Which types of modulation are used for amateur television DVB-T signals?
The correct answer is B: QAM and QPSK. Which types of modulation are used for amateur television DVB-T signals are QAM and QPSK. DVB-T (Digital Video Broadcasting - Terrestrial) uses QAM and QPSK modulation. For amateur radio operators, this is important for digital TV operation. Understanding this helps when operating digital TV.
Exam Tip
DVB-T modulation = QAM and QPSK. Think 'D'VB-'T' = 'D'igital 'T'V uses 'Q'AM/'Q'PSK. DVB-T (Digital Video Broadcasting - Terrestrial) uses QAM and QPSK modulation. Not FM/FSK, not AM/OOK - just QAM and QPSK.
Memory Aid
"DVB-T modulation = QAM and QPSK. Think 'D'VB-'T' = 'Q'AM/'Q'PSK. DVB-T (Digital Video Broadcasting - Terrestrial) uses QAM and QPSK modulation. Important for digital TV operation."
Real-World Application
Amateur television DVB-T signals: They use QAM (Quadrature Amplitude Modulation) and QPSK (Quadrature Phase Shift Keying) modulation. These are digital modulation schemes used for digital television. DVB-T is the standard for digital terrestrial TV. This is what modulation types are used - QAM and QPSK.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. FM and FSK aren't used for DVB-T - DVB-T uses QAM and QPSK. FM/FSK isn't used.
Option C: Incorrect. AM and OOK aren't used for DVB-T - DVB-T uses QAM and QPSK. AM/OOK isn't used.
Option D: Incorrect. Since A and C are not correct, 'all of the above' cannot be correct. Only QAM and QPSK are used.
题目解析
The correct answer is B: QAM and QPSK. Which types of modulation are used for amateur television DVB-T signals are QAM and QPSK. DVB-T (Digital Video Broadcasting - Terrestrial) uses QAM and QPSK modulation. For amateur radio operators, this is important for digital TV operation. Understanding this helps when operating digital TV.
考试技巧
DVB-T modulation = QAM and QPSK. Think 'D'VB-'T' = 'D'igital 'T'V uses 'Q'AM/'Q'PSK. DVB-T (Digital Video Broadcasting - Terrestrial) uses QAM and QPSK modulation. Not FM/FSK, not AM/OOK - just QAM and QPSK.
记忆口诀
DVB-T modulation = QAM and QPSK. Think 'D'VB-'T' = 'Q'AM/'Q'PSK. DVB-T (Digital Video Broadcasting - Terrestrial) uses QAM and QPSK modulation. Important for digital TV operation.
实际应用示例
Amateur television DVB-T signals: They use QAM (Quadrature Amplitude Modulation) and QPSK (Quadrature Phase Shift Keying) modulation. These are digital modulation schemes used for digital television. DVB-T is the standard for digital terrestrial TV. This is what modulation types are used - QAM and QPSK.
错误选项分析
Option A: Incorrect. FM and FSK aren't used for DVB-T - DVB-T uses QAM and QPSK. FM/FSK isn't used. Option C: Incorrect. AM and OOK aren't used for DVB-T - DVB-T uses QAM and QPSK. AM/OOK isn't used. Option D: Incorrect. Since A and C are not correct, 'all of the above' cannot be correct. Only QAM and QPSK are used.
知识点
Amateur television, DVB-T signals, QAM, QPSK
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.