SLIP ON Sleeve Chokes

HF Wire Antennas - End Feds, Off Center Fed, Loop, T2FD/BBTD, Dipoles and Zepps,160-6 Meters,Wire, Hardware and Instructions for you.

Ferrite Products - Rings, Snap On, Slip On, useful from 150KHz - 2 GHZ, Mixs 31, 43, 52, 61, 75

RFI Solutions - Consumer Electronics, Computer, Audio/Home Theater, Wall Warts, Solar and more!

Baluns/Ununs/Chokes (1:1-81:1 ratios) for RX, 100/500/1500/5000 Watts including Hybrids (with choke) and Multi-Ratio

Radio Transceiver/Linear Amplifier RFI Kits - All Brands, VLF, HF to UHF

Noise Filters - Coax, AC and DC power 100 KHz - 150 MHz, up to -48 dB noise suppression - hear DX again!

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1:1 Feed Line Common Mode Chokes


Baluns are used to connect balanced antennas to unbalanced  transmission lines (Coaxial cable) and Ununs are used to connect unbalanced transmission lines to unbalanced transmission lines or unbalanced antennas (e.g. verticals).  In the case of 1:1 baluns the input is usually an unbalanced coax cable and the output load is a two terminal balanced load like an antenna.  Ununs are also called line isolators, feed line chokes, and 1:1 coaxial baluns (incorrectly).  1:1 Baluns and ununs stop common mode currents (flowing on the outside of the coax braid due to skin effect) when they are located at the antenna feedpoint. They can also be used as “line isolators/chokes” anywhere along the cable to suppress flow of induced RF (antenna near field radiation and neighborhood noise pickup) which helps suppress RFI into the radio receiver/transmitter.  For best results, put one at the antenna feed point connection, and one at the radio room entrance, and for difficult common mode current cases, one every 1/4 wavelength along the antenna feed line.  For low (below 3 MHz) frequencies, use two 5 bead baluns in series to double the choking impedance or order the 10 bead or 15 bead version for higher choking power.