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