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E8C - Signals and Emissions

Extra Class

Digital signals: baud, symbols, FSK, PSK, QAM, forward error correction

14 questions

All E0A E1A E1B E1C E1D E1E E1F E2A E2B E2C E2D E2E E3A E3B E3C E4A E4B E4C E4D E4E E5A E5B E5C E5D E6A E6B E6C E6D E6E E6F E7A E7B E7C E7D E7E E7F E7G E7H E8A E8B E8C E8D E9A E9B E9C E9D E9E E9F E9G E9H
E8C01

What is Quadrature Amplitude Modulation or QAM?
E8C02

What is the definition of symbol rate in a digital transmission?
E8C03

Why should the phase of a PSK signal be changed at the zero crossing of the RF signal?
E8C04

What technique minimizes the bandwidth of a PSK31 signal?
E8C05

What is the approximate bandwidth of a 13-WPM International Morse Code transmission?
E8C06

What is the bandwidth of an FT8 signal?
E8C07

What is the bandwidth of a 4,800-Hz frequency shift, 9,600-baud ASCII FM transmission?
E8C08

How does ARQ accomplish error correction?
E8C09

Which digital code allows only one bit to change between sequential code values?
E8C10

How can data rate be increased without increasing bandwidth?
E8C11

What is the relationship between symbol rate and baud?
E8C12

What factors affect the bandwidth of a transmitted CW signal?
E8C14

What type of addresses do nodes have in a mesh network?
E8C15

What technique do individual nodes use to form a mesh network?