[AMRadio] AM power

[Gary Schafer]

Why do you say that? 
I am assuming you are talking about peak envelope power here?

73
Gary  K4FMX

> -----Original Message-----
> From: W2XJ [mailto:w2xj at nyc.rr.com]
> Sent: Sunday, June 19, 2011 1:30 PM
> To: garyschafer at comcast.net; Discussion of AM Radio in the Amateur
> Service
> Subject: Re: [AMRadio] AM power
> 
> But a scope will be overly conservative compared to a true peak power
> measurement.
> 
> On 6/19/11 1:00 PM, Gary Schafer wrote:
> > 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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