FCC Technician Class Exam Study Guide - 2014-2018/Subelement T4 Group B

Operating controls: tuning; use of filters; squelch function; AGC; repeater offset; memory channels

Question 1

 * What may happen if a transmitter is operated with the microphone gain set too high?
 * A. The output power might be too high
 * B. The output signal might become distorted
 * C. The frequency might vary
 * D. The SWR might increase

The correct answer is B.

Question 2

 * Which of the following can be used to enter the operating frequency on a modern transceiver?
 * A. The keypad or VFO knob
 * B. The CTCSS or DTMF encoder
 * C. The Automatic Frequency Control
 * D. All of these choices are correct

The correct answer is A.

Question 3

 * What is the purpose of the squelch control on a transceiver?
 * A. To set the highest level of volume desired
 * B. To set the transmitter power level
 * C. To adjust the automatic gain control
 * D. To mute receiver output noise when no signal is being received

The correct answer is D.

Question 4

 * What is a way to enable quick access to a favorite frequency on your transceiver?
 * A. Enable the CTCSS tones
 * B. Store the frequency in a memory channel
 * C. Disable the CTCSS tones
 * D. Use the scan mode to select the desired frequency

The correct answer is B.

Question 5

 * Which of the following would reduce ignition interference to a receiver?
 * A. Change frequency slightly
 * B. Decrease the squelch setting
 * C. Turn on the noise blanker
 * D. Use the RIT control

The correct answer is C.

Question 6

 * Which of the following controls could be used if the voice pitch of a single-sideband signal seems too high or low?
 * A. The AGC or limiter
 * B. The bandwidth selection
 * C. The tone squelch
 * D. The receiver RIT or clarifier

The correct answer is D.

Question 7

 * What does the term "RIT" mean?
 * A. Receiver Input Tone
 * B. Receiver Incremental Tuning
 * C. Rectifier Inverter Test
 * D. Remote Input Transmitter

The correct answer is B.

Question 8

 * What is the advantage of having multiple receive bandwidth choices on a multimode transceiver?
 * A. Permits monitoring several modes at once
 * B. Permits noise or interference reduction by selecting a bandwidth matching the mode
 * C. Increases the number of frequencies that can be stored in memory
 * D. Increases the amount of offset between receive and transmit frequencies

The correct answer is B.

Question 9

 * Which of the following is an appropriate receive filter bandwidth to select in order to minimize noise and interference for SSB reception?
 * A. 500 Hz
 * B. 1000 Hz
 * C. 2400 Hz
 * D. 5000 Hz

The correct answer is C.

Question 10

 * Which of the following is an appropriate receive filter bandwidth to select in order to minimize noise and interference for CW reception?
 * A. 500 Hz
 * B. 1000 Hz
 * C. 2400 Hz
 * D. 5000 Hz

The correct answer is A.

Question 11

 * Which of the following describes the common meaning of the term "repeater offset"?
 * A. The distance between the repeater's transmit and receive antennas
 * B. The time delay before the repeater timer resets
 * C. The difference between the repeater's transmit and receive frequencies
 * D. Matching the antenna impedance to the feed line impedance

The correct answer is C.

Question 12

 * What is the function of automatic gain control or AGC?
 * A. To keep received audio relatively constant
 * B. To protect an antenna from lightning
 * C. To eliminate RF on the station cabling
 * D. An asymmetric goniometer control used for antenna matching

The correct answer is A.