Quick Answer
For VHF antennas, the best type of coaxial cable is a low-loss, 50-ohm, RG-8X or RG-11 cable, with a minimum of 95% shield coverage to prevent signal loss and interference.
Choosing the Right Coaxial Cable
When selecting a coaxial cable for your VHF antenna, it’s essential to consider the frequency range, cable length, and loss budget. VHF frequencies range from 30 MHz to 300 MHz, and cable loss increases with frequency and cable length. To minimize loss, use a low-loss cable with a high shield coverage percentage. A 95% shield coverage is the minimum recommended for VHF antennas.
Cable Specifications
A 50-ohm coaxial cable is the recommended impedance for VHF antennas. RG-8X and RG-11 cables are popular choices for VHF applications due to their low loss and high shield coverage. RG-8X has a slightly smaller diameter than RG-11, making it easier to work with in tight spaces. However, RG-11 has a higher shield coverage percentage, making it a better choice for longer cable runs or in noisy environments.
Installation Tips
When installing coaxial cable, it’s crucial to keep the cable as short as possible to minimize loss. Use cable ties to secure the cable to a mast or boom, and avoid touching the cable to other metal objects to prevent signal loss and interference. Use a cable clamp to secure the cable to a antenna connector, and ensure the clamp is tightened firmly to prevent signal loss. By choosing the right coaxial cable and following proper installation techniques, you can ensure reliable and efficient VHF antenna performance.
Find more answers
Browse the full Q&A library by topic, or jump back to the topic this question belongs to.