49 lines
1.5 KiB
Plaintext
49 lines
1.5 KiB
Plaintext
= PEP =
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Peak envelope delivery or PEP is the average power of onc ecomplete RF cycle at
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the peak of the singal envelope. It is important to note that it IS NOT the
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power at the peak of an RF cycle during a peak of the signal's envelope.
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PEP is used as it is a convient way to portray the max power of an amplitude
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modulated signal.
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== Calcuation ==
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To calculate PEP, you need to know the [[Impedance]] and [[AC#RMS|RMS]].
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You can also calcuate it using the Peak Envelope Power (PEV), or the peak
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amplitude of one side band, or the Peak to Peak voltage (V,,p-p,,). V,,p-p,,
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is found by doubling the PEV, or taking the max voltage of both sidebands.
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PEP is euqal to the average power if an amplitude-modulated signal is not
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modulated. This is the case when modulation is removed from an [[Modulation#AM]] signal, or
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with [[Modulation#CW]] keying. Because [[Modulation#FM]] signals are constant
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power, the PEP is always equal to average power for FM signals. In other words,
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if an average reading Wattmeter reads 1060W output when CW keying, then your
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PEP output is also 1060W.
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The way to calculate it is shown below
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PEP = V,,RMS,,^2 / R
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PEP = ((0.707 * V,,p-p,,) / 2)^2 / R
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PEP = (PEV * 0.707)^2 / R
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Where R is the loads [[Impedance]]. For example,
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Peak envelope voltage (PEV) is 50V across a 50ohm load. PEP is
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PEP = (50 * 0.707)^2 / 50
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PEP = 25W
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A 50ohm load is dissipating a 1200W PEP, the RMS voltage is
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1200 = V,,RMS,,^2 / 50
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60000 = V,,RMS,,^2
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244.948 = V,,RMS,,
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