[AMRadio] AM power


Bob Macklin macklinbob at gmail.com
Sun Jun 19 13:06:39 EDT 2011


OK! So how are you supposed to measure Peak Envelope Power?

I don't have a problem because I cannot do more than 200W.

Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
----- Original Message ----- 
From: "Gary Schafer" <garyschafer at comcast.net>
To: <w2xj at w2xj.net>; "'Discussion of AM Radio in the Amateur Service'" 
<amradio at mailman.qth.net>
Sent: Sunday, June 19, 2011 10:00 AM
Subject: Re: [AMRadio] AM power


> 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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