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