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Amateur Radio - Technician > Technician Subelement T4 > Flashcards

Technician Subelement T4 Flashcards

1
Q

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

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 choices are correct

A

All of these choices are correct

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2
Q

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

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

A

All of these choices are correct

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3
Q

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

A. To avoid voltage falling below that needed for proper operation
B. To provide a good counterpoise for the antenna
C. To avoid RF interference
D. All of these choices are correct

A

To avoid voltage falling below that needed for proper operation

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4
Q

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

A. Headphone output
B. Mute
C. Microphone or line input
D. PCI or SDI

A

Microphone or line input

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5
Q

What is the proper location for an external SWR meter?

A. In series with the feed line, between the transmitter and antenna
B. In series with the station’s ground
C. In parallel with the push-to-talk line and the antenna
D. In series with the power supply cable, as close as possible to the radio

A

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

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6
Q

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

A. Receive and transmit mode, status, and location
B. Antenna and RF power
C. Receive audio, transmit audio, and push-to-talk (PTT)
D. NMEA GPS location and DC power

A

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

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7
Q

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

A. The sound card communicates between the computer CPU and the video display
B. The sound card records the audio frequency for video display
C. The sound card provides audio to the radio’s microphone input and converts received audio to digital form
D. All of these choices are correct

A

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

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8
Q

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

A. Round stranded wire
B. Round copper-clad steel wire
C. Twisted-pair cable
D. Flat strap

A

Flat strap

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9
Q

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

A. Band-pass filter
B. Low-pass filter
C. Preamplifier
D. Ferrite choke

A

Ferrite choke

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10
Q

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

A. The ignition system
B. The alternator
C. The electric fuel pump
D. Anti-lock braking system controllers

A

The alternator

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11
Q

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

A. At the battery or engine block ground strap
B. At the antenna mount
C. To any metal part of the vehicle
D. Through the transceiver’s mounting bracket

A

At the battery or engine block ground strap

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12
Q

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

A

The output signal might become distorted

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13
Q

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

A

The keypad or VFO knob

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14
Q

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

A

To mute receiver output noise when no signal is being received

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15
Q

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

A

Store the frequency in a memory channel

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16
Q

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

A

Turn on the noise blanker

17
Q

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

A

The receiver RIT or clarifier

18
Q

What does the term “RIT” mean?

A. Receiver Input Tone
B. Receiver Incremental Tuning
C. Rectifier Inverter Test
D. Remote Input Transmitter

A

Receiver Incremental Tuning

19
Q

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

A

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

20
Q

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

A. 500 Hz
B. 1000 Hz
C. 2400 Hz
D. 5000 Hz

A

2400 Hz

21
Q

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

A. 500 Hz
B. 1000 Hz
C. 2400 Hz
D. 5000 Hz

A

500 Hz

22
Q

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

A

To keep received audio relatively constant

23
Q

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

A. Squelch
B. Noise blanker
C. Notch filter
D. All of these choices are correct

A

Noise blanker

24
Q

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

A. To check incoming signal deviation
B. To prevent interference to nearby repeaters
C. To scan through a range of frequencies to check for activity
D. To check for messages left on a digital bulletin board

A

To scan through a range of frequencies to check for activity

Amateur Radio - Technician (10 decks)

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