Topic G4B Quick Review Audio


What item of test equipment contains horizontal and vertical channel amplifiers?

  1. An ohmmeter
  2. A signal generator
  3. An ammeter
  4. An oscilloscope


Which of the following is an advantage of an oscilloscope versus a digital voltmeter?

  1. An oscilloscope uses less power
  2. Complex impedances can be easily measured
  3. Input impedance is much lower
  4. Complex waveforms can be measured


Which of the following is the best instrument to use when checking the keying waveform of a CW transmitter?

  1. An oscilloscope
  2. A field strength meter
  3. A sidetone monitor
  4. A wavemeter


What signal source is connected to the vertical input of an oscilloscope when checking the RF envelope pattern of a transmitted signal?

  1. The local oscillator of the transmitter
  2. An external RF oscillator
  3. The transmitter balanced mixer output
  4. The attenuated RF output of the transmitter


Why is high input impedance desirable for a voltmeter?

  1. It improves the frequency response
  2. It decreases battery consumption in the meter
  3. It improves the resolution of the readings
  4. It decreases the loading on circuits being measured


What is an advantage of a digital voltmeter as compared to an analog voltmeter?

  1. Better for measuring computer circuits
  2. Better for RF measurements
  3. Better precision for most uses
  4. Faster response


What signals are used to conduct a two-tone test?

  1. Two audio signals of the same frequency shifted 90 degrees
  2. Two non-harmonically related audio signals
  3. Two swept frequency tones
  4. Two audio frequency range square wave signals of equal amplitude


Which of the following instruments may be used to monitor relative RF output when making antenna and transmitter adjustments?

  1. A field strength meter
  2. An antenna noise bridge
  3. A multimeter
  4. A Q meter


Which of the following can be determined with a field strength meter?

  1. The radiation resistance of an antenna
  2. The radiation pattern of an antenna
  3. The presence and amount of phase distortion of a transmitter
  4. The presence and amount of amplitude distortion of a transmitter


Which of the following can be determined with a directional wattmeter?

  1. Standing wave ratio
  2. Antenna front-to-back ratio
  3. RF interference
  4. Radio wave propagation


Which of the following must be connected to an antenna analyzer when it is being used for SWR measurements?

  1. Receiver
  2. Transmitter
  3. Antenna and feed line
  4. All these choices are correct


What problem can occur when making measurements on an antenna system with an antenna analyzer?

  1. Permanent damage to the analyzer may occur if it is operated into a high SWR
  2. Strong signals from nearby transmitters can affect the accuracy of measurements
  3. The analyzer can be damaged if measurements outside the ham bands are attempted
  4. Connecting the analyzer to an antenna can cause it to absorb harmonics


What is a use for an antenna analyzer other than measuring the SWR of an antenna system?

  1. Measuring the front-to-back ratio of an antenna
  2. Measuring the turns ratio of a power transformer
  3. Determining the impedance of coaxial cable
  4. Determining the gain of a directional antenna


What is an instance in which the use of an instrument with analog readout may be preferred over an instrument with digital readout?

  1. When testing logic circuits
  2. When high precision is desired
  3. When measuring the frequency of an oscillator
  4. When adjusting tuned circuits


What type of transmitter performance does a two-tone test analyze?

  1. Linearity
  2. Percentage of suppression of carrier and undesired sideband for SSB
  3. Percentage of frequency modulation
  4. Percentage of carrier phase shift