ARRL Technician Practice Exam

Why is coaxial cable preferred over other feed lines for amateur radio antenna systems?

1. It is cheaper to manufacture

2. It is easy to use and requires few special installation considerations

3. It offers higher impedance

4. It is lighter and more flexible

The correct answer is: It is easy to use and requires few special installation considerations

Coaxial cable is preferred for amateur radio antenna systems primarily because it is easy to use and requires few special installation considerations. One of the key advantages of coaxial cable is its design, which provides excellent shielding against electromagnetic interference and allows it to carry signals effectively without significant loss, even over longer distances. Coaxial cable's structure consists of a central conductor, an insulating layer, a metallic shield, and an outer jacket, making it relatively straightforward to terminate and connect to various equipment. This simplicity in installation and use is beneficial for amateur radio operators, who may not have advanced technical training in wiring and antenna systems. The ability to run coaxial cable through various environments without extensive preparation or specialized fittings further enhances its practicality, allowing operators to set up their systems quickly and efficiently. While other factors such as cost, weight, and flexibility can influence the choice of feed line, the ease of use and minimal installation requirements make coaxial cable a popular choice among amateur radio enthusiasts.