[AMRadio] PEP for AM


Gary Schafer garyschafer at comcast.net
Fri Dec 29 21:41:17 EST 2006



> -----Original Message-----
> From: amradio-bounces at mailman.qth.net [mailto:amradio-
> bounces at mailman.qth.net] On Behalf Of Geoff/W5OMR
> Sent: Friday, December 29, 2006 4:42 PM
> To: Discussion of AM Radio
> Subject: [AMRadio] PEP for AM
> 
> Anyway, I ran across this information, and thought I'd share it with the
> group here, so that some mis-conceptions about AM PEP could be cleared up.
> 
> (from: http://www.pc-oscilloscopes.com/articles/pc_oscilloscope_rf.html)
> 
> P E P (AM)
> % Modulation = (( PEP - PC) / PC) *100%
> 
> Example:
> Carrier Power PC = 100 W, PEP = 400 W.
> 
> Determine % Modulation
> M% = (( 400 - 100) / 100) *100% = ((20-10) / 10) *100% = 100%
> 
 
> --
> 73 = Best Regards,
> -Geoff/W5OMR

Hmmm, let's see, 400 watts -100 watts = 300 watts. Divided by 100 watts = 3.
Times 100% = 300% modulation..

I think they forgot the square root of the powers in the formula. 

73
Gary  K4FMX





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