About Us
Palomar Engineers provides ferrite products and filters to suppress RFI/EMI interference and radio receiver noise from 100 KHz to 1000 MHz. We also manufacture antennas and related products including common mode coaxial feed line chokes, power combiner splitters, DC interference filters, and broadband impedance transformers used for antenna and transmission line matching.
Our RFI products are used in AM/FM Broadcast stations, amateur and commercial radio stations, consumer households, radar sites, solar power sites, the International Space Station, automotive, marine, medical, military, and numerous industrial and manufacturing operations and university research centers.
SLIP-ON FERRITE BEADS
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.