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