What is an ARQ transmission system?
The correct answer is C: An error correction method in which the receiving station detects errors and sends a request for retransmission. An ARQ transmission system is an error correction method where the receiving station detects errors and sends a request for retransmission. ARQ stands for Automatic Repeat Request. When the receiver detects an error (typically through a checksum), it automatically requests the sender to retransmit the data. This ensures reliable data transmission. For amateur radio operators, ARQ is used in packet radio and other digital modes to ensure error-free data transfer. Understanding ARQ helps explain how digital modes achieve reliability.
Exam Tip
ARQ = Automatic Repeat Request = error correction. Think 'A'RQ = 'A'utomatic 'R'epeat 'Q'uery. Receiver detects errors and requests retransmission. Not limited to video, not encryption, not compression.
Memory Aid
"ARQ = Automatic Repeat Request. Think 'A'RQ = 'A'utomatic 'R'epeat 'Q'uery. Error correction method where receiver requests retransmission when errors are detected. Ensures reliable data transmission."
Real-World Application
You send a packet radio message. The receiving station checks the data using the checksum and detects an error. The ARQ system automatically sends a request back to you to retransmit the packet. You retransmit, and this time it's received correctly. ARQ ensures reliable data transfer by automatically handling retransmissions when errors occur.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. ARQ isn't limited to video signals - it's used for all types of digital data transmission, including text, telemetry, and other data.
Option B: Incorrect. ARQ isn't for encrypting command signals - it's an error correction method, not an encryption system. Encryption is separate from error correction.
Option D: Incorrect. ARQ isn't a data compression method using Q codes - it's an error correction protocol, not compression. Q codes are abbreviations, not compression algorithms.
题目解析
The correct answer is C: An error correction method in which the receiving station detects errors and sends a request for retransmission. An ARQ transmission system is an error correction method where the receiving station detects errors and sends a request for retransmission. ARQ stands for Automatic Repeat Request. When the receiver detects an error (typically through a checksum), it automatically requests the sender to retransmit the data. This ensures reliable data transmission. For amateur radio operators, ARQ is used in packet radio and other digital modes to ensure error-free data transfer. Understanding ARQ helps explain how digital modes achieve reliability.
考试技巧
ARQ = Automatic Repeat Request = error correction. Think 'A'RQ = 'A'utomatic 'R'epeat 'Q'uery. Receiver detects errors and requests retransmission. Not limited to video, not encryption, not compression.
记忆口诀
ARQ = Automatic Repeat Request. Think 'A'RQ = 'A'utomatic 'R'epeat 'Q'uery. Error correction method where receiver requests retransmission when errors are detected. Ensures reliable data transmission.
实际应用示例
You send a packet radio message. The receiving station checks the data using the checksum and detects an error. The ARQ system automatically sends a request back to you to retransmit the packet. You retransmit, and this time it's received correctly. ARQ ensures reliable data transfer by automatically handling retransmissions when errors occur.
错误选项分析
Option A: Incorrect. ARQ isn't limited to video signals - it's used for all types of digital data transmission, including text, telemetry, and other data. Option B: Incorrect. ARQ isn't for encrypting command signals - it's an error correction method, not an encryption system. Encryption is separate from error correction. Option D: Incorrect. ARQ isn't a data compression method using Q codes - it's an error correction protocol, not compression. Q codes are abbreviations, not compression algorithms.
知识点
ARQ, Automatic Repeat Request, Error correction, Digital communications
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.