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VE2HAR > MT63 13.03.05 16:02l 54 Lines 1450 Bytes #-7305 (0) @ WW
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Read: GUEST
Subj: Re: [MT63] Re: Crest Factors
Path: DB0FHN<DB0CL<DB0PDF<DB0SM<DB0EA<DB0RES<DK0WUE<7M3TJZ<ON0AR<VA2HAR<
VE2HAR
Sent: 050313/1442z @:VE2HAR.#MTL.QC.CAN.NOAM Laval #:42119 $:3420sentto
On Sun, 2005-03-13 at 04:18, karl larsen wrote:
> We want to know what the POWER out is when MT63 is not being
> modulated by data to the POWER out maximum when it is. It is a ratio of
> POWER to POWER, not rms to peak voltage.
No Karl. You are wrong.
We want to know the difference of the peak power and average power
of a modulated MT63 waveform *). This is called the crest factor. In
the case of MT63 the data doesn't play very big role in the crest
factor. The crest factor is slightly lower when MT63 is idling, but
the difference isn't big.
*) If you do the math, you'll notice that this is exactly the same
thing as peak voltage to rms-voltage ratio as long as the load
impedance stays constant.
--
Tomi Manninen / OH2BNS / KP20JF74
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