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