ARRL Technician Practice Exam

What is the electrical difference between RG-58 and RG-8 coaxial cables?

1. RG-58 has less flexibility

2. RG-8 cable has less loss at a given frequency

3. RG-58 is more commonly used

4. RG-8 cannot handle high frequencies

The correct answer is: RG-8 cable has less loss at a given frequency

The electrical difference between RG-58 and RG-8 coaxial cables primarily centers around their loss characteristics at given frequencies. RG-8 has a larger diameter and a more substantial center conductor than RG-58, which allows it to carry signals more efficiently. This translates to less signal loss over distance, particularly important in applications where long cable runs are required or when transmitting at higher frequencies. In RF applications, lower loss coaxial cables are essential as they ensure that more of the transmitted signal reaches the destination, improving communication quality and effectiveness. Thus, RG-8 being designed for lower attenuation makes it better suited for situations requiring high power or longer cable lengths, significantly impacting performance. The other options do not accurately reflect the primary electrical differences between these types of coaxial cables. For instance, RG-58 is generally considered to be more flexible due to its smaller size, making it easier to handle in tight spaces. While RG-58 is indeed commonly used, it is not the reason behind the electrical performance differences being highlighted in the question. Additionally, RG-8 is capable of handling high frequencies effectively, further reinforcing that it does not have a limitation in that regard.