Which coaxial cables have a characteristic impedance of 75 ohm?

The characteristic impedance of coaxial cables is an essential factor in ensuring proper signal transmission and minimizing reflections. Series-6 and Series-59 cables both have a characteristic impedance of 75 ohms, which is the standard impedance for most video and broadband applications.

Series-6 coaxial cable is commonly used for cable television (CATV) and is designed to carry video signals efficiently, utilizing its 75-ohm impedance for optimal performance. Similarly, Series-59 is also widely used in applications such as CCTV systems and satellite communications, where a 75-ohm connection is crucial to maintain signal integrity.

In contrast, RG-58 is a coaxial cable that has a characteristic impedance of 50 ohms and is typically used in radio frequency applications, including Ethernet networks. This difference in impedance makes RG-58 unsuitable for applications specifically requiring 75-ohm cables, such as those served by Series-6 and Series-59.

By recognizing that both Series-6 and Series-59 cables share a characteristic impedance of 75 ohms, it is clear why the correct answer encompasses both of them. Understanding the impedance of coaxial cables is crucial for professionals in the field to ensure compatibility across connections and to optimize system performance.