Radio Communications Technician Course

Lesson 1 • Radio Frequency Bands and Uses

Introduces the standard RF band designations and their typical applications. 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 predict coverage and link reliability based on propagation mode selection.

Lesson 3 • Electromagnetic Wave Fundamentals

Covers wave properties including frequency, wavelength, amplitude, and phase. 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. 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 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 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 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 assess power requirements and cooling adequacy for field deployments.

Lesson 1 • Analogue Amplitude Modulation

Covers AM, DSB, SSB, and vestigial sideband modulation principles. Students 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 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 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 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 diagnose mismatch and calculate line losses.

Lesson 2 • Antenna Radiation Fundamentals

Covers radiation resistance, efficiency, directivity, and gain for basic antenna types. Students 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 size antennas for target frequencies.

Lesson 4 • Impedance Matching Techniques

Explains L-network, stub matching, and balun use for antenna feed optimisation. Students 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 justify maintenance intervals using reliability data.

Lesson 4 • Maintenance Documentation and Reporting

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