- Essentially, a choke balun is designed to 'divorce' your antenna from the feed line. if your feed line is coaxial cable then you don't want it to be part of your antenna. you want to be able to deliver all your power to the radiator itself, i.e. 'the antenna'. a choke balun does this admirably
Another Ugly Choke Balun
- A home made balun build using a short length of 4 inch drain pipe and 18 foot of RG58 by G4APL
- A "choke" is the common name given to an inductor that is used as a power supply filter element. They are typically gapped iron core units, similar in appearance to a small transformer, but with only two leads exiting the housing
Common Mode Choke Theory
- A common mode choke may be used to reduce a type of electrical noise known as common mode noise. Electro-magnetic interference (E.M.I.) in the circuit's environment is one source of electrical noise.
Common mode chokes
- Excellent article on limiting noise using chockes by Chuck Counselman, W1HIS
Eliminating TX RF Feedback Problems
- Malfunction of transceivers due to stray RF pickup is a common problem, especially when using end-fed antennas, high-impedance feedlines, or a poor ground counterpoise
- Connecting centre fed antennas, dipoles, yagis, rhombics, loops to coaxial cable, unless care is taken, it is not difficult to end up with feeder radiation resulting in power loss and the radiation characteristics changes
RF choke or 1:1 balun
- RF Choke to prevent hf currents on the feedline
or...1:1 Choke Balun, sometimes called the "UGLY BALUN"
The Ugly Balun
- A 1:1 choke balun for 160 thru 10 meters using one continuos lenght of coax to rig.