Requirement 4 of 9
Information by Radio
Explain how radio carries information through analog and digital methods and compare range and data-rate differences.
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Checklist
- 4a Explain CW, AM, FM, SSB, and frequency hoppingNot complete
- 4b Explain how Bluetooth, Wi-Fi, and 5G improve reliability compared with analog standardsNot complete
- 4c Explain how effective range varies for different encoding methodsNot complete
- 4d Compare Wi-Fi data rates with hard-wired or fiber-optic systemsNot complete
Requirement 4 discussion guide
Use these notes to explain several common ways radio systems carry voice or data.
Encoding information
Analog and digital methods
- CW Morse code sends information by turning a carrier on and off in patterns.
- AM varies signal amplitude, FM varies frequency, and SSB sends a more bandwidth-efficient voice signal.
- Frequency hopping rapidly changes frequencies in a planned pattern to improve resistance to interference and sharing.
- Digital systems such as Bluetooth, Wi-Fi, and 5G use coded data handling, error correction, and other methods that can improve reliability.
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Digital radio reliability
Explain why modern digital standards can be more reliable than many analog standards.
Points to cover
- Digital systems can include error correction, packet handling, and more advanced ways to reject noise or recover data.
- Bluetooth, Wi-Fi, and 5G can adapt data handling to changing conditions better than many simple analog systems.
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Range differences
Explain why different encoding methods do not all have the same practical range.
Why range changes
- Power, antenna design, frequency, bandwidth, environment, and receiver sensitivity all matter.
- Some methods favor long-distance weak-signal work, while others favor higher data rate over shorter distances.
Range differences locked
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Wi-Fi vs wired and fiber
Compare typical Wi-Fi data rates with hard-wired and fiber-optic systems.
Basic comparison
- Wi-Fi can be fast and convenient, but speed can vary because of distance, walls, interference, and device sharing.
- Hard-wired and especially fiber-optic systems usually offer more stable high-speed performance over fixed links.
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