Radio Communications Technician Course

Lesson 1 • Radio Frequency Bands and Uses

Introduces the standard RF band designations and their typical applications. It connects band characteristics to equipment selection and operational planning.

Lesson 2 • Signal Propagation Principles

Explains ground wave, sky wave, and line-of-sight propagation modes. Students will predict coverage and link reliability based on propagation mode selection.

Lesson 3 • Electromagnetic Wave Fundamentals

Covers wave properties including frequency, wavelength, amplitude, and phase. It establishes the physical basis for all subsequent radio theory in the course.

Lesson 4 • Noise, Interference, and Signal Quality

Defines thermal noise, signal-to-noise ratio, and common interference sources. It prepares students to diagnose degraded links and apply mitigation strategies.

Lesson 1 • Transmitter Subsystems

Covers oscillator, modulator, amplifier, and filter stages in a transmitter chain. Students will trace signal generation from baseband audio to RF output.

Lesson 2 • Frequency Synthesis and Control

Introduces phase-locked loop synthesisers and direct digital synthesis. Students will relate synthesiser design to frequency accuracy and switching speed.

Lesson 3 • Receiver Subsystems

Explains superheterodyne architecture including RF front end, mixer, IF stages, and detector. Students will identify each stage's role in signal recovery.

Lesson 4 • Power Supply and Thermal Management

Covers regulated DC supplies, battery systems, and heat dissipation in radio equipment. Students will assess power requirements and cooling adequacy for field deployments.

Lesson 1 • Analogue Amplitude Modulation

Covers AM, DSB, SSB, and vestigial sideband modulation principles. Students will calculate bandwidth, power efficiency, and sideband structure for each variant.

Lesson 2 • Spread Spectrum Techniques

Covers direct sequence and frequency hopping spread spectrum operation and benefits. Students will explain processing gain, jamming resistance, and covert operation advantages.

Lesson 3 • OFDM and Modern Waveforms

Explains orthogonal frequency division multiplexing subcarrier structure and cyclic prefix. Students will relate OFDM to multipath resilience and modern broadband radio systems.

Lesson 4 • Digital Modulation Fundamentals

Introduces ASK, FSK, PSK, and QAM constellations and their spectral properties. Students will map modulation order to bit rate, bandwidth, and required SNR.

Lesson 1 • Transmission Line Theory

Covers characteristic impedance, standing wave ratio, and reflection coefficient for coaxial and parallel lines. Students will diagnose mismatch and calculate line losses.

Lesson 2 • Antenna Radiation Fundamentals

Covers radiation resistance, efficiency, directivity, and gain for basic antenna types. Students will calculate effective radiated power and interpret radiation patterns.

Lesson 3 • Dipole and Monopole Antennas

Examines half-wave dipole and quarter-wave monopole design, feed impedance, and ground plane effects. Students will size antennas for target frequencies.

Lesson 4 • Impedance Matching Techniques

Explains L-network, stub matching, and balun use for antenna feed optimisation. Students will apply matching techniques to minimise SWR and maximise power transfer.

Lesson 1 • Radio Equipment Configuration

Explains frequency programming, power level setting, and squelch adjustment for operational readiness. Students will configure a radio set to a given communications plan.

Lesson 2 • Site Survey and Link Planning

Covers terrain analysis, Fresnel zone clearance, and path loss estimation for site selection. Students will produce a link budget and site plan for a given scenario.

Lesson 3 • Grounding, Bonding, and EMC Compliance

Covers equipment grounding, bonding straps, and electromagnetic compatibility requirements for installations. Students will verify grounding integrity and identify EMC violation risks.

Lesson 4 • Coaxial Cable Routing and Termination

Covers cable selection, weatherproofing, connector installation, and bend radius limits. Students will terminate and test coaxial runs to verify low insertion loss.

Lesson 1 • Spectrum Analyser Operation

Explains span, resolution bandwidth, reference level, and marker functions on a spectrum analyser. Students will identify spurious emissions and measure occupied bandwidth.

Lesson 2 • SWR and Antenna Analyser Techniques

Introduces antenna analysers and vector network analysers for impedance and SWR measurement. Students will tune antennas and transmission lines to target impedance.

Lesson 3 • Power Meter and Wattmeter Use

Covers directional wattmeter, inline power sensor, and peak power measurement techniques. Students will measure forward and reflected power to calculate SWR.

Lesson 4 • Multimeter and Oscilloscope Use

Covers DC and AC measurements, waveform capture, and trigger setup on bench instruments. Students will measure voltage, current, and signal timing in radio circuits.

Lesson 1 • Troubleshooting Methodology

Introduces symptom analysis, fault isolation by half-split, and hypothesis testing. Students will apply a structured process to reduce diagnostic time and avoid misdiagnosis.

Lesson 2 • Receiver Fault Diagnosis

Addresses desensitisation, poor selectivity, audio distortion, and squelch malfunction in receivers. Students will use signal injection to locate the defective stage.

Lesson 3 • Antenna and Feedline Fault Diagnosis

Covers open circuit, short circuit, water ingress, and connector corrosion faults in antenna systems. Students will use TDR and SWR measurements to locate feedline faults.

Lesson 4 • Transmitter Fault Diagnosis

Covers no-output, low-power, spurious emission, and frequency error faults in transmitters. Students will trace signal flow to isolate the defective stage.

Lesson 1 • Scheduled Inspection Procedures

Details visual inspection, connector cleaning, torque verification, and firmware update checks. Students will execute a complete inspection checklist on a radio system.

Lesson 2 • Alignment and Calibration Procedures

Covers transmitter power, frequency, and modulation alignment using test equipment. Students will restore equipment to factory specification through systematic calibration steps.

Lesson 3 • Preventive Maintenance Concepts

Covers reliability theory, mean time between failures, and the cost-benefit basis for scheduled maintenance. Students will justify maintenance intervals using reliability data.

Lesson 4 • Maintenance Documentation and Reporting

Explains work order systems, equipment history logs, and reliability trend reporting. Students will complete maintenance documentation that supports operational readiness decisions.