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