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  #1  
Old 10-13-2009, 11:24 AM
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Default PEAK & PEP


WHAT IS THE DIFFERENCE?
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Old 10-13-2009, 12:14 PM
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the only difference i know is peak has a a in it and pep dont..
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Old 10-13-2009, 02:28 PM
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Its the same thing PEP stands for (P)eak (E)nelope (P)ower as you can see Peak is also short for (Peak) Envelope Power
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Old 10-13-2009, 02:42 PM
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Old 10-13-2009, 03:25 PM
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Now there is also a difference between Peak power and True Peak Power. Peak power is always used to get accurate SSB power readings but......its not going to show (True) Peak Power unless the meter states it does.

Easiest way to tell a true Peak reading meter is they have to run on a power source for peak readings rather it be 9 volt battery of wall wart transformer I cant remember exactly what the rule is on measurement between peak and true peak I think it was a standard peak will give a certain percentage of the total peak and thats where True PEP comes in to give you a total reading.

Im thinking Standard PEP gave 30% of the total PEP which obviously wouldnt be a true PEP reading. please someone correct me if Im off with the 30%
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Last edited by TonyV225; 10-13-2009 at 03:40 PM.
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Old 10-13-2009, 03:30 PM
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Thanks..
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Old 10-13-2009, 04:18 PM
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PEAK power can only be determined for waveforms that are relatively constant, such as power lines at 60 Hz. With purely sinusoidal, constant level waveforms, the math is a snap - and you can easily measure it with a calibrated oscilloscope.

PEAK ENVELOPE POWER (PEP) is a little more complex, since it involves the waveform as modulated by a human voice or by a multitone audio signal. RF wattmeters typically measure average (not RMS) power. There are some meters that have a "PEAK" position on their switches, but these are NOT reliable in that switch position.

Meters that will accurately read PEP must have active circuitry to analyze the RF waveform, do the math, and display it on the instrument's face. In order for the instrument to do that, it needs to have either an internal battery, or an external power source, to provide the power for that active circuitry.

Some MFJ meters (and others, I suspect) have wallwarts available that will power the lights for the meter face. Check the specifications carefully and ignore switch position markings. You're the buyer, so beware.
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Old 10-13-2009, 04:56 PM
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peak has a k in it also and pep dont

Quote:
Originally Posted by Splash1 View Post
the only difference i know is peak has a a in it and pep dont..
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Old 10-13-2009, 06:44 PM
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Quote:
Originally Posted by TonyV225 View Post
Its the same thing PEP stands for (P)eak (E)nelope (P)ower as you can see Peak is also short for (Peak) Envelope Power
Viewing a pure symmetrical sine wave (with no dc bias) on an oscilloscope, the total vertical displacement (maximum positive TO maximum negative) is the PEAK to PEAK voltage. In the same symmetrical waveform, the maximum positive OR maximum negative excursion is called the PEAK voltage, and it is one half of the peak to peak reading. The RMS value is equal to the peak value times 0.707. For example, home electricity is 117V rms, 165.5v peak , and 331v peak to peak.

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Old 10-13-2009, 08:30 PM
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and dont forget guys that a meter is still an average way of seeing the watts. radio waves travel as fast as the speed of light 186,000 miles per second. as well as the energy traveling through the coax. to see real watts you have to use a scope and a spectrum analizer because the energy moves way to fast for any analog meter to understand what frequency is going into the meter. then you have to have a powered meter to really see good peaks. but really who the hell has the money for all that bull. lol
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