ACMA Advanced Amateur Radio Theory study guide
ACMA Advanced Amateur Radio Theory · Work through your exam, one topic at a time.
The Advanced Amateur Operator Certificate of Proficiency (theory) is the Australian qualification that sits above the Standard licence and unlocks the full amateur bands and higher power limits. It suits operators who have outgrown the Foundation and Standard privileges and want access to all HF segments, more modes, and the technical depth needed to build and repair their own equipment. The ACMA Advanced Amateur Radio Theory study guide has 8 sections and about 2,462 words.
01Radio and Electronics Fundamentals: Units, Decibels, AC/DC Circuits, Components, Resonance and Filters
Candidates must be fluent with SI prefixes and derived units: the volt, ampere, ohm, watt, farad, henry and hertz, and compound forms such as volts per metre for field strength. Know the relationships P = VI, V = IR, and the impedance forms of reactance: X L = 2πfL and X C = 1/(2πfC).
333 words, about 2 min02Semiconductor Devices, Amplifiers, Oscillators and Power Supplies
Know diode behaviour: forward conduction above roughly 0.6–0.7 V for silicon, reverse blocking, Zener regulation in reverse breakdown, and varactor capacitance variation with reverse bias. Bipolar transistors are current-controlled (gain hFE, base-emitter drop near 0.7 V); FETs are voltage-controlled with high input impedance.
296 words, about 1 min03Transmitters: Architecture, Stages, Keying and Output Systems
A transmitter typically comprises an oscillator, buffer, frequency multipliers or PLL synthesiser, driver, power amplifier, low-pass filter and antenna matching. Know that buffers isolate the oscillator from load changes, multipliers produce harmonics deliberately, and the final low-pass filter removes harmonics before the antenna.
275 words, about 1 min04Receivers, Transceivers and Signal Processing
Know the superheterodyne principle: mixing converts RF to a fixed intermediate frequency where filtering and gain are easier. The image frequency is separated from the wanted signal by twice the IF, so a higher IF or a preselector improves image rejection.
267 words, about 1 min05Transmission Lines, Antennas, Propagation and Feedline Systems
Know characteristic impedance (50 Ω common, 75 Ω for video), velocity factor, and that SWR arises from mismatch. Reflection coefficient Γ = (Z L − Z 0)/(Z L + Z 0), and SWR = (1+ Γ )/(1− Γ ).
265 words, about 1 min06Modulation, Demodulation and Modes: CW, SSB, FM and Digital
AM varies carrier amplitude; total power includes carrier plus sidebands, and the modulation index must stay below 1 to avoid overmodulation. SSB transmits one sideband, saving power and bandwidth; it needs a carrier reinsertion (BFO) at the receiver.
252 words, about 1 min07Measurements, Test Equipment and Interference Suppression
Know the multimeter, RF power meter, directional wattmeter, dummy load, oscilloscope, signal generator, spectrum analyser and antenna analyser. A directional wattmeter reads forward and reflected power; reflected power is not simply SWR but relates through the reflection coefficient.
251 words, about 1 min08Electromagnetic Compatibility, EMC and RF Exposure Safety
EMC has two sides: emission (what your station radiates or conducts) and immunity (how equipment resists it). Interference paths are conducted (mains, cables) and radiated (free space).
523 words, about 3 min