Digital Radio Specialist Course

Lesson 1 • Analog vs. Digital Radio Fundamentals

Contrasts analog and digital signal characteristics, modulation types, and noise behaviour. Establishes the baseline vocabulary used throughout the course.

Lesson 2 • Digital Modulation Techniques

Introduces FSK, PSK, QAM, and OFDM modulation schemes and their trade-offs. Provides the technical basis for understanding digital radio waveforms.

Lesson 3 • Digital Radio System Architecture

Maps the functional blocks of a digital radio: source coding, channel coding, modulator, and RF front end. Prepares students to analyse complete signal chains.

Lesson 4 • Key Performance Metrics

Defines bit error rate, spectral efficiency, latency, and link budget as measurable outcomes. Students use these metrics to evaluate system performance.

Lesson 1 • Overview of Major Digital Standards

Surveys DMR, P25, TETRA, NXDN, and dPMR standards at a functional level. Establishes a comparative framework used in later sections.

Lesson 2 • DMR Protocol Deep Dive

Examines DMR Tier I, II, and III architecture, time-division multiple access, and call types. Builds the detailed protocol knowledge needed for DMR deployment.

Lesson 3 • P25 Protocol Deep Dive

Details P25 Phase I FDMA and Phase II TDMA, IMBE/AMBE vocoder operation, and inter-agency interoperability. Prepares students for public-safety radio environments.

Lesson 4 • Protocol Selection and Interoperability

Provides a decision framework for matching standards to operational requirements and budget. Addresses gateway and cross-protocol interoperability solutions.

Lesson 1 • Equipment Testing and Acceptance

Introduces RF power output, frequency accuracy, and audio quality acceptance tests. Ensures students can verify equipment meets specifications before deployment.

Lesson 2 • Base Stations and Repeaters

Covers base-station architecture, duplexers, combiners, and repeater controller functions. Connects infrastructure hardware to network coverage design.

Lesson 3 • Radio Programming and Configuration

Walks through codeplug structure, channel programming, and radio-specific software tools. Students leave able to program a radio for a defined operational profile.

Lesson 4 • Portable and Mobile Radio Anatomy

Identifies internal and external components of handheld and vehicle-mounted digital radios. Builds the hardware literacy needed for configuration and troubleshooting.

Lesson 1 • Repeater and Tower Site Engineering

Covers tower types, structural loading, equipment shelter design, and site safety standards. Connects physical infrastructure to RF system performance.

Lesson 2 • Network Design Documentation

Guides students through producing RF coverage maps, equipment lists, and network diagrams. Documentation skills ensure designs are reproducible and auditable.

Lesson 3 • Coverage Planning and Site Surveys

Applies propagation modelling, terrain analysis, and field measurement to determine site placement. Accurate site surveys are the foundation of reliable coverage.

Lesson 4 • Trunked System Architecture

Details trunked radio system controllers, site controllers, and channel grant mechanisms. Students understand how trunking maximises spectrum efficiency.

Lesson 1 • Integrated Voice and Data Applications

Deploys combined voice, data, and location applications on a single radio channel. Students configure and test a complete integrated service profile.

Lesson 2 • GPS and Location Services

Integrates GPS reporting, location update intervals, and dispatch map display into radio systems. Location awareness improves situational awareness for field teams.

Lesson 3 • Digital Voice Codec Operation

Explains vocoder compression, voice quality metrics, and codec selection for different environments. Codec choice directly affects intelligibility and bandwidth use.

Lesson 4 • Talkgroup and Call Management

Covers talkgroup hierarchy, dynamic regrouping, emergency calls, and priority queuing. Proper call management ensures critical communications are never blocked.

Lesson 1 • Radio Security Threat Landscape

Identifies eavesdropping, rogue transmitters, replay attacks, and denial-of-service threats. Understanding threats drives appropriate security control selection.

Lesson 2 • Encryption Standards for Digital Radio

Covers AES-256, DES, and proprietary encryption options available in major digital standards. Students select appropriate encryption strength for their operational context.

Lesson 3 • Authentication and Access Control

Configures radio authentication, individual radio inhibit, and user PIN controls. Access control prevents unauthorised use of radio infrastructure.

Lesson 4 • Security Policy and Compliance

Develops a radio security policy covering encryption mandates, key handling, and incident response. Policy alignment ensures consistent security across the organisation.

Lesson 1 • System Configuration and Integration

Loads system software, configures IP addresses, and integrates site controllers with the network. Integration steps connect individual components into a working system.

Lesson 2 • Commissioning Tests and Verification

Executes RF coverage drive tests, call processing tests, and data service verification. Commissioning tests confirm the system meets the design specification.

Lesson 3 • Pre-Installation Planning

Produces installation drawings, cable schedules, and risk assessments before site work begins. Thorough planning reduces installation errors and rework.

Lesson 4 • Handover and As-Built Documentation

Compiles as-built drawings, test reports, and user guides for formal system handover. Complete documentation supports future maintenance and upgrades.

Lesson 1 • Audio and Voice Quality Issues

Diagnoses codec errors, audio clipping, background noise, and vocoder artefacts affecting intelligibility. Voice quality directly impacts user confidence in the system.

Lesson 2 • RF Layer Fault Diagnosis

Diagnoses interference, antenna faults, feedline loss, and intermodulation distortion at the RF layer. RF faults are the most common cause of coverage degradation.

Lesson 3 • Network and Protocol Fault Diagnosis

Isolates IP backhaul failures, site controller faults, and call-processing errors using log analysis. Network-layer faults often manifest as intermittent call failures.

Lesson 4 • Performance Optimisation Techniques

Applies antenna tilt, power adjustment, frequency reuse, and parameter tuning to improve KPIs. Optimisation converts a functional system into a high-performing one.