Amateur Radio Technician Class License Exam — Questions and Answers

Question 1: What is CTCSS in the context of repeater operation?

A frequency coordination protocol for repeater trustees
A system for linking repeaters via the internet
A subaudible tone system used to selectively activate repeaters (Correct answer)
A digital data system for repeater identification

Correct answer: A subaudible tone system used to selectively activate repeaters

CTCSS (Continuous Tone-Coded Squelch System) uses subaudible tones transmitted with your signal to selectively open a repeater's squelch.

Question 2: What is the effect of operating an antenna significantly off its resonant frequency without a tuner?

High SWR and increased feedline loss (Correct answer)
Lower noise floor on receive
Increased antenna gain
The transceiver automatically adjusts power

Correct answer: High SWR and increased feedline loss

Operating an antenna off-resonance causes a high SWR, which increases feedline losses and can stress the transmitter's output stage.

Question 3: What qualifies as a QPSK31 characteristic?

Its encoding provides error correction
It is sideband sensitive
Its bandwidth is approximately the same as BPSK31
All these choices are correct (Correct answer)

Correct answer: All these choices are correct

QPSK31 (Quadrature Phase-Shift Keying 31) is a digital modulation mode used in amateur radio communications and other applications.

Question 4: What is a J-pole antenna?

A half-wave radiator fed at the base via a quarter-wave matching stub (Correct answer)
A dipole bent into a J shape to reduce wind loading
A type of loop antenna for 40 meters
A vertical antenna with a J-shaped ground radial

Correct answer: A half-wave radiator fed at the base via a quarter-wave matching stub

The J-pole uses a quarter-wave matching section (the 'J' foot) to feed a half-wave vertical element at its natural current maximum.

Question 5: What is the main disadvantage of using a very long coaxial feedline run at UHF frequencies?

Increased radiation from the feedline
Reduced antenna bandwidth
Higher SWR due to cable length
Significantly increased signal loss (Correct answer)

Correct answer: Significantly increased signal loss

Coaxial cable loss increases with frequency, so long runs at UHF can lose a substantial portion of your transmit power.

Question 6: What does an RF power meter read when the antenna feedline is open (disconnected at the antenna end)?

Normal forward power and no reflected
Half forward power and half reflected
Zero watts forward, zero reflected
Full forward power and full reflected power (SWR infinite) (Correct answer)

Correct answer: Full forward power and full reflected power (SWR infinite)

An open circuit reflects all transmitted power back toward the transmitter, so forward equals reflected and the SWR reading is effectively infinite.

Question 7: What does 'QSL' mean in amateur radio?

Antenna location
Noise level report
I acknowledge receipt (Correct answer)
Please speak slower

Correct answer: I acknowledge receipt

QSL is a Q-code in amateur radio that means 'I acknowledge receipt' or 'I have received your transmission.' It is commonly used to confirm that a message or contact has been successfully received and understood, often followed by sending a physical QSL card to verify the contact.

Question 8: When using a handheld transceiver with a rubber duck antenna, how should you hold it to minimize RF exposure to your head?

Wrap your hand around the antenna to reduce radiated power
Press the antenna against your cheek for better signal coupling
Hold the radio horizontally so the antenna points away from your body
Keep the antenna vertical and hold the radio away from your face while transmitting (Correct answer)

Correct answer: Keep the antenna vertical and hold the radio away from your face while transmitting

Holding the radio upright with the antenna away from your head reduces the amount of RF your tissue absorbs during transmission.

Question 9: When installing a mobile VHF/UHF antenna on a vehicle, what is the purpose of making a good DC ground connection to the vehicle chassis?

To provide an RF ground plane that improves antenna performance and reduces noise (Correct answer)
To meet FCC Part 95 requirements
To prevent the antenna from vibrating at highway speeds
To supply operating voltage to the radio

Correct answer: To provide an RF ground plane that improves antenna performance and reduces noise

The vehicle chassis acts as the antenna's ground plane; a solid RF bond between the antenna mount and chassis ensures efficient radiation and minimizes noise pickup.

Question 10: What is the purpose of bonding all metallic objects in an amateur radio station together?

To improve SWR by equalizing capacitance
To prevent RF ground loops
To reduce the chance of dangerous voltage differences between objects during a fault or lightning event (Correct answer)
To increase antenna efficiency

Correct answer: To reduce the chance of dangerous voltage differences between objects during a fault or lightning event

Bonding equalizes potentials so no dangerous voltage difference exists between metal objects that a person might bridge simultaneously.

Question 11: What is the purpose of using a phonetic alphabet when exchanging call signs?

To allow non-English speakers to understand call signs
To reduce errors caused by similar-sounding letters over the air (Correct answer)
To comply with FCC regulations requiring phonetics
To make transmissions sound more professional

Correct answer: To reduce errors caused by similar-sounding letters over the air

Phonetics replace easily confused letters (like B/D, M/N, S/F) with distinct words, greatly reducing copying errors during radio communication.

Question 12: What does the term 'skip zone' mean in HF propagation?

The area covered by tropospheric ducting
The area where ground wave coverage ends and sky wave coverage begins, with no coverage in between (Correct answer)
The distance between two ionospheric reflection points
A region of heavy ionospheric absorption

Correct answer: The area where ground wave coverage ends and sky wave coverage begins, with no coverage in between

The skip zone is the region between the farthest reach of ground wave propagation and the nearest point where sky wave signals return to Earth, resulting in no reception of a given station.

Question 13: What is the purpose of placing warning signs near a transmitting antenna installation?

To warn uninformed persons of potential RF exposure so they can maintain safe distance (Correct answer)
To mark property boundaries near tower guy wires
To satisfy FCC licensing requirements for commercial installations only
To deter theft of antenna equipment

Correct answer: To warn uninformed persons of potential RF exposure so they can maintain safe distance

Warning signs alert people who may be unaware of RF hazards so they can avoid close proximity to a transmitting antenna.

Question 14: What is IRLP (Internet Radio Linking Project)?

A system for broadcasting shortwave radio content globally
A satellite-based linking system for amateur radio stations
A method of connecting amateur radio repeaters to each other via the internet (Correct answer)
A digital packet radio protocol based on AX.25

Correct answer: A method of connecting amateur radio repeaters to each other via the internet

IRLP uses dedicated hardware nodes and the internet to connect amateur radio repeaters around the world, allowing stations to communicate across long distances.

Question 15: What is the purpose of a CTCSS tone on a repeater?

To increase the repeater's output power
To open the repeater only to signals carrying the correct subaudible tone (Correct answer)
To encrypt the transmission
To identify the repeater's call sign automatically

Correct answer: To open the repeater only to signals carrying the correct subaudible tone

CTCSS (Continuous Tone-Coded Squelch System) causes the repeater to open only when it receives a signal that includes the correct subaudible tone.

Question 16: What does the term 'full quieting' mean when receiving a signal on FM?

The received signal is strong enough to completely suppress background noise (Correct answer)
The operator is using noise-canceling equipment
The operator has stopped transmitting
The repeater has gone into a quiet mode

Correct answer: The received signal is strong enough to completely suppress background noise

Full quieting means the incoming signal is strong enough to fully engage the FM limiter, producing perfectly clean audio with no background hiss.

Question 17: Which component stores electrical energy in an electric field?

Transformer
Resistor
Inductor
Capacitor (Correct answer)

Correct answer: Capacitor

A capacitor is an electronic component specifically designed to store electrical energy in an electric field. It consists of two conductive plates separated by an insulating material called a dielectric.

Question 18: What is a 'rubber duck' antenna on a handheld radio?

A short, flexible whip antenna (Correct answer)
A magnetic-base mobile antenna
A folded dipole antenna
A high-gain directional antenna

Correct answer: A short, flexible whip antenna

A 'rubber duck' is a short, flexible monopole antenna commonly supplied with handheld transceivers.

Question 19: For a vertical antenna mounted on a vehicle rooftop, the car body serves as:

A noise shield
A loading coil
The ground plane (Correct answer)
A director element

Correct answer: The ground plane

The metal vehicle body acts as the ground plane, providing the RF return path for the vertical antenna.

Question 20: What does the term 'controlled environment' mean in the context of FCC RF exposure limits?

An area where occupants are aware of RF exposure and can take protective action (Correct answer)
A shielded room that blocks all RF
An environment regulated by OSHA for industrial RF use
Any location more than 50 feet from an antenna

Correct answer: An area where occupants are aware of RF exposure and can take protective action

A controlled environment is one where people are knowledgeable about RF exposure and can take steps to limit it, such as the operator's own location.

Question 21: When working in a confined space, what should an operator do?

Use a flashlight
Ensure ventilation and have assistance nearby (Correct answer)
Turn off all devices
Work alone to avoid distractions

Correct answer: Ensure ventilation and have assistance nearby

Working in confined spaces presents several hazards, including poor air quality, oxygen depletion, and limited escape routes. Ensuring proper ventilation helps prevent the buildup of hazardous fumes or gases, while having assistance nearby ensures that help is readily available in case of an emergency or if the operator becomes incapacitated. These precautions are vital for safety in such environments.

Question 22: Which of the following is considered poor operating etiquette?

Giving signal reports
Using Q-codes properly
Using plain language
Interrupting other operators (Correct answer)

Correct answer: Interrupting other operators

Interrupting other operators while they are engaged in a conversation is considered poor operating etiquette in ham radio. It disrupts the flow of communication and shows disrespect for others on the air. Operators should wait for a break in the conversation or for an invitation to join before transmitting.

Question 23: What happens if the antenna is not resonant at the operating frequency?

Higher output power
Poor transmission (Correct answer)
Better reception
Increased range

Correct answer: Poor transmission

If an antenna is not resonant at the operating frequency, its impedance will not be matched to the feedline and transmitter. This mismatch causes a high Standing Wave Ratio (SWR), meaning a significant portion of the transmitted power is reflected back towards the radio instead of being radiated by the antenna. Consequently, the antenna will be inefficient, resulting in poor transmission performance and reduced signal strength.

Question 24: What is the purpose of a dummy load?

To increase antenna gain during contests
To reduce transmitter output power for low-power operation
To match an antenna to a different frequency band
To allow transmitter testing without radiating a signal (Correct answer)

Correct answer: To allow transmitter testing without radiating a signal

A dummy load absorbs transmitter power as heat so the operator can test equipment without transmitting an over-the-air signal.

Question 25: What is the minimum safe distance a power line should be from an amateur radio tower?

Far enough that the tower and all attached hardware cannot fall onto the power line (Correct answer)
There is no specific requirement
At least 50 feet vertically
At least 10 feet horizontally

Correct answer: Far enough that the tower and all attached hardware cannot fall onto the power line

The tower and everything attached to it must be positioned so that if it falls in any direction it cannot contact a power line, preventing deadly electrocution hazards.

Question 26: What is the significance of the 'phonetic alphabet' in amateur radio licensing regulations?

It is recommended to improve clarity of call sign identification but is not legally required (Correct answer)
Its use is mandatory when giving station identification
The FCC requires phonetics only on HF bands
It is prohibited because it obscures the true call sign

Correct answer: It is recommended to improve clarity of call sign identification but is not legally required

The phonetic alphabet is widely recommended for clarity but FCC rules do not require its use for station identification.

Question 27: Which phenomenon explains why 6-meter (50 MHz) signals can sometimes propagate across the entire continental US without the F layer?

Meteor scatter
Ground wave
Tropospheric ducting
Sporadic-E propagation (Correct answer)

Correct answer: Sporadic-E propagation

Sporadic-E (Es) patches of dense ionization in the E layer can refract 6-meter signals over distances of 500–1,500 miles, occasionally linking stations across the continent.

Question 28: What is the power factor of a purely resistive AC circuit?

1 (Correct answer)
0
Infinity
0.5

Correct answer: 1

A purely resistive circuit has a power factor of 1 because voltage and current are in phase.

Question 29: Where are the rectangular coordinates for the impedance of a pure resistance plotted?

On a horizontal axis
On a line through the origin, slanted at 45 degrees
On the horizontal axis (Correct answer)
On the vertical axis

Correct answer: On the horizontal axis

On a Smith chart, the horizontal axis (often called the r-axis) represents purely resistive impedances. Points located on this axis have zero reactance, meaning the impedance is entirely resistive. Moving along this axis from left to right corresponds to increasing resistance, with the center of the chart representing the characteristic impedance (pure resistance).

Question 30: What is the purpose of the phonetic alphabet in ham radio?

To shorten transmissions
To clarify spoken letters (Correct answer)
For secret communication
To replace call signs

Correct answer: To clarify spoken letters

The phonetic alphabet, like Alpha-Bravo-Charlie, is used in ham radio to clarify spoken letters, especially when transmitting call signs or other critical information over noisy or weak radio channels. It helps prevent misinterpretation by providing a distinct word for each letter, improving communication accuracy.

Question 31: What is the minimum age to obtain a Technician Class amateur radio license?

No age limit (Correct answer)
18
16
21

Correct answer: No age limit

There is no minimum age limit to obtain a Technician Class amateur radio license in the United States. Anyone, regardless of age, who can pass the required written examination is eligible to become a licensed amateur radio operator.

Question 32: What is a common cause of RF feedback (RF in the shack) in a station with a coax-fed dipole?

Excessive antenna height above ground
Common-mode current flowing on the outside of the coax shield back into the shack (Correct answer)
Using RG-213 instead of RG-58
Operating the antenna on a harmonic frequency

Correct answer: Common-mode current flowing on the outside of the coax shield back into the shack

When coax is connected directly to an unbalanced dipole without a balun, RF can flow back on the shield outer surface into the operating position.

Question 33: What is the primary purpose of a voltage regulator in a power supply?

Increase the output voltage to a higher level
Maintain a constant output voltage despite input or load changes (Correct answer)
Convert DC voltage to AC voltage
Filter out RF noise from the AC line

Correct answer: Maintain a constant output voltage despite input or load changes

A voltage regulator holds the output voltage steady regardless of input fluctuations or varying load current.

Question 34: What is DCS (Digital Coded Squelch) used for in repeater systems?

Linking repeaters via a digital internet protocol
Automatically identifying the repeater with a digital callsign
Encrypting voice transmissions on digital repeaters
Controlling repeater access using a continuous digital data stream, similar to CTCSS (Correct answer)

Correct answer: Controlling repeater access using a continuous digital data stream, similar to CTCSS

DCS uses a continuous sub-audible digital data stream to control squelch and selectively activate repeaters, functioning similarly to CTCSS but in digital form.

Question 35: What is the main reason amateur radio operators are advised to use a dummy load when testing a new transmitter?

It increases the transmitter's output power during tests
It prevents RF from being radiated and interfering with others or posing a nearby RF exposure hazard (Correct answer)
A dummy load provides better audio quality for testing
It prevents the transmitter from overheating

Correct answer: It prevents RF from being radiated and interfering with others or posing a nearby RF exposure hazard

A dummy load absorbs RF power as heat rather than radiating it, avoiding interference and reducing nearby RF exposure risk.

Amateur Radio Technician Class License Exam

Certifies individuals to operate amateur radio stations with basic privileges, including VHF/UHF frequencies and some HF privileges.

Questions

60 min

Time Limit

74%

To Pass

Checking for saved progress...

Exam Rules

You can skip questions and return to them later
Flag questions for review before submitting
No feedback shown until you submit the entire exam
Unanswered questions count as wrong — answer everything
10 pretest questions are mixed in and don't affect your score
Timer auto-submits when time runs out
Your progress is auto-saved every 30 seconds