UEENEEH172A Communications Systems

Communications Systems Home Page – see side tabs for topics in week order
CARVER M-400A

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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.


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