Radio Technician Course

Lesson 1 • Electromagnetic Wave Fundamentals

Covers wave properties including frequency, wavelength, amplitude, and phase. Establishes the physical basis for all radio signal behaviour studied throughout the course.

Lesson 2 • Radio Frequency Bands and Uses

Examines the classification of RF bands from VLF through EHF and their practical applications. Connects frequency selection to real-world communication system design.

Lesson 3 • Core Radio System Components

Introduces transmitters, receivers, antennas, and feedlines as a system. Provides a conceptual map of how each component contributes to a complete radio link.

Lesson 4 • Signal Propagation Modes

Explains ground wave, sky wave, and line-of-sight propagation. Students gain the ability to predict signal behaviour based on frequency and environmental conditions.

Lesson 1 • Filters and Impedance Matching

Introduces low-pass, high-pass, band-pass, and notch filter topologies and impedance matching techniques. These skills are applied directly in antenna systems and signal processing stages.

Lesson 2 • Capacitors and Inductors in Circuits

Examines energy storage, reactance, and time constants for capacitors and inductors. These components are central to filtering and tuning circuits in radio equipment.

Lesson 3 • DC Circuit Analysis

Applies Ohm's Law and Kirchhoff's Laws to series, parallel, and combination circuits. Provides the analytical foundation required for understanding power supply and bias circuits.

Lesson 4 • AC Circuit Fundamentals

Covers sinusoidal waveforms, RMS values, and phase relationships in AC circuits. Directly supports analysis of audio and RF signal paths in radio transceivers.

Lesson 1 • Bipolar and Field-Effect Transistors

Examines BJT and FET operation, biasing, and small-signal amplification. Transistors are the active elements in amplifiers, oscillators, and switching circuits in radio systems.

Lesson 2 • Passive Component Identification and Testing

Covers resistors, capacitors, and inductors including colour codes, tolerances, and multimeter testing. Accurate component identification is prerequisite to all circuit troubleshooting tasks.

Lesson 3 • Power Supply Circuits

Covers rectification, filtering, regulation, and protection in DC power supplies for radio equipment. Reliable power supply operation is critical to overall radio system performance.

Lesson 4 • Integrated Circuits in Radio Equipment

Introduces op-amps, voltage regulators, and RF-specific ICs used in modern radio designs. Understanding IC function enables efficient diagnosis and replacement during equipment servicing.

Lesson 1 • Demodulation and Detection Circuits

Covers envelope detectors, discriminators, PLL demodulators, and digital decoders. Demodulation circuit knowledge is essential for receiver alignment and signal quality assessment.

Lesson 2 • Frequency and Phase Modulation

Examines FM deviation, modulation index, Carson's rule bandwidth, and PM relationships. FM is used in VHF/UHF voice systems and requires deviation measurement skills.

Lesson 3 • Amplitude Modulation Principles

Explains AM waveform generation, modulation index, sidebands, and bandwidth. AM analysis skills are applied to broadcast receivers and single-sideband communication systems.

Lesson 4 • Single-Sideband and DSB Techniques

Covers SSB generation using filter and phasing methods, power efficiency, and audio quality. SSB is the dominant mode in HF voice communication and requires precise tuning skills.

Lesson 1 • Receiver Sensitivity and Selectivity

Covers noise figure, sensitivity specifications, adjacent channel rejection, and dynamic range. These parameters determine receiver performance in congested or weak-signal environments.

Lesson 2 • Transceiver Integration and Control

Examines how transmit and receive paths share components in a transceiver and how microcontrollers manage frequency and mode. Integration knowledge supports full-system troubleshooting.

Lesson 3 • RF Amplifier Stages

Examines small-signal RF amplifiers, driver stages, and power amplifier classes A through C. Amplifier class selection determines efficiency and linearity tradeoffs in transmitter design.

Lesson 4 • Superheterodyne Receiver Design

Explains the superheterodyne architecture including RF stage, mixer, IF amplifier, and AGC. This architecture underlies the majority of professional and amateur radio receivers in service.

Lesson 1 • Transmission Line Theory

Explains characteristic impedance, velocity factor, standing waves, and reflection coefficient. Transmission line behaviour directly affects power transfer efficiency between radio and antenna.

Lesson 2 • Common Antenna Types and Design

Examines half-wave dipoles, verticals, Yagi-Uda arrays, and loop antennas with design formulas. Students apply these formulas to cut and configure antennas for target frequencies.

Lesson 3 • Antenna Theory and Radiation Patterns

Covers dipole radiation, gain, directivity, polarisation, and radiation resistance. Understanding these parameters is prerequisite to selecting and positioning antennas for specific applications.

Lesson 4 • SWR Measurement and Matching

Covers SWR meter operation, acceptable SWR limits, and antenna tuner use. Proper SWR management protects transmitter finals and maximises radiated power.

Lesson 1 • Systematic Fault Isolation Methods

Applies half-split, signal injection, and signal tracing techniques to isolate faults in radio equipment. A structured approach reduces diagnostic time and prevents secondary damage during repair.

Lesson 2 • RF Signal Generators and Spectrum Analysers

Explains signal generator output levels, modulation settings, and spectrum analyser span and resolution bandwidth. These instruments are essential for aligning receivers and verifying transmitter spectral purity.

Lesson 3 • Multimeter and Oscilloscope Operation

Covers DC and AC voltage, current, resistance, and continuity measurements with digital multimeters and oscilloscopes. Proficiency with these instruments underpins all electronic troubleshooting tasks.

Lesson 4 • Power Meters and Dummy Loads

Covers RF wattmeter operation, directional coupler use, and dummy load specifications for safe transmitter testing. Accurate power measurement is required for regulatory compliance and equipment protection.

Lesson 1 • Preventive Maintenance Procedures

Establishes scheduled inspection, cleaning, connector re-torquing, and performance logging routines. Consistent preventive maintenance extends equipment life and prevents unplanned service outages.

Lesson 2 • Equipment Rack and Cabling Installation

Explains rack mounting, cable management, connector termination, and labelling standards for professional installations. Neat, documented installations reduce maintenance time and minimise signal integrity issues.

Lesson 3 • Antenna Mast and Tower Work

Covers mast selection, guying, earthing, and antenna mounting procedures for safe elevated installations. Structural and safety requirements must be met before any antenna system is commissioned.

Lesson 4 • System Alignment and Commissioning

Applies transmitter power, frequency, and deviation checks along with receiver sensitivity verification at commissioning. Documented alignment results provide a baseline for future maintenance comparisons.