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This any better Doc.?


Peak envelope power of a radio transmitter : The average power supplied to the antenna transmission line by a transmitter during one radio frequency cycle at the crest of the modulation envelope taken under normal operating conditions.


Peak envelope power, PEP


 For some applications another form of RF power measurement is required. Called peak envelope power, PEP, it is used to measure the power of some varying waveforms.

 There are many instances where a power measurement that takes the peak of the envelope is needed. Many digitally modulated waveforms may require this, and also transmissions such as AM and Single Sideband may also need this type of RF power measurement.

 The envelope power is measured by making the averaging time greater than the period of the modulating waveform, i.e. 1/fm where fm is the maximum frequency component of the modulation waveform.

 This means that the averaging time of the RF power measurement must fall within a window:

 

  • It must be large when compared to the period of the highest modulation frequency.
  • It must be small compared to the period of the carrier waveform

The peak envelope power is therefore the peak value obtained using this method.





With PEP measurements, time (sample rate), is a factor and that time "window" is influenced by the highest frequency of the modulating signal source.


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