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