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