What is the most common impedance of coaxial cables used in amateur radio?

What is the most common impedance of coaxial cables used in amateur radio?

• A. 75 ohms
• B. 25 ohms
• C. 50 ohms
• D. 100 ohms

Answer: (C)

Coaxial cables are widely utilized in amateur radio for their efficiency in transmitting radio frequency signals. The most common impedance used in amateur radio applications is 50 ohms. This specification is ideal for matching the impedance of typical antennas and radio transmitters. Using 50-ohm coax helps to minimize signal loss and maintain a good transfer of power between the transmitter, coax cable, and antenna. It strikes a balance between power handling capability and attenuation, making it suitable for various amateur radio frequencies and setups. While 75-ohm coaxial cable is commonly used in applications such as television and video distribution due to its lower attenuation characteristics at higher frequencies, it is not standard in amateur radio. The other options, including 25 ohms and 100 ohms, are less common and have specific uses in different applications but do not represent the typical choice for ham radio operations. Therefore, the 50-ohm impedance is recognized as the standard for amateur radio coaxial cable.

Coaxial cables are widely utilized in amateur radio for their efficiency in transmitting radio frequency signals. The most common impedance used in amateur radio applications is 50 ohms. This specification is ideal for matching the impedance of typical antennas and radio transmitters.

Using 50-ohm coax helps to minimize signal loss and maintain a good transfer of power between the transmitter, coax cable, and antenna. It strikes a balance between power handling capability and attenuation, making it suitable for various amateur radio frequencies and setups.

While 75-ohm coaxial cable is commonly used in applications such as television and video distribution due to its lower attenuation characteristics at higher frequencies, it is not standard in amateur radio. The other options, including 25 ohms and 100 ohms, are less common and have specific uses in different applications but do not represent the typical choice for ham radio operations. Therefore, the 50-ohm impedance is recognized as the standard for amateur radio coaxial cable.