ARRL Technician Practice Exam

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Prepare for the ARRL Technician Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

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What emission modes are allowed in the mode-restricted sub-bands at 50.0 to 50.1 MHz and 144.0 to 144.1 MHz?

SSB only
CW only
FM and AM
A mix of all modes

The correct answer is: CW only

The correct answer is based on the regulations that govern amateur radio operations within specific frequency bands. For the mode-restricted sub-bands at frequencies 50.0 to 50.1 MHz and 144.0 to 144.1 MHz, only Continuous Wave (CW) emissions are permitted. This restriction is primarily in place to promote effective communication standards and minimize interference within these bands, which are designated for specific types of operations, particularly weak signal communication that CW can accommodate well. CW is a favored mode in these regions for its efficiency in lower signal conditions, making it an essential mode for amateur radio operators working in these frequencies. Other modes such as Single Sideband (SSB), Frequency Modulation (FM), and Amplitude Modulation (AM) are not permitted in these restricted sub-bands, which further establishes the focused and intentional use of CW for communication purposes in these specific frequency ranges.