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US_TECH_2022_2026

Technician 2022-2026 - Practical circuits, troubleshooting, and measurements

Practical circuits, troubleshooting, and measurements groups the T7 section questions for focused review and easier weak-point tracking.

43
Questions
9
Sibling Topics
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Pool
Technician 2022-2026
Questions
43
Topic
Practical circuits, troubleshooting, and measurements
Region
US
Read the condition in the stem before comparing key terms in the options.
Study rules, calculations, and equipment questions as separate patterns.
After this topic, return to the full pool for mixed practice.

Topic Study Guide

This topic covers basic concepts of practical radio circuits, equipment functions, and troubleshooting/measurement methods. The focus is on distinguishing circuit modules and mastering the principles of resolving Radio Frequency Interference (RFI).

High-Yield Checks

  • Receiver characteristics: Sensitivity detects weak signals, while Selectivity discriminates between multiple signals.
  • Core circuit functions: An Oscillator generates a signal, a Mixer converts frequency, and Modulation combines speech with an RF carrier.
  • Interference troubleshooting: Fundamental overload is usually due to poor receiver filtering and should be fixed by installing a filter at the affected receiver's antenna input.
  • Causes of distorted audio: Can be RF feedback, low batteries, off-frequency operation, or talking too close to the microphone (causing over-deviation).

Trap Patterns

  • Confusing a Transceiver (combines Rx/Tx) with a Transverter (converts frequency bands).
  • Mistakenly believing an RF preamplifier fixes receiver overload; it actually amplifies the interference and makes it worse.
  • Rushing to install filters for cable TV interference, forgetting that the first step is to ensure all coaxial connectors are properly installed.

Review Steps

  • Compare circuit components: Make a table of oscillators, mixers, modulators, and amplifiers, focusing on their action verbs (generate, convert, combine, increase).
  • Master the interference resolution flow: Start by checking your own station, then physical connections (like connectors), and finally add filters or ferrite chokes.
  • Distinguish Tx and Rx paths: Clarify the installation locations of preamplifiers (receive side) versus power amplifiers (transmit side).

Quick Checks

  • What specific abilities of a receiver do Sensitivity and Selectivity determine, respectively?
  • Where is the best location to fix fundamental overload on a non-amateur receiver?
  • What is the functional difference between a Mixer and a Transverter?
  • What problem does RF current on a microphone cable shield cause, and how is it resolved?

Questions in This Topic

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T7A01Which term describes the ability of a receiver to detect the presence of a signal?T7A02What is a transceiver?T7A03Which of the following is used to convert a signal from one frequency to another?T7A04Which term describes the ability of a receiver to discriminate between multiple signals?T7A05What is the name of a circuit that generates a signal at a specific frequency?T7A06What device converts the RF input and output of a transceiver to another band?T7A07What is the function of a transceiver’s PTT input?T7A08Which of the following describes combining speech with an RF carrier signal?T7A09What is the function of the SSB/CW-FM switch on a VHF power amplifier?T7A10What device increases the transmitted output power from a transceiver?T7A11Where is an RF preamplifier installed?T7B01What can you do if you are told your FM handheld or mobile transceiver is over-deviating?T7B02What would cause a broadcast AM or FM radio to receive an amateur radio transmission unintentionally?T7B03Which of the following can cause radio frequency interference?T7B04Which of the following could you use to cure distorted audio caused by RF current on the shield of a microphone cable?T7B05How can fundamental overload of a non-amateur radio or TV receiver by an amateur signal be reduced or eliminated?T7B06Which of the following actions should you take if a neighbor tells you that your station’s transmissions are interfering with their radio or TV reception?T7B07Which of the following can reduce overload of a VHF transceiver by a nearby commercial FM station?T7B08What should you do if something in a neighbor’s home is causing harmful interference to your amateur station?T7B09What should be the first step to resolve non-fiber optic cable TV interference caused by your amateur radio transmission?T7B10What might be a problem if you receive a report that your audio signal through an FM repeater is distorted or unintelligible?T7B11What is a symptom of RF feedback in a transmitter or transceiver?T7C01What is the primary purpose of a dummy load?T7C02Which of the following is used to determine if an antenna is resonant at the desired operating frequency?T7C03What does a dummy load consist of?T7C04What reading on an SWR meter indicates a perfect impedance match between the antenna and the feed line?T7C05Why do most solid-state transmitters reduce output power as SWR increases beyond a certain level?T7C06What does an SWR reading of 4:1 indicate?T7C07What happens to power lost in a feed line?T7C08Which instrument can be used to determine SWR?T7C09Which of the following causes failure of coaxial cables?T7C10Why should the outer jacket of coaxial cable be resistant to ultraviolet light?T7C11What is a disadvantage of air core coaxial cable when compared to foam or solid dielectric types?T7D01Which instrument would you use to measure electric potential?T7D02How is a voltmeter connected to a component to measure applied voltage?T7D03When configured to measure current, how is a multimeter connected to a component?T7D04Which instrument is used to measure electric current?T7D06Which of the following can damage a multimeter?T7D07Which of the following measurements are made using a multimeter?T7D08Which of the following types of solder should not be used for radio and electronic applications?T7D09What is the characteristic appearance of a cold tin-lead solder joint?T7D10What reading indicates that an ohmmeter is connected across a large, discharged capacitor?T7D11Which of the following precautions should be taken when measuring in-circuit resistance with an ohmmeter?

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