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