ARRL Technician Practice Exam

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Prepare for the ARRL Technician Exam. Access flashcards and multiple choice questions with detailed explanations. Get ready to become a certified amateur radio operator!

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What is PSK31?

A low-rate data transmission mode
A high-rate data transmission mode
A voice transmission mode
An analog transmission mode

The correct answer is: A low-rate data transmission mode

PSK31 is a digital mode used for data transmission that is specifically designed for low-rate communications. It utilizes Phase Shift Keying (PSK) modulation, which allows for efficient encoding of data onto a radio signal. This mode is particularly advantageous for ham radio operators who wish to engage in text-based communication over the airwaves without the need for high bandwidth. The significance of PSK31 lies in its ability to transmit messages at a relatively low baud rate while maintaining clarity and reliability in the communication. This low rate makes it suitable for amateur radio use, especially in conditions where radio frequency spectrum is limited or when attempting to communicate over longer distances where lower power levels are preferred to reduce noise and interference. Higher-rate data transmission modes typically require more bandwidth and can be less effective for long-distance communication, especially under challenging conditions. Voice transmission modes and analog modes do not pertain to the digital communication capabilities that PSK31 offers, emphasizing the point that PSK31 is distinctly a digital, low-rate data transmission mode.