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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Which service is protected from interference by amateur signals at all times?

Amateur Radio Service
Land Mobile Service
Radionavigation Service
Broadcasting Service

The correct answer is: Radionavigation Service

In the context of radio communications, the Radionavigation Service is protected from interference by amateur signals because it serves critical purposes, such as aiding in the navigation of aircraft and maritime vessels. This service operates in designated frequency bands that are crucial for providing accurate location and guidance information, and regulatory frameworks, such as those established by the International Telecommunication Union (ITU), ensure that amateur operations do not interfere with these essential services. Amateur Radio Service, while it operates under specific guidelines, does not have the same level of protection from interference as the Radionavigation Service due to its nature of being a non-professional service where operators share the spectrum. The Land Mobile Service and Broadcasting Service, although important, also do not receive the same protections as radionavigation. Therefore, the consistent protection of the Radionavigation Service from interference by amateur signals is vital for safety and operational reliability in navigation.