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