REZ Antenna Systems CM7 Common Mode Feedline Chokes are inline 1:1 common mode feedline chokes, consisting of seven mix-31 ferrite beads on flexible RG223/U double shielded coax with one UHF female connector and one UHF male connector. Proudly made in the USA, the compact and streamlined CM7 was designed to solve some of the most common issues that can negatively impact antenna system tuning and performance.

For instance, common mode current carried on the outside of a coaxial cable can cause unwanted RF traveling back to your operating position, causing many issues. Another common issue is that the coax will become part of the antenna system and begin radiating RF. In most cases this is undesirable.

Simply install the CM7 at the feed point of your antenna and attach your exiting coaxial cable to the opposite end. The CM7 can be used with many popular antenna types, such as EFHW, dipoles, random wires and verticals, to improve tuning consistency and antenna performance. Many antennas require the use of a 1:1 choke to isolate the coaxial cable from the antenna system for proper performance. Why not improve the performance of your antenna system? Order a REZ Antenna Systems CM7 Common Mode Choke from DX Engineering.

Common Mode Choking Properties

• Frequency Range: 1.0 to 300 MHz

• Power Rating: 300W

Additional Features and Specifications:

• Length: 18.25 in.

• Max. Diameter: 0.71 in.

• Color: Black/Silver

• Connectors: SO-239 Female/PL-259 Male

• Weight: 7.6 oz. (+- .5 oz.)

• Coaxial cable: 50 Ohm, RG223/U double shielded