To: | [email protected] |
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Subject: | Re: LF: Re: I: Fw: For today the FETs survived... |
From: | Andy Talbot <[email protected]> |
Date: | Mon, 29 May 2017 19:07:36 +0100 |
Cc: | [email protected] |
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References: | <[email protected]> |
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Yes. As you'll see in my original write up, I originally forgot that the peak of the fundamental sine component of a square wave is GREATER than the peak by a factor of 4 / pi and initially my PA delivered a lot more power (1.6 times) than it was supposed to. So if the square wave has a peak value of 1, its fundamental sine component has a peak value of 4/pi or around 1.27. The RMS of the resulting sine is SQRT(2) less than this giving a Peak square to RMS-sine ratio of 0.9.. If you specifye peak-peak of the square wave, a further factor of 2 applies, leading to the 0.45 ratio described before. Incidentally, this same ratio appears in that equation for flux in a magnetic code, V = 4.44.F.N.A.B The magic number 4.44 is actually SQRT(2) * pi and comes about from the same sort of sine to square transform. Andy On 29 May 2017 at 18:48, [email protected] <[email protected]> wrote:
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