SUBELEMENT T4 - Amateur radio practices and station set-up – [2 Exam Questions - 2 Groups]

Question 1

T4A01 (D)

What must be considered to determine the minimum current capacity needed for a transceiver’s power supply?

Answer 1

A. Efficiency of the transmitter at full power output
B. Receiver and control circuit power
C. Power supply regulation and heat dissipation
D. All of these are correct

Question 2

T4A02 (D)

How might a computer be used as part of an amateur radio station?

Answer 2

A. For logging contacts and contact information
B. For sending and/or receiving CW
C. For generating and decoding digital signals
D. All of these choices are correct

Question 3

T4A03 (A)

Why should wiring between the power source and radio be heavy-gauge wire and kept as short as possible?

Answer 3

A. To avoid voltage falling below that needed for proper operation

Question 4

T4A04 (C)

Which computer sound card port is connected to a transceiver’s headphone or speaker output for operating digital modes?

Answer 4

C. Microphone or line input

Question 5

T4A05 (A)

What is the proper location for an external SWR meter?

Answer 5

A. In series with the feed line, between the transmitter and antenna

Question 6

T4A06 (C)

Which of the following connections might be used between a voice transceiver and a computer for digital operation?

Answer 6

C. Receive audio, transmit audio, and push-to-talk (PTT)

Question 7

T4A07 (C)

How is a computer’s sound card used when conducting digital communications?

Answer 7

C. The sound card provides audio to the radio’s microphone input and converts received audio to digital form

Question 8

T4A08 (D)

Which of the following conductors provides the lowest impedance to RF signals?

Answer 8

D. Flat Strap

Question 9

T4A09 (D)

Which of the following could you use to cure distorted audio caused by RF current on the shield of a microphone cable?

Answer 9

D. Ferrite choke

Question 10

T4A10 (B)

What is the source of a high-pitched whine that varies with engine speed in a mobile transceiver’s receive audio?

Answer 10

B. The alternator

Question 11

T4A11 (A)

Where should the negative return connection of a mobile transceiver’s power cable be connected?

Answer 11

A. At the battery or engine block ground strap

Question 12

T4B01 (B)

What may happen if a transmitter is operated with the microphone gain set too high?

Answer 12

B. The output signal might become distorted

Question 13

T4B02 (A)

Which of the following can be used to enter the operating frequency on a modern transceiver?

Answer 13

A. The keypad or VFO knob

Question 14

T4B03 (D)

What is the purpose of the squelch control on a transceiver?

Answer 14

D. To mute receiver output noise when no signal is being received

Question 15

T4B04 (B)

What is a way to enable quick access to a favorite frequency on your transceiver?

Answer 15

B. Store the frequency in a memory channel

Question 16

T4B05 (C)

Which of the following would reduce ignition interference to a receiver?

Answer 16

C. Turn on the noise blanker

Question 17

T4B06 (D)

Which of the following controls could be used if the voice pitch of a single-sideband signal seems too high or low?

Answer 17

D. The receiver RIT or clarifier

Question 18

T4B07 (B)

What does the term “RIT” mean?

Answer 18

B. Receiver Incremental Tuning

Question 19

T4B08 (B)

What is the advantage of having multiple receive bandwidth choices on a multimode transceiver?

Answer 19

B. Permits noise or interference reduction by selecting a bandwidth matching the mode

Question 20

T4B09 (C)
Which of the following is an appropriate receive filter bandwidth for minimizing noise and interference for SSB reception?

Answer 20

C. 2400 Hz

Question 21

T4B10 (A)
Which of the following is an appropriate receive filter bandwidth for minimizing noise and interference for CW reception?

Answer 21

A. 500 Hz

Question 22

T4B11 (C)

What is the common meaning of the term “repeater offset”?

Answer 22

C. The difference between the repeater’s transmit and receive frequencies

Question 23

T4B12 (A)

What is the function of automatic gain control, or AGC?

Answer 23

A. To keep received audio relatively constant

Question 24

T4B13 (B)

Which of the following could be used to remove power line noise or ignition noise?

Answer 24

B. Noise blanker

Question 25

T4B14 (C)

Which of the following is a use for the scanning function of an FM transceiver?

Answer 25

C. To scan through a range of frequencies to check for activity