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