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VE2HAR > MT63 13.03.05 00:00l 60 Lines 1734 Bytes #-7309 (0) @ WW
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Read: GUEST
Subj: Re: [MT63] Re: Crest Factors
Path: DB0FHN<DB0RGB<DB0MRW<DB0WUE<DK0WUE<7M3TJZ<ON0AR<VA2HAR<VE2HAR
Sent: 050312/2300z @:VE2HAR.#MTL.QC.CAN.NOAM Laval #:41849 $:23458sentto
At 03:57 PM 3/12/2005, you wrote:
>This term "Crest Factor" is a new one on me. I admit to doing my
>Postgraduate School work way back shortly after WW2. I see Mark Miller has
>clarified the term to be peak to RMS. That appears to be akin what we SSB
>pioneers called the "Peak to Average" power ratio.
I agree that peak to RMS voltage ratio is the same as the peak to average
power ratio when stated in dB. I looked at my original findings. Note that
peak power is not the same as PEP.
My average power when using MT63 was 7 Watts as read on the Watt
meter. This is 18.7 Vrms. The scope measured 60 Volts peak. 60/18.7 is
3.2 which is the crest factor.
Using only power I had 7 Watts average and 60 volts showing on the
scope. 60 volts indicates 72 watts peak. 72/7 = 10.3. The square root of
10.3 is 3.2 which is the crest factor.
Using dB, 20 log of 3.2 is 10.1 dB. 10 log of 10.3 is 10.1 dB. Everything
is the same.
73,
Mark N5RFX
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