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Subel. T7
11 questions
Subelement T7

PRACTICAL CIRCUITS

Section T7B

Symptoms, causes, and cures of common transmitter and receiver problems: overload and overdrive, distortion, interference and consumer electronics, RF feedback

What can you do if you are told your FM handheld or mobile transceiver is over-deviating?

  • Talk louder into the microphone
  • Let the transceiver cool off
  • Change to a higher power level
  • Correct Answer
    Talk farther away from the microphone
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What would cause a broadcast AM or FM radio to receive an amateur radio transmission unintentionally?

  • Correct Answer
    The receiver is unable to reject strong signals outside the AM or FM band
  • The microphone gain of the transmitter is turned up too high
  • The audio amplifier of the transmitter is overloaded
  • The deviation of an FM transmitter is set too low
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Which of the following can cause radio frequency interference?

  • Fundamental overload
  • Harmonics
  • Spurious emissions
  • Correct Answer
    All these choices are correct
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Which of the following might be the cause of low RF power output from a solid-state transceiver?

  • Poor amplifier noise figure
  • Poor amplifier linearity
  • Low SWR
  • Correct Answer
    High SWR
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Which of the following might reduce interference by an amateur station to a non-amateur over-the-air radio receiver?

  • Correct Answer
    Block the amateur signal with a filter at the antenna input of the affected receiver
  • Block the interfering signal with a filter on the amateur transmitter
  • Switch the transmitter from FM to SSB
  • Switch the transmitter to a narrow-band mode
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Which of the following actions should you take if a neighbor tells you that your station’s transmissions are interfering with their radio or TV reception?

  • Correct Answer
    Make sure that your station is functioning properly and that it does not cause interference to your own radio or television when it is tuned to the same channel
  • Immediately turn off your transmitter and contact the nearest FCC office for assistance
  • Install a harmonic doubler on the output of your transmitter and tune it until the interference is eliminated
  • All these choices are correct
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Which of the following can reduce interference to a 2-meter band transceiver from a nearby commercial FM station?

  • Installing an RF preamplifier
  • Using double-shielded coaxial cable
  • Installing bypass capacitors on the microphone cable
  • Correct Answer
    Installing a band-reject filter
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What should you do if something in a neighbor’s home is causing harmful interference to your amateur station?

  • Work with your neighbor to identify the offending device
  • Politely inform your neighbor that FCC rules prohibit the use of devices that cause interference
  • Make sure your station meets the standards of good amateur practice
  • Correct Answer
    All these choices are correct
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What should be the first step to resolve non-fiber optic cable TV interference caused by your amateur radio transmission?

  • Add a low-pass filter to the TV antenna input
  • Add a high-pass filter to the TV antenna input
  • Add a preamplifier to the TV antenna input
  • Correct Answer
    Be sure all TV feed line coaxial connectors are installed properly
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What might be a problem if you receive a report that your audio signal through an FM repeater is distorted or unintelligible?

  • Your transmitter is slightly off frequency
  • You are speaking too loudly or too close to the microphone
  • You are in a bad location
  • Correct Answer
    All these choices are correct
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Which of the following can eliminate distorted voice transmissions?

  • Adding extra feedline to the antenna to lower SWR
  • Turning the radio on and off to reset the computer-controlled circuitry
  • Correct Answer
    Adding a clip-on ferrite “choke” to the microphone cable to prevent the transmitted signal from feeding back into the transmitter
  • Turning the squelch control fully clockwise to prevent the transmitted signal from triggering the squelch circuit
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