8) This describes the essential skills and knowledge and their level, required for this unit. Evidence shall show that knowledge has been acquired of safe working practices and finding and repairing faults in communication systems. All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies. KS01-EH172A Electronic communications systems troubleshooting ? T1. AM and FM tuners Superheterodyne receivers Operational characteristics and techniques used in AM and FM receivers Frequency modulation, stereo encoding and de-coding used in commercial FM transmissions Amplitude modulation and de-modulation used in commercial AM transmissions RF signal requirements for AM tuners RF signal requirements for stereo FM tuners T2. Modulation and de-modulation AM principles Radio Communications System (Review) Operational characteristics and techniques used in AM Amplitude modulation and de-modulation used in commercial AM transmissions RF signal requirements for AM tuners Modulation Envelope Index and percentage modulation depth Power in carrier and sidebands Over modulation and "splatter" Sideband modulation terminology and techniques Transmissions T3. Sideband modulation terminology and techniques Double-sideband (DSB), Single-sideband (SSB) Frequency domain representation Double-sideband signal (DSB) Single-sideband signal (SSB) Demodulation requirements for DSB and SSBRF Amplifiers T4. IF principles IF principles and operation Intermediate frequency Down converters Amplification The diode demodulator circuit. T5. RF circuits Introduction to RF Amplifiers RF Oscillators (eg, Hartley, Colpitts, Clapp) RF Mixers Attenuators Transmission lines – Impedance matching Terminations T6. Frequency and phase modulation Principles Time and frequency domain representation, amplitude and frequency Frequency modulation (FM) production, Phase modulation (PM) Digital Encoding Spread spectrum Equivalent FM and PM (eg. – audio processing) Bessel function and distribution of sidebands, Modulation Envelope Index and percentage modulation depth Power in carrier and sidebands Over modulation and "splatter" Sideband modulation terminology and techniques Bandwidth T7. Frequency and phase de-modulation Principles FM Demodulation Circuits Frequency synthesizers (eg. PLL) T8. Antennas Principles Half wave/quarter wave configurations Impedance matching networks Polarisation T9. Transmitter and Receiver systems configurations High and low-level AM transmitters High and low-level FM transmitters Transmitter Power ratings Spectral purity (eg. harmonics, spuriousemissions and IMD) T10. RF Filters Types (eg. Butterworth, Chebyshev, Bessel and Elliptical) Crystal filters Mechanical Filters T11. RF Safety and precautions Effects of RF radiation on the human body and work practices to protect against radio frequency radiation. Standards, Codes and Regulations of ACMA regulation for power, frequency and antenna gain and Occupational Health &Safety. |