E4A01

How does a spectrum analyzer differ from a conventional oscilloscope?

  1. A spectrum analyzer displays signals in the frequency domain; an oscilloscope displays signals in the time domain

E4A02

Which of the following parameters would a typical spectrum analyzer display on the horizontal axis?

  1. Frequency

E4A03

Which of the following parameters would a typical spectrum analyzer display on the vertical axis?

  1. Amplitude

E4A04

Which of the following test instruments is used to display spurious signals from a radio transmitter?

  1. A spectrum analyzer

E4A05

Which of the following test instruments is used to display intermodulation distortion products in an SSB transmission?

  1. A spectrum analyzer

E4A06

Which of the following could be determined with a spectrum analyzer?

  1. A. The degree of isolation between the input and output ports of a 2 meter duplexer
  2. B. Whether a crystal is operating on its fundamental or overtone frequency
  3. C. The spectral output of a transmitter
  4. D. All of these choices are correct

E4A07

Which of the following is an advantage of using an antenna analyzer vs. a SWR bridge to measure antenna SWR?

  1. Antenna analyzers typically do not need an external RF source

E4A08

Which of the following instruments would be best for measuring the SWR of a beam antenna?

  1. An antenna analyzer

E4A09

Which of the following is most important when adjusting PSK31 transmitting levels?

  1. ALC level

E4A10

Which of the following is a useful test for a functioning NPN transistor in an active circuit where the transistor should be biased "on" ?

  1. Measure base-to-emitter voltage with a voltmeter; it should be approximately 0.6 to 0.7 volts

E4A11

Which of the following test instruments can be used to indicate pulse conditions in a digital logic circuit?

  1. A logic probe

E4A12

Which of the following procedures is an important precaution to follow when connecting a spectrum analyzer to a transmitter output?

  1. Attenuate the transmitter output going to the spectrum analyzer

 

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