[Elecraft] Power measurement with a 'scope

Sat Feb 16 14:26:01 2002

Direct conversion from pk-pk to rms voltage:

Vrms = Vpp x 0.35355 (ARRL 1998 Handbook conversion factor, page 6.6) 

Gary Surrency AB7MY

On Fri, 15 Feb 2002 20:19:01 EST [email protected] writes:
> In a message dated 2/15/2002 6:54:40 PM Central Standard Time, 
> [email protected] writes:
> 
> 
> I have a 100 MHz 'scope (Tektronix 465, Ebay, about $60). How is 
> QRPp 
> measured using a scope and a dummy load 
> 
> +++++++++++++++++++++++++++++++++++++++++++++++++++++
> 
> 
> Hi
> 
> A scope measures peak to peak voltage to convert to watts. First 
> measure the 
> peak to peak voltage at the dummy load. Convert to peak by dividing 
> by 2 then 
> convert to rms volts by dividing by 1.414. Then convert to watts by 
> squaring 
> the rms voltage and dividing by 50 ohms
> 
> Don Brown
> KD5NDB
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Gary Surrency AB7MY

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