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 is the approximate bandwidth of a VHF repeater FM phone signal?

5-10 kHz
10-15 kHz
15-20 kHz
20-25 kHz

The correct answer is: 10-15 kHz

The bandwidth of a VHF repeater FM phone signal is typically in the range of 10-15 kHz. This bandwidth allows for the effective transmission of voice signals while maintaining clarity and reducing the potential for interference with adjacent frequencies. In FM (Frequency Modulation), the bandwidth is determined by both the modulation characteristics and the channel spacing required to accommodate multiple users without causing interference. For voice communications, the 10-15 kHz bandwidth efficiently supports the transmission of audio frequencies, which are generally in the range of 300 Hz to 3 kHz, while also allowing for guard bands that help prevent overlap into adjacent channels. Other bandwidth options are wider than the standard requirement for VHF repeater operations, which is why they are less suitable. Thus, 10-15 kHz is the most practical and commonly accepted bandwidth for these types of communications.