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Data communication systems
This option topic links signals to communication technologies.
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Objectives
10
Flashcards
10
Questions
90 min
Study time
AqaA LevelPhysicsElectronics
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Principles of communication systems4 objectives
- Identify the main parts of a communication system.
- Explain the roles of transmitter, channel and receiver.
- Discuss bandwidth and noise limitations.
- Compare analogue and digital communication qualitatively.
Transmission media4 objectives
- Compare common transmission media.
- Explain attenuation and signal loss.
- Discuss bandwidth and interference for different media.
- Select suitable transmission media for contexts.
Time-division multiplexing4 objectives
- Describe the principle of time-division multiplexing.
- Explain why synchronisation is needed.
- Interpret simple multiplexing timing diagrams.
- Discuss advantages of multiplexing in communication systems.
Amplitude and frequency modulation4 objectives
- Describe the purpose of modulation.
- Distinguish amplitude modulation from frequency modulation.
- Interpret modulated signal diagrams.
- Compare advantages and limitations of AM and FM.
Key terms
TransmitterChannelReceiverBandwidthNoiseSignal‑to‑Noise Ratio (SNR)Copper wireFiber optic cableWireless radioInterferenceSignal AttenuationSignal attenuation
Exam tips
- Principles of communication systems: circuit reasoning tip: Link name the input, component response, and output consequence when answering Principles of communication systems electronics questions.
- Link each part to a real‑world example: Associate the transmitter with a radio, the channel with the airwaves, and the receiver with a radio set; then describe how each component transforms or carries the signal.
Common mistakes
- Channel mistaken for receiver: Rule: In a communication system, the channel is the medium that carries the signal, while the receiver is the device that receives and decodes the signal. Substitution: channel = medium, receiver = device. Working: The channel does not process the signal; it only transmits it. Answer: The channel is not the receiver. Conclusion: Identify the channel as the medium and the receiver as the decoding device.
- Transmitter omitted: Rule: The transmitter is the source that converts information into a signal for transmission. Substitution: transmitter = source of signal, receiver = device that decodes, channel = medium. Working: Without a transmitter, no signal is generated to be sent through the channel. Answer: The transmitter is a main part of the system. Conclusion: Always include transmitter, channel, and receiver as the three main parts.
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