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