FCC Technician Class Exam Study Guide - 2014-2018/Subelement T7 Group B
Common transmitter and receiver problems: symptoms of overload and overdrive; distortion; causes of interference; interference and consumer electronics; part 15 devices; over and under modulation; RF feedback; off frequency signals; fading and noise; problems with digital communications interfaces
The Question Pool
[edit | edit source]Question 1
[edit | edit source]- What can you do if you are told your FM handheld or mobile transceiver is over-deviating?
- A. Talk louder into the microphone
- B. Let the transceiver cool off
- C. Change to a higher power level
- D. Talk farther away from the microphone
The correct answer is D.
Question 2
[edit | edit source]- What would cause a broadcast AM or FM radio to receive an amateur radio transmission unintentionally?
- A. The receiver is unable to reject strong signals outside the AM or FM band
- B. The microphone gain of the transmitter is turned up too high
- C. The audio amplifier of the transmitter is overloaded
- D. The deviation of an FM transmitter is set too low
The correct answer is A.
Question 3
[edit | edit source]- Which of the following may be a cause of radio frequency interference?
- A. Fundamental overload
- B. Harmonics
- C. Spurious emissions
- D. All of these choices are correct
The correct answer is D.
Question 4
[edit | edit source]- Which of the following is a way to reduce or eliminate interference by an amateur transmitter to a nearby telephone?
- A. Put a filter on the amateur transmitter
- B. Reduce the microphone gain
- C. Reduce the SWR on the transmitter transmission line
- D. Put a RF filter on the telephone
The correct answer is D.
Question 5
[edit | edit source]- How can overload of a non-amateur radio or TV receiver by an amateur signal be reduced or eliminated?
- A. Block the amateur signal with a filter at the antenna input of the affected receiver
- B. Block the interfering signal with a filter on the amateur transmitter
- C. Switch the transmitter from FM to SSB
- D. Switch the transmitter to a narrow-band mode
The correct answer is A.
Question 6
[edit | edit source]- 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?
- A. 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
- B. Immediately turn off your transmitter and contact the nearest FCC office for assistance
- C. Tell them that your license gives you the right to transmit and nothing can be done to reduce the interference
- D. Install a harmonic doubler on the output of your transmitter and tune it until the interference is eliminated
The correct answer is A.
Question 7
[edit | edit source]- Which of the following may be useful in correcting a radio frequency interference problem?
- A. Snap-on ferrite chokes
- B. Low-pass and high-pass filters
- C. Band-reject and band-pass filters
- D. All of these choices are correct
The correct answer is D.
Question 8
[edit | edit source]- What should you do if something in a neighbor’s home is causing harmful interference to your amateur station?
- A. Work with your neighbor to identify the offending device
- B. Politely inform your neighbor about the rules that prohibit the use of devices which cause interference
- C. Check your station and make sure it meets the standards of good amateur practice
- D. All of these choices are correct
The correct answer is D.
Question 9
[edit | edit source]- What is a Part 15 device?
- A. An unlicensed device that may emit low powered radio signals on frequencies used by a licensed service
- B. A type of amateur radio that can legally be used in the citizen's band
- C. A device for long distance communications using special codes sanctioned by the International Amateur Radio Union
- D. A type of test set used to determine whether a transmitter is in compliance with FCC regulation 91.15
The correct answer is A
Question 10
[edit | edit source]- What might be the problem if you receive a report that your audio signal through the repeater is distorted or unintelligible?
- A. Your transmitter may be slightly off frequency
- B. Your batteries may be running low
- C. You could be in a bad location
- D. All of these choices are correct
The correct answer is D.
Question 11
[edit | edit source]- What is a symptom of RF feedback in a transmitter or transceiver?
- A. Excessive SWR at the antenna connection
- B. The transmitter will not stay on the desired frequency
- C. Reports of garbled, distorted, or unintelligible transmissions
- D. Frequent blowing of power supply fuses
The correct answer is C.
Question 12
[edit | edit source]- What might be the first step to resolve cable TV interference from your ham radio transmission?
- A. Add a low pass filter to the TV antenna input
- B. Add a high pass filter to the TV antenna input
- C. Add a preamplifier to the TV antenna input
- D. Be sure all TV coaxial connectors are installed properly
The correct answer is D.