[ARC5] Audio power output - 10 meter BC-454

[Kenneth G. Gordon]

On 17 Feb 2013 at 13:07, Neil wrote:

> I make it a shade over 300 mW RMS.
> 
> 17.5 V peak x 0.707 to get the RMS voltage (12.37).
> 
> E^2is 12.37 x 12.37= 153.02
> 
> E^2/R = 153.02 / 500 = 306 mW
> 
> 73 de Neil ZL1ANM

Oh. So I am still wrong: P-P = RMS * sqrt2, whereas PEAK is 1/2 P-P.

OK. Your result actually makes more sense, since the original power output rating for the BC-
454 was supposed to be 300 mW.

So the correct formula is E(peak)^2/R=P, and not E(p-p)^2/R

Even so, it is still plenty loud enough for speaker output. I am using a Radio Shack 8 ohm CB 
speaker with a 500:8 ohm transformer in it, so the impedance of the result is 500 ohms 
average...,at least at some frequency in the range...

Ken W7EKB