Ham Radio Technician Flashcards: 90 Core Concepts for 2026-2030

このデッキのカード

1. カード 1

   質問

   Which component is commonly used as an adjustable volume control?

   回答

   A potentiometer. It is a variable resistor with a movable contact.

2. カード 2

   質問

   Which U.S. agency regulates and enforces the Amateur Radio Service rules?

   回答

   The Federal Communications Commission (FCC). It administers the rules that govern U.S. amateur stations.

3. カード 3

   質問

   Which common voice mode uses less bandwidth: SSB or FM?

   回答

   SSB uses less bandwidth. This makes it well suited to crowded HF spectrum.

4. カード 4

   質問

   What determines a radio wave’s polarization?

   回答

   The orientation of its electric field.

5. カード 5

   質問

   What power-supply rating is typical for a 50-watt mobile FM transceiver?

   回答

   About 13.8 volts at 12 amperes. The current rating must cover the radio’s transmit demand.

6. カード 6

   質問

   What is an amateur band plan?

   回答

   A voluntary guide for using different modes and activities within a band. It supplements—not replaces—FCC frequency privileges.

7. カード 7

   質問

   How fast does a radio wave travel through free space?

   回答

   At the speed of light. Radio waves are electromagnetic waves.

8. カード 8

   質問

   What is a fuse designed to do during an electrical overload?

   回答

   Open the circuit and remove power. It protects wiring and equipment from excessive current.

9. カード 9

   質問

   What electrical quantity causes electrons to flow in a circuit?

   回答

   Voltage, or electrical potential difference. Current is the resulting flow of charge.

10. カード 10

    質問

    When the station licensee and control operator are different people, who is responsible for proper station operation?

    回答

    Both are equally responsible. The station licensee and the control operator share responsibility for compliance.

11. カード 11

    質問

    Which two major radio functions are combined inside a transceiver?

    回答

    A transmitter and a receiver. Both functions are combined in one unit.

12. カード 12

    質問

    Which component stores energy in an electric field?

    回答

    A capacitor.

13. カード 13

    質問

    What is the defining radiation-pattern advantage of a beam antenna?

    回答

    It concentrates radiation in one direction.

14. カード 14

    質問

    What bandwidth is typical for an SSB voice signal?

    回答

    About 3 kHz.

15. カード 15

    質問

    What is a clear way to begin a voice CQ call?

    回答

    Say “CQ” a few times, then “this is” and your call sign; pause and listen before repeating.

16. カード 16

    質問

    Where does an RF power meter belong when measuring transmitter output to an antenna?

    回答

    In the feed line between the transmitter and the antenna.

17. カード 17

    質問

    How often must an amateur station identify during a communication?

    回答

    At least every 10 minutes and at the end of the communication. A tactical identifier does not replace the assigned call sign.

18. カード 18

    質問

    What unit measures electric current?

    回答

    The ampere (amp).

19. カード 19

    質問

    Where should a fuse or circuit breaker go in a 120-volt AC circuit?

    回答

    In series with the hot conductor only. Do not put the protective device only in the neutral conductor.

20. カード 20

    質問

    How does wavelength change when frequency increases?

    回答

    Wavelength decreases. Frequency and wavelength are inversely related when propagation speed is fixed.

21. カード 21

    質問

    What does receiver sensitivity describe?

    回答

    The ability to detect weak signals. Better sensitivity means a weaker usable signal can be received.

22. カード 22

    質問

    Which component stores energy in a magnetic field?

    回答

    An inductor.

23. カード 23

    質問

    What does antenna gain describe?

    回答

    Signal-strength improvement in a chosen direction compared with a reference antenna. Gain redistributes radiation rather than creating transmitter power.

24. カード 24

    質問

    What 10-meter frequency range gives a Technician voice privileges?

    回答

    28.300 to 28.500 MHz. This is the Technician phone segment on 10 meters.

25. カード 25

    質問

    What does simplex operation mean?

    回答

    Both stations transmit and receive on the same frequency. No repeater frequency pair is involved.

26. カード 26

    質問

    What bandwidth is typical for a VHF repeater FM voice signal?

    回答

    About 10 to 15 kHz.

27. カード 27

    質問

    How many milliamperes are in 1.5 amperes?

    回答

    1,500 milliamperes. Multiply amperes by 1,000.

28. カード 28

    質問

    What conductor is preferred for RF bonding between station equipment?

    回答

    Flat copper strap.

29. カード 29

    質問

    What hazard can rapid charging or discharging create in an unprotected battery?

    回答

    Overheating or out-gassing. Use the battery’s specified protection and charge limits.

30. カード 30

    質問

    Which semiconductor component normally allows current in only one direction?

    回答

    A diode.

31. カード 31

    質問

    When may a newly licensed amateur first transmit?

    回答

    After the license grant appears in the FCC license database. Passing the exam alone does not authorize transmission.

32. カード 32

    質問

    What does receiver selectivity describe?

    回答

    The ability to separate a desired signal from signals on nearby frequencies.

33. カード 33

    質問

    What repeater offset is commonly used on the 2-meter band?

    回答

    Plus or minus 600 kHz. The sign depends on the repeater’s input/output pair.

34. カード 34

    質問

    What shortcut estimates wavelength in meters from frequency in megahertz?

    回答

    Divide 300 by the frequency in MHz. wavelength (m) ≈ 300 / frequency (MHz)

35. カード 35

    質問

    What happens to a dipole’s resonant frequency when the antenna is shortened?

    回答

    The resonant frequency increases. A shorter dipole resonates at a shorter wavelength and therefore a higher frequency.

36. カード 36

    質問

    Which electrical property describes energy storage in an electric field?

    回答

    Capacitance. Its unit is the farad.

37. カード 37

    質問

    What is Doppler shift?

    回答

    A change in observed frequency caused by relative motion between transmitter and receiver. Satellite operators compensate for it as the spacecraft passes.

38. カード 38

    質問

    What should an antenna installer do about nearby overhead electrical wires?

    回答

    Locate them first and stay clear of them. This is an installation-safety rule, not an RF operating technique.

39. カード 39

    質問

    Where should a mobile transceiver’s negative power return connect in a vehicle?

    回答

    At the 12-volt battery’s chassis-ground connection. Follow the radio and vehicle installation instructions when making the connection.

40. カード 40

    質問

    Which amateur transmissions may use deliberately obscured message content?

    回答

    Commands to space stations or radio-controlled models. Ordinary amateur messages may not be encoded to hide their meaning.

41. カード 41

    質問

    Which semiconductor component can act as an electronic switch?

    回答

    A transistor. It can control a larger current with a smaller input signal.

42. カード 42

    質問

    What repeater offset is commonly used on the 70-centimeter band?

    回答

    Plus or minus 5 MHz.

43. カード 43

    質問

    What simple device can suppress RF feedback traveling on a microphone cable?

    回答

    A ferrite choke. It adds impedance to unwanted common-mode RF current on the cable.

44. カード 44

    質問

    What does a loading coil do in a shortened antenna?

    回答

    It electrically lengthens the antenna. The added inductive reactance helps a physically short radiator resonate lower.

45. カード 45

    質問

    Which electrical property describes energy storage in a magnetic field?

    回答

    Inductance. Its unit is the henry.

46. カード 46

    質問

    Which polarization is normally used for long-distance VHF/UHF CW and SSB contacts?

    回答

    Horizontal polarization.

47. カード 47

    質問

    What is the maximum transmitter power in the HF segments available to a Technician?

    回答

    200 watts PEP. That ceiling applies to the Technician HF segments, including 28.0–28.5 MHz.

48. カード 48

    質問

    How much clearance should a new antenna have from power wires?

    回答

    Enough that no part of the antenna can come within 10 feet of the wires if it falls.

49. カード 49

    質問

    About how long does a low-Earth-orbit amateur satellite take to circle Earth?

    回答

    About 100 minutes.

50. カード 50

    質問

    What happens when an SSB transmitter’s microphone gain is set too high?

    回答

    The transmitted audio becomes distorted.

51. カード 51

    質問

    What does a CTCSS tone do in repeater operation?

    回答

    It provides a subaudible access tone that can open the repeater receiver. It does not encrypt the conversation.

52. カード 52

    質問

    What does a schematic diagram show?

    回答

    Electrical connections using standardized component symbols. It describes circuit function, not physical placement.

53. カード 53

    質問

    What formula gives DC electrical power from voltage and current?

    回答

    P = E × I. For example, 12 volts at 2 amperes is 24 watts.

54. カード 54

    質問

    Where is a half-wave dipole’s radiation strongest?

    回答

    Broadside to the wire. Radiation is weakest off the ends.

55. カード 55

    質問

    How long is a normal U.S. amateur radio license term?

    回答

    10 years. Renewal is required to continue operating after the term expires.

56. カード 56

    質問

    What load should replace an antenna for transmitter tests that should not radiate a signal?

    回答

    A dummy load. It absorbs RF power while presenting a suitable impedance to the transmitter.

57. カード 57

    質問

    What is a proper grounding arrangement for a tower?

    回答

    Use a separate eight-foot ground rod at each tower leg, bonded to the tower and to the other rods. Follow applicable electrical codes and local requirements.

58. カード 58

    質問

    Why can a VHF signal change sharply when an antenna moves only a few feet?

    回答

    Multipath propagation. Reflected signal paths can add or cancel at nearby points.

59. カード 59

    質問

    How can an operator judge suitable uplink power through a linear amateur satellite transponder?

    回答

    Keep the received downlink signal about as strong as the satellite beacon.

60. カード 60

    質問

    What is a DMR color code?

    回答

    A repeater access code used by DMR systems. It is not a description of display color or signal quality.

61. カード 61

    質問

    What does a power-supply rectifier do?

    回答

    It changes AC into a varying or pulsating DC voltage. Filtering can then smooth that voltage.

62. カード 62

    質問

    Which receiver control corrects a returned SSB voice that sounds too high or too low in pitch?

    回答

    The RIT, also called the clarifier. It shifts the receive tuning enough to restore natural voice pitch.

63. カード 63

    質問

    When may a U.S. amateur station normally relay a third party’s message to a station in another country?

    回答

    When that country has a third-party communications arrangement with the United States. Emergency or disaster-relief traffic has a separate exception.

64. カード 64

    質問

    What form of Ohm’s law gives current from voltage and resistance?

    回答

    I = E / R. For example, 12 volts across 6 ohms produces 2 amperes.

65. カード 65

    質問

    How does coaxial-cable loss change as signal frequency increases?

    回答

    Loss increases. The same cable run usually wastes more power at higher frequencies.

66. カード 66

    質問

    What does a 4:1 SWR indicate?

    回答

    A serious impedance mismatch. It is much worse than the near-1:1 match a transmitter normally prefers.

67. カード 67

    質問

    Are amateur radio signals ionizing or non-ionizing radiation?

    回答

    Non-ionizing radiation. RF exposure still requires compliance with FCC limits.

68. カード 68

    質問

    What is the general maximum transmitter power for Technician operation above 30 MHz?

    回答

    1,500 watts PEP, unless a narrower rule sets a lower limit. In actual operation, Part 97 also requires using only the power needed for the communication.

69. カード 69

    質問

    What does a DMR talkgroup identify?

    回答

    A logical group of users or traffic on a DMR system. It routes a transmission to the intended group.

70. カード 70

    質問

    What is a Maidenhead grid locator?

    回答

    A letter-and-number designator for a geographic area. Operators exchange it to describe station location compactly.

71. カード 71

    質問

    Which component uses an electrical control signal to open or close contacts in another circuit?

    回答

    A relay. It is an electrically controlled switch.

72. カード 72

    質問

    Which electrical quantity is the same through every component in a series circuit?

    回答

    Current. A series circuit has only one current path.

73. カード 73

    質問

    Why is the VHF/UHF radio horizon usually a little farther than the visual horizon?

    回答

    The atmosphere refracts radio waves slightly. This modest bending extends the practical radio horizon.

74. カード 74

    質問

    How should receiver filter bandwidth be set to reduce noise and nearby interference?

    回答

    Use the narrowest bandwidth that still passes the desired signal. Different modes need different practical widths.

75. カード 75

    質問

    What is the main function of an antenna tuner?

    回答

    To match the antenna system’s impedance to the transceiver’s output impedance. It helps the transmitter see a suitable load.

76. カード 76

    質問

    What does Part 97 say about deliberately disrupting another radio communication?

    回答

    Willful or malicious interference is prohibited. Frequency use is shared, not assigned exclusively to one station.

77. カード 77

    質問

    How is a voltmeter connected to measure voltage across a component?

    回答

    In parallel with the component.

78. カード 78

    質問

    Why does duty cycle matter in an RF exposure evaluation?

    回答

    It changes average exposure. A transmitter active for a smaller fraction of the averaging period contributes less average RF energy.

79. カード 79

    質問

    What is the central job of a net control station?

    回答

    Call the net to order and direct participating stations. Net control organizes check-ins and traffic flow.

80. カード 80

    質問

    Which electrical quantity is the same across every branch of a parallel circuit?

    回答

    Voltage. Each branch connects across the same two nodes.

81. カード 81

    質問

    Which component can step 120-volt AC down to a lower AC voltage?

    回答

    A transformer.

82. カード 82

    質問

    What does APRS commonly provide?

    回答

    Real-time tactical digital communication, including station positions shown on a map.

83. カード 83

    質問

    When a DMR radio’s channels, repeater settings, contacts, and talkgroups are saved together, what is that data set called?

    回答

    A DMR code plug. It is the radio’s configuration data set.

84. カード 84

    質問

    What does standing wave ratio measure in a feed line?

    回答

    How well the load impedance matches the feed line. An SWR near 1:1 indicates a close match.

85. カード 85

    質問

    What can an operator do during the two-year filing grace period after an amateur license expires?

    回答

    Apply for renewal, but do not transmit until the license is renewed. The grace period preserves a renewal path, not operating privileges.

86. カード 86

    質問

    Which propagation mode can produce occasional strong 10-, 6-, and 2-meter contacts beyond the normal radio horizon?

    回答

    Sporadic E. It can briefly carry signals well beyond ordinary VHF line-of-sight range.

87. カード 87

    質問

    Do Part 97 rules stop applying during ARES, RACES, FEMA, or emergency operations?

    回答

    No. FCC amateur radio rules always apply. Emergency conditions may activate specific provisions, but they do not erase Part 97.

88. カード 88

    質問

    Who is responsible for keeping people below FCC RF exposure limits at an amateur station?

    回答

    The station licensee. This is a compliance responsibility; practical evaluations can use calculation, modeling, or calibrated measurement.

89. カード 89

    質問

    How is an ammeter connected to measure current in a circuit?

    回答

    In series with the circuit path.

90. カード 90

    質問

    What decibel change represents doubling transmitter power from 5 watts to 10 watts?

    回答

    About +3 dB. A 3 dB increase corresponds to roughly twice the power.

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Ham Radio Technician Flashcards: 90 Core Concepts for 2026-2030

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