[AMRadio] AM power

[W2XJ]

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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