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