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Subelement 3

Measurements

Section 3-02

PEP, PEP relative to average power, PEP relative to voltage across load

The power supplied to the antenna transmission line by a transmitter during an RF cycle at the highest crest of the modulation envelope is known as:

  • Correct Answer
    peak-envelope power
  • mean power
  • carrier power
  • full power
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To compute one of the following, multiply the peak-envelope voltage by 0.707 to obtain the RMS value, square the result and divide by the load resistance. Which is the correct answer?

  • PIV
  • ERP
  • Correct Answer
    PEP
  • power factor
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Peak-Envelope Power (PEP) for SSB transmission is:

  • Correct Answer
    Peak-Envelope Voltage (PEV) multiplied by 0.707, squared and divided by the load resistance
  • peak-voltage multiplied by peak current
  • equal to the rms power
  • a hypothetical measurement
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The formula to be used to calculate the power output of a transmitter into a resistor load using a voltmeter is:

  • P = EI/R
  • Correct Answer
    P = E^2/R
  • P = EI cos 0
  • P = IR
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How is the output Peak-Envelope Power of a transmitter calculated, if an oscilloscope is used to measure the Peak-Envelope Voltage across a dummy resistive load? PEP = Peak-Envelope — Power PEV = Peak-Envelope Voltage — Vp = peak-voltage — RL = load resistance

  • Correct Answer
    PEP = [(0.707 PEV)(0.707 PEV)] / RL
  • PEP = [(Vp)(Vp)] / (RL)
  • PEP = (Vp)(Vp)(RL)
  • PEP = [(1.414 PEV)(1.414 PEV)] / RL
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What is the output PEP from a transmitter if an oscilloscope measures 200 volts peak-to-peak across a 50-ohm dummy load connected to the transmitter output?

  • 400 watts
  • Correct Answer
    100 watts
  • 1000 watts
  • 200 watts
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What is the output PEP from a transmitter if an oscilloscope measures 500 volts peak-to-peak across a 50-ohm dummy load connected to the transmitter output?

  • 1250 watts
  • Correct Answer
    625 watts
  • 2500 watts
  • 500 watts
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What is the output PEP of an unmodulated carrier transmitter if a wattmeter connected to the transmitter output indicates an average reading of 1060 watts?

  • 2120 watts
  • 1500 watts
  • Correct Answer
    1060 watts
  • 530 watts
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What is the output PEP from a transmitter, if an oscilloscope measures 400 volts peak-to-peak across a 50 ohm dummy load connected to the transmitter output?

  • Correct Answer
    400 watts
  • 200 watts
  • 600 watts
  • 1000 watts
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What is the output PEP from a transmitter, if an oscilloscope measures 800 volts peak-to-peak across a 50 ohm dummy load connected to the transmitter output?

  • 800 watts
  • Correct Answer
    1600 watts
  • 6400 watts
  • 3200 watts
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An oscilloscope measures 500 volts peak-to-peak across a 50 ohm dummy load connected to the transmitter output during unmodulated carrier conditions. What would an average-reading power meter indicate under the same transmitter conditions?

  • 427.5 watts
  • 884 watts
  • 442 watts
  • Correct Answer
    625 watts
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