.net] On Behalf Of Geoff Edmonson
> >> Sent: Saturday, June 18, 2011 10:44 PM
> >> To: Discussion of AM Radio in the Amateur Service
> >> Subject: Re: [AMRadio] AM power
> >>
> >> On 06/18/2011 09:39 PM, Gary Schafer wrote:
> >>> For those that wonder how PEP is found, you do so by adding voltages
> >> in the
> >>> carrier with the voltage in the applied audio. Since 100% modulation
> >> is the
> >>> doubling of the plate supply voltage which causes the plate current
> to
> >> also
> >>> double (2x2=4) this is where the 4 times PEP comes from.
> >>>
> >> Which is true if you're modulating the carrier with a single-tone
> >> sinusoidal wave.
> >>
> >> that's not what comes out of our mouths.
> >>
> >> http://www.qsl.net/wa5bxo/asyam/aam3.html
> >>
> >> 73 = Best Regards,
> >> -Geoff/W5OMR
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