[AMRadio] Power Levels

[Wt8r at aol.com]

In a message dated 6/25/02 5:58:30 PM Eastern Daylight Time, w5omr writes:

> Subj:Re: [AMRadio] Power Levels 
> Date:6/24/02 8:44:58 PM Eastern Daylight Time
> From:<A HREF="mailto:w5omr at w5omr.shacknet.nu">w5omr at w5omr.shacknet.nu</A>
> Reply-to:<A HREF="mailto:amradio at mailman.qth.net">amradio at mailman.qth.net</A>
> To:<A HREF="mailto:amradio at mailman.qth.net">amradio at mailman.qth.net</A>
> Sent from the Internet 
> 
> :     I guarantee you that those running T-368s and BC-610s that are 
> properly
> : tuned ARE running illegal.  Then there are those that goes steps farther.
> : There are a few that run in the neighborhood of 10KW output, and some 
> that
> : are running just a few KW.
> 
> How do you figure?
> 
> At 2kVDC on the plate of the 250TH, drawing 250mA of Current equals (last 
> time I
> checked Ohm's Law of P=I*E) 500WDC Input power.
> 
> Efficiency of a Class C amplifier is *typically* 75%, right?
> 
> 75% of 500 = 375W of Output Carrier power.
> 
> 375 * 4 = (drum roll, please?) 1500W PEP Output.
>  
> 73 = Best Regards,
> -=Jeff/W5OMR=-

Jeff,

       I'm new to the list and would like to know more about how you arrive 
at your numbers.

       75% of 500W is 375 Watts output of carrier power alright, but where 
did the "X4" come from to get the PEP figure?

       I also wonder what the relationship is between RMS power and PEP 
power?  that is, if I tune my rig up to 1500 W PEP output and without 
changing anything, switch to CW, what is the reading on my wattmeter?

73 de
Dave in Dayton, WT8R


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