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Ham Radio Technician License (2018-2022) > Sub-Element T7 Station equipment: common transmitter and receiver problems, antenna measurements, troubleshooting, basic repair & testing [4 Exam Questions] > Flashcards

Sub-Element T7 Station equipment: common transmitter and receiver problems, antenna measurements, troubleshooting, basic repair & testing [4 Exam Questions] Flashcards

1
Q

Which term describes the ability of a receiver to detect the presence of a signal?

A

Sensitivity

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2
Q

What is a transceiver?

A

A unit combining the functions of a transmitter and a receiver

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3
Q

Which of the following is used to convert a radio signal from one frequency to another?

A

Mixer

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4
Q

Which term describes the ability of a receiver to discriminate between multiple signals?

A

Selectivity

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5
Q

What is the name of a circuit that generates a signal at a specific frequency?

A

Oscillator

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6
Q

What device converts the RF input and output of a transceiver to another band?

A

Transverter

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7
Q

What is meant by “PTT”?

A

The push-to-talk function that switches between receive and transmit

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8
Q

Which of the following describes combining speech with an RF carrier signal?

A

Modulation

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9
Q

What is the function of the SSB/CW-FM switch on a VHF power amplifier?

A

Set the amplifier for proper operation in the selected mode

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10
Q

What device increases the low-power output from a handheld transceiver?

A

An RF power amplifier

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11
Q

Where is an RF preamplifier installed?

A

Between the antenna and receiver

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12
Q

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

A

Talk farther away from the microphone

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13
Q

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

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14
Q

Which of the following can cause radio frequency interference?

A

All of these choices are correct

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15
Q

Which of the following is a way to reduce or eliminate interference from an amateur transmitter to a nearby telephone?

A

Put an RF filter on the telephone

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16
Q

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

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17
Q

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

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18
Q

Which of the following can reduce overload to a VHF transceiver from a nearby FM broadcast station?

A

Band-reject filter

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19
Q

What should you do if something in a neighbor’s home is causing harmful interference to your amateur station?

A

All of these choices are correct

20
Q

What is a Part 15 device?

A

An unlicensed device that may emit low-powered radio signals on frequencies used by a licensed service

21
Q

What might be a problem if you receive a report that your audio signal through the repeater is distorted or unintelligible?

A

All of these choices are correct

22
Q

What is a symptom of RF feedback in a transmitter or transceiver?

A

Reports of garbled, distorted, or unintelligible voice transmissions

23
Q

What should be the first step to resolve cable TV interference from your ham radio transmission?

A

Be sure all TV coaxial connectors are installed properly

24
Q

What is the primary purpose of a dummy load?

A

To prevent transmitting signals over the air when making tests

25
Q

Which of the following instruments can be used to determine if an antenna is resonant at the desired operating frequency?

A

An antenna analyzer

26
Q

What, in general terms, is standing wave ratio (SWR)?

A

A measure of how well a load is matched to a transmission line

27
Q

What reading on an SWR meter indicates a perfect impedance match between the antenna and the feed line?

A

1 to 1

28
Q

Why do most solid-state amateur radio transmitters reduce output power as SWR increases?

A

To protect the output amplifier transistors

29
Q

What does an SWR reading of 4:1 indicate?

A

Impedance mismatch

30
Q

What happens to power lost in a feed line?

A

It is converted into heat

31
Q

What instrument other than an SWR meter could you use to determine if a feed line and antenna are properly matched?

A

Directional wattmeter

32
Q

Which of the following is the most common cause for failure of coaxial cables?

A

Moisture contamination

33
Q

Why should the outer jacket of coaxial cable be resistant to ultraviolet light?

A

Ultraviolet light can damage the jacket and allow water to enter the cable

34
Q

What is a disadvantage of air core coaxial cable when compared to foam or solid dielectric types?

A

It requires special techniques to prevent water absorption

35
Q

What does a dummy load consist of?

A

A non-inductive resistor and a heat sink

36
Q

Which instrument would you use to measure electric potential or electromotive force?

A

A voltmeter

37
Q

What is the correct way to connect a voltmeter to a circuit?

A

In parallel with the circuit

38
Q

How is a simple ammeter connected to a circuit?

A

In series with the circuit

39
Q

Which instrument is used to measure electric current?

A

An ammeter

40
Q

What instrument is used to measure resistance?

A

An ohmmeter

41
Q

Which of the following might damage a multimeter?

A

Attempting to measure voltage when using the resistance setting

42
Q

Which of the following measurements are commonly made using a multimeter?

A

Voltage and resistance

43
Q

Which of the following types of solder is best for radio and electronic use?

A

Rosin-core solder

44
Q

What is the characteristic appearance of a cold solder joint?

A

A grainy or dull surface

45
Q

What is probably happening when an ohmmeter, connected across an unpowered circuit, initially indicates a low resistance and then shows increasing resistance with time?

A

The circuit contains a large capacitor

46
Q

Which of the following precautions should be taken when measuring circuit resistance with an ohmmeter?

A

Ensure that the circuit is not powered

47
Q

Which of the following precautions should be taken when measuring high voltages with a voltmeter?

A

Ensure that the voltmeter and leads are rated for use at the voltages to be measured

Ham Radio Technician License (2018-2022) (10 decks)

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