Common Mode Current (CMC) carried on the outside of a coaxial cable braid from your antenna can cause unwanted RF in your radio shack and can radiate this unwanted RF into you and your neighbor’s electronic devices. These currents can burn your fingers on the key or lips on your microphone and they can cause computers and other devices to fault or stop working when you transmit. They can also cause TVI, BCI, and a knock on the door from angry neighbors!
To reduce CMC on the coax you can use a Common Mode Choke. These chokes come in many varieties for various frequency ranges, mechanical attachment methods, choking impedance and cable size. Palomar Engineers offers three choices including Sleeve Chokes, Super Choker™ and CUBE Chokes™ in a range of choking impedances and topologies or shapes for small and large cable sizes.
Need help in choosing a common mode choke? Read: Choosing a Feed Line Choke
Click on the links or pictures for more info on specific feed line chokes.
Sometimes you need a common mode choke that is simple to install and super effective and the Super Choker™ is our solution for installations requiring high power, high SWR, high choking, and low saturation loss. Three models optimized for maximum common mode choking on the 160-40 meter bands, 40-10 meters or 80-10 meters. Click here to learn about this great choke.
|Unun Style 1||Balun Style 1||Balun Style 2|
TUBE feed line chokes are convenient for insertion in the coax feed line at the antenna feed point or the station entrance and they include a ground lug for attachment to a ground rod. Very usewful as coax line isolators along a long coax feed line to break up resonances every 1/2 wavelength. For 1-61 MHz use. Click on picture below or HERE for more info.
Got a question about using feed line chokes? Check out our Application Notes page for more info on RFI and using common mode chokes.
Still need Help? Drop us an email at Sales@Palomar-Engineers.com and we will be glad to answer your question.