Ham Radio Extra Class Practice Test 2025 - Free Extra Class License Exam Questions and Study Guide

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Which of the following best characterizes digital modes like PSK31?

They use phase-shift keying for data transmission

Digital modes such as PSK31 indeed use phase-shift keying (PSK) for data transmission. PSK is a modulation scheme where data is conveyed by varying the phase of the carrier wave. In the case of PSK31, it is specifically designed for keyboard-to-keyboard communication, making it highly efficient for transmitting text over radio frequencies. This mode allows for effective communication even at low power levels and bandwidth, as it transmits information in a compressed format.

Understanding the propagation characteristics and interaction of digital modes with the radio spectrum enhances their appeal among amateurs, as they can achieve reliable communication over varying distances without the need for specialized infrastructure. This capability distinguishes PSK31 and similar digital modes from communication systems that require different technologies or setups.

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They require a standard phone line for operation

They rely on visual indicators for messaging

They are only usable within a short range

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