We use
cookies and similar technologies
to help give you the best experience on our site and to show you relevant advertising. If you continue to use this site, we’ll assume that you’re happy to receive all cookies
REZ Antenna Systems CM7 Common Mode Feedline Choke
SKU Part Number:
REZ-CM7
The REZ Antenna Systems CM7 Common Mode Feedline Choke is a compact inline 1:1 choke designed to help reduce common mode current on coaxial...
Read More
Read More
£59.95
Pre Order
Seen this product cheaper elsewhere?
Call 0345 2300 599
The REZ Antenna Systems CM7 Common Mode Feedline Choke is a compact inline 1:1 choke designed to help reduce common mode current on coaxial feedlines. Made in the USA, it uses seven mix-31 ferrite beads over flexible RG223/U double shielded coax, with an SO-239 female connector at one end and a PL-259 male connector at the other.
Common mode current travelling on the outside of coaxial cable can cause unwanted RF to return to the operating position, increase receive noise, affect tuning, and cause the coax itself to become part of the antenna system. Installing a suitable choke at the antenna feed point can help isolate the feedline and improve tuning consistency.
The CM7 is suitable for use with many popular antenna types, including EFHW antennas, dipoles, random wires and verticals. Simply install the choke at the feed point of the antenna, then connect your existing coaxial cable to the opposite end.
With a frequency range of 1.0 to 300MHz and a 300W power rating, the CM7 is a useful addition to portable, fixed and temporary antenna systems where improved feedline isolation is required.
Key Features
- Inline 1:1 common mode feedline choke
- Helps reduce common mode current on coaxial cable
- Suitable for EFHW antennas, dipoles, random wires and verticals
- Can help improve tuning consistency and antenna performance
- Helps reduce unwanted RF travelling back to the operating position
- Seven mix-31 ferrite beads
- Flexible RG223/U double shielded coax
- SO-239 female to PL-259 male connections
- Compact heat shrink construction
- Made in the USA
Specifications
- SKU: REZ-CM7
- Product type: Common mode feedline choke
- Ratio: 1:1
- Frequency range: 1.0 to 300MHz
- Power rating: 300W
- Termination impedance: 50 ohms
- Coaxial cable: RG223/U double shielded, 50 ohm
- Connectors: SO-239 female and PL-259 male
- Core type: Ferrite beads over coax
- Enclosure type: Heat shrink tubing
- Length: 46.4cm (18.25 inches)
- Maximum diameter: 18mm (0.71 inches)
- Colour: Black and silver
- Weight: 215g (7.6oz), plus or minus 14g (0.5oz)
Shipping:
We have several shipping options for our products, including next-day and Saturday/Sunday delivery for certain items. Please see these options at checkout.
Returns:
If you have any equipment that needs to be returned to Martin Lynch & Sons, please fill out the form below:
Upon receipt of goods you have 14 days to return goods however the goods must be returned in original packaging and care must have been taken with the goods you wish to return. Under distance selling regulations you are not entitled to any refund on carriage charges or modification charges made at your request. Large items cannot be returned if they have been assembled, unless faulty.
Warranty Terms and Conditions
Outside of the 14 faulty return period, returned items cannot be accepted, unless covered by manufacturer's warranty. We will repair as much as possible on site however in exceptional circumstances products may have to be returned to the manufacturer of distributor.
For repairs/replacements under manufacturer’s warranty for any item please download a ML&S return form from the link above and return to ML&S with the faulty product.
International Warranty information
Warranty service for items we sell is available in the U.K. only, unless otherwise noted. It is your responsibility to pay freight for returned items to the U.K. and back to you for desired warranty coverage. All of our NEW products come with a minimum 12 month warranty, (Yaesu & Icom 24 months), with up to 90 days on second-hand equipment. Items returned for service must state "returned goods for repair" on the return air waybill or U.K. import customs duties apply and will be added to your invoice. For more info about returning items please contact our customer help desk, [email protected]