Ham Radio: RFI Filters

Amidon supplies baluns, ununs, ferrite beads, toroids, cable clamp-on split beads, iron powder toroids, toroid experimenter kits, ...

Bencher manufactures the Skyhawk - a 10 element triband HF yagi with a boom length of 24 feet. Bencher also produces the YA-1 low pass filter for RFI reduction.

This article (book?) introduces common-mode chokes, why they are used, how to make common-mode chokes for HF, selecting ferrite components, noise sniffing, a 4:1 current balun, difference mode power line filters, and more.

How to choose ferrites for EMI suppression, ferrites for various applications, ...

MFJ provides several products for audio filtering, power supplies as well as RF filtering and RFI elimination.

Palomar offers RFI Kits, baluns, loop rx antennas and the tuner-tuner.

Palstar offers baluns, filters, and cw keyers for ham radio use.

Par produces intermod filters and antennas for ham radio use.

Vectronics (a MFJ company) produces power supplies and filters for ham use.