Ham Radio Technician Flashcards: 90 Core Concepts for 2026-2030
Review 90 core concepts for the 2026–2030 U.S. Technician Class exam across all ten NCVEC subelements.
Über dieses Lernkartenset
Prepare for the U.S. Technician Class (Element 2) exam pool in effect from July 1, 2026, through June 30, 2030. These 90 core-concept flashcards use one-target prompts, direct answers, and brief explanations across all ten official NCVEC subelements.
This compact deck complements—not replaces—the full 409-question pool, randomized 35-question practice exams, and the three official diagrams. It does not reproduce the official multiple-choice wording, choices, distractors, or answer letters, and it does not claim full-pool coverage.
Facts were checked against the corrected February 19, 2026 NCVEC pool and current 47 CFR Part 97. Card wording and explanations are original. This independent study resource is not affiliated with or endorsed by NCVEC, the FCC, or any examination team. Consult the official pool at https://ncvec.org/index.php/2026-2030-technician-question-pool.
Karten in diesem Lernkartenset
Karte 1
Frage
Which component is commonly used as an adjustable volume control?
Antwort
A potentiometer. It is a variable resistor with a movable contact.
Karte 2
Frage
Which U.S. agency regulates and enforces the Amateur Radio Service rules?
Antwort
The Federal Communications Commission (FCC). It administers the rules that govern U.S. amateur stations.
Karte 3
Frage
Which common voice mode uses less bandwidth: SSB or FM?
Antwort
SSB uses less bandwidth. This makes it well suited to crowded HF spectrum.
Karte 4
Frage
What determines a radio wave’s polarization?
Antwort
The orientation of its electric field.
Karte 5
Frage
What power-supply rating is typical for a 50-watt mobile FM transceiver?
Antwort
About 13.8 volts at 12 amperes. The current rating must cover the radio’s transmit demand.
Karte 6
Frage
What is an amateur band plan?
Antwort
A voluntary guide for using different modes and activities within a band. It supplements—not replaces—FCC frequency privileges.
Karte 7
Frage
How fast does a radio wave travel through free space?
Antwort
At the speed of light. Radio waves are electromagnetic waves.
Karte 8
Frage
What is a fuse designed to do during an electrical overload?
Antwort
Open the circuit and remove power. It protects wiring and equipment from excessive current.
Karte 9
Frage
What electrical quantity causes electrons to flow in a circuit?
Antwort
Voltage, or electrical potential difference. Current is the resulting flow of charge.
Karte 10
Frage
When the station licensee and control operator are different people, who is responsible for proper station operation?
Antwort
Both are equally responsible. The station licensee and the control operator share responsibility for compliance.
Karte 11
Frage
Which two major radio functions are combined inside a transceiver?
Antwort
A transmitter and a receiver. Both functions are combined in one unit.
Karte 12
Frage
Which component stores energy in an electric field?
Antwort
A capacitor.
Karte 13
Frage
What is the defining radiation-pattern advantage of a beam antenna?
Antwort
It concentrates radiation in one direction.
Karte 14
Frage
What bandwidth is typical for an SSB voice signal?
Antwort
About 3 kHz.
Karte 15
Frage
What is a clear way to begin a voice CQ call?
Antwort
Say “CQ” a few times, then “this is” and your call sign; pause and listen before repeating.
Karte 16
Frage
Where does an RF power meter belong when measuring transmitter output to an antenna?
Antwort
In the feed line between the transmitter and the antenna.
Karte 17
Frage
How often must an amateur station identify during a communication?
Antwort
At least every 10 minutes and at the end of the communication. A tactical identifier does not replace the assigned call sign.
Karte 18
Frage
What unit measures electric current?
Antwort
The ampere (amp).
Karte 19
Frage
Where should a fuse or circuit breaker go in a 120-volt AC circuit?
Antwort
In series with the hot conductor only. Do not put the protective device only in the neutral conductor.
Karte 20
Frage
How does wavelength change when frequency increases?
Antwort
Wavelength decreases. Frequency and wavelength are inversely related when propagation speed is fixed.
Karte 21
Frage
What does receiver sensitivity describe?
Antwort
The ability to detect weak signals. Better sensitivity means a weaker usable signal can be received.
Karte 22
Frage
Which component stores energy in a magnetic field?
Antwort
An inductor.
Karte 23
Frage
What does antenna gain describe?
Antwort
Signal-strength improvement in a chosen direction compared with a reference antenna. Gain redistributes radiation rather than creating transmitter power.
Karte 24
Frage
What 10-meter frequency range gives a Technician voice privileges?
Antwort
28.300 to 28.500 MHz. This is the Technician phone segment on 10 meters.
Karte 25
Frage
What does simplex operation mean?
Antwort
Both stations transmit and receive on the same frequency. No repeater frequency pair is involved.
Karte 26
Frage
What bandwidth is typical for a VHF repeater FM voice signal?
Antwort
About 10 to 15 kHz.
Karte 27
Frage
How many milliamperes are in 1.5 amperes?
Antwort
1,500 milliamperes. Multiply amperes by 1,000.
Karte 28
Frage
What conductor is preferred for RF bonding between station equipment?
Antwort
Flat copper strap.
Karte 29
Frage
What hazard can rapid charging or discharging create in an unprotected battery?
Antwort
Overheating or out-gassing. Use the battery’s specified protection and charge limits.
Karte 30
Frage
Which semiconductor component normally allows current in only one direction?
Antwort
A diode.
Karte 31
Frage
When may a newly licensed amateur first transmit?
Antwort
After the license grant appears in the FCC license database. Passing the exam alone does not authorize transmission.
Karte 32
Frage
What does receiver selectivity describe?
Antwort
The ability to separate a desired signal from signals on nearby frequencies.
Karte 33
Frage
What repeater offset is commonly used on the 2-meter band?
Antwort
Plus or minus 600 kHz. The sign depends on the repeater’s input/output pair.
Karte 34
Frage
What shortcut estimates wavelength in meters from frequency in megahertz?
Antwort
Divide 300 by the frequency in MHz.
wavelength (m) ≈ 300 / frequency (MHz)Karte 35
Frage
What happens to a dipole’s resonant frequency when the antenna is shortened?
Antwort
The resonant frequency increases. A shorter dipole resonates at a shorter wavelength and therefore a higher frequency.
Karte 36
Frage
Which electrical property describes energy storage in an electric field?
Antwort
Capacitance. Its unit is the farad.
Karte 37
Frage
What is Doppler shift?
Antwort
A change in observed frequency caused by relative motion between transmitter and receiver. Satellite operators compensate for it as the spacecraft passes.
Karte 38
Frage
What should an antenna installer do about nearby overhead electrical wires?
Antwort
Locate them first and stay clear of them. This is an installation-safety rule, not an RF operating technique.
Karte 39
Frage
Where should a mobile transceiver’s negative power return connect in a vehicle?
Antwort
At the 12-volt battery’s chassis-ground connection. Follow the radio and vehicle installation instructions when making the connection.
Karte 40
Frage
Which amateur transmissions may use deliberately obscured message content?
Antwort
Commands to space stations or radio-controlled models. Ordinary amateur messages may not be encoded to hide their meaning.
Karte 41
Frage
Which semiconductor component can act as an electronic switch?
Antwort
A transistor. It can control a larger current with a smaller input signal.
Karte 42
Frage
What repeater offset is commonly used on the 70-centimeter band?
Antwort
Plus or minus 5 MHz.
Karte 43
Frage
What simple device can suppress RF feedback traveling on a microphone cable?
Antwort
A ferrite choke. It adds impedance to unwanted common-mode RF current on the cable.
Karte 44
Frage
What does a loading coil do in a shortened antenna?
Antwort
It electrically lengthens the antenna. The added inductive reactance helps a physically short radiator resonate lower.
Karte 45
Frage
Which electrical property describes energy storage in a magnetic field?
Antwort
Inductance. Its unit is the henry.
Karte 46
Frage
Which polarization is normally used for long-distance VHF/UHF CW and SSB contacts?
Antwort
Horizontal polarization.
Karte 47
Frage
What is the maximum transmitter power in the HF segments available to a Technician?
Antwort
200 watts PEP. That ceiling applies to the Technician HF segments, including 28.0–28.5 MHz.
Karte 48
Frage
How much clearance should a new antenna have from power wires?
Antwort
Enough that no part of the antenna can come within 10 feet of the wires if it falls.
Karte 49
Frage
About how long does a low-Earth-orbit amateur satellite take to circle Earth?
Antwort
About 100 minutes.
Karte 50
Frage
What happens when an SSB transmitter’s microphone gain is set too high?
Antwort
The transmitted audio becomes distorted.
Karte 51
Frage
What does a CTCSS tone do in repeater operation?
Antwort
It provides a subaudible access tone that can open the repeater receiver. It does not encrypt the conversation.
Karte 52
Frage
What does a schematic diagram show?
Antwort
Electrical connections using standardized component symbols. It describes circuit function, not physical placement.
Karte 53
Frage
What formula gives DC electrical power from voltage and current?
Antwort
P = E × I. For example, 12 volts at 2 amperes is 24 watts.Karte 54
Frage
Where is a half-wave dipole’s radiation strongest?
Antwort
Broadside to the wire. Radiation is weakest off the ends.
Karte 55
Frage
How long is a normal U.S. amateur radio license term?
Antwort
10 years. Renewal is required to continue operating after the term expires.
Karte 56
Frage
What load should replace an antenna for transmitter tests that should not radiate a signal?
Antwort
A dummy load. It absorbs RF power while presenting a suitable impedance to the transmitter.
Karte 57
Frage
What is a proper grounding arrangement for a tower?
Antwort
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.
Karte 58
Frage
Why can a VHF signal change sharply when an antenna moves only a few feet?
Antwort
Multipath propagation. Reflected signal paths can add or cancel at nearby points.
Karte 59
Frage
How can an operator judge suitable uplink power through a linear amateur satellite transponder?
Antwort
Keep the received downlink signal about as strong as the satellite beacon.
Karte 60
Frage
What is a DMR color code?
Antwort
A repeater access code used by DMR systems. It is not a description of display color or signal quality.
Karte 61
Frage
What does a power-supply rectifier do?
Antwort
It changes AC into a varying or pulsating DC voltage. Filtering can then smooth that voltage.
Karte 62
Frage
Which receiver control corrects a returned SSB voice that sounds too high or too low in pitch?
Antwort
The RIT, also called the clarifier. It shifts the receive tuning enough to restore natural voice pitch.
Karte 63
Frage
When may a U.S. amateur station normally relay a third party’s message to a station in another country?
Antwort
When that country has a third-party communications arrangement with the United States. Emergency or disaster-relief traffic has a separate exception.
Karte 64
Frage
What form of Ohm’s law gives current from voltage and resistance?
Antwort
I = E / R. For example, 12 volts across 6 ohms produces 2 amperes.Karte 65
Frage
How does coaxial-cable loss change as signal frequency increases?
Antwort
Loss increases. The same cable run usually wastes more power at higher frequencies.
Karte 66
Frage
What does a 4:1 SWR indicate?
Antwort
A serious impedance mismatch. It is much worse than the near-1:1 match a transmitter normally prefers.
Karte 67
Frage
Are amateur radio signals ionizing or non-ionizing radiation?
Antwort
Non-ionizing radiation. RF exposure still requires compliance with FCC limits.
Karte 68
Frage
What is the general maximum transmitter power for Technician operation above 30 MHz?
Antwort
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.
Karte 69
Frage
What does a DMR talkgroup identify?
Antwort
A logical group of users or traffic on a DMR system. It routes a transmission to the intended group.
Karte 70
Frage
What is a Maidenhead grid locator?
Antwort
A letter-and-number designator for a geographic area. Operators exchange it to describe station location compactly.
Karte 71
Frage
Which component uses an electrical control signal to open or close contacts in another circuit?
Antwort
A relay. It is an electrically controlled switch.
Karte 72
Frage
Which electrical quantity is the same through every component in a series circuit?
Antwort
Current. A series circuit has only one current path.
Karte 73
Frage
Why is the VHF/UHF radio horizon usually a little farther than the visual horizon?
Antwort
The atmosphere refracts radio waves slightly. This modest bending extends the practical radio horizon.
Karte 74
Frage
How should receiver filter bandwidth be set to reduce noise and nearby interference?
Antwort
Use the narrowest bandwidth that still passes the desired signal. Different modes need different practical widths.
Karte 75
Frage
What is the main function of an antenna tuner?
Antwort
To match the antenna system’s impedance to the transceiver’s output impedance. It helps the transmitter see a suitable load.
Karte 76
Frage
What does Part 97 say about deliberately disrupting another radio communication?
Antwort
Willful or malicious interference is prohibited. Frequency use is shared, not assigned exclusively to one station.
Karte 77
Frage
How is a voltmeter connected to measure voltage across a component?
Antwort
In parallel with the component.
Karte 78
Frage
Why does duty cycle matter in an RF exposure evaluation?
Antwort
It changes average exposure. A transmitter active for a smaller fraction of the averaging period contributes less average RF energy.
Karte 79
Frage
What is the central job of a net control station?
Antwort
Call the net to order and direct participating stations. Net control organizes check-ins and traffic flow.
Karte 80
Frage
Which electrical quantity is the same across every branch of a parallel circuit?
Antwort
Voltage. Each branch connects across the same two nodes.
Karte 81
Frage
Which component can step 120-volt AC down to a lower AC voltage?
Antwort
A transformer.
Karte 82
Frage
What does APRS commonly provide?
Antwort
Real-time tactical digital communication, including station positions shown on a map.
Karte 83
Frage
When a DMR radio’s channels, repeater settings, contacts, and talkgroups are saved together, what is that data set called?
Antwort
A DMR code plug. It is the radio’s configuration data set.
Karte 84
Frage
What does standing wave ratio measure in a feed line?
Antwort
How well the load impedance matches the feed line. An SWR near 1:1 indicates a close match.
Karte 85
Frage
What can an operator do during the two-year filing grace period after an amateur license expires?
Antwort
Apply for renewal, but do not transmit until the license is renewed. The grace period preserves a renewal path, not operating privileges.
Karte 86
Frage
Which propagation mode can produce occasional strong 10-, 6-, and 2-meter contacts beyond the normal radio horizon?
Antwort
Sporadic E. It can briefly carry signals well beyond ordinary VHF line-of-sight range.
Karte 87
Frage
Do Part 97 rules stop applying during ARES, RACES, FEMA, or emergency operations?
Antwort
No. FCC amateur radio rules always apply. Emergency conditions may activate specific provisions, but they do not erase Part 97.
Karte 88
Frage
Who is responsible for keeping people below FCC RF exposure limits at an amateur station?
Antwort
The station licensee. This is a compliance responsibility; practical evaluations can use calculation, modeling, or calibrated measurement.
Karte 89
Frage
How is an ammeter connected to measure current in a circuit?
Antwort
In series with the circuit path.
Karte 90
Frage
What decibel change represents doubling transmitter power from 5 watts to 10 watts?
Antwort
About +3 dB. A 3 dB increase corresponds to roughly twice the power.
90 Karten
Ham Radio Technician Flashcards: 90 Core Concepts for 2026-2030
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