5:1 CUBE™ Unun – Model CU-5-1500 (50:250 Ohm, 1.8-61 MHz, 1.5KW PEP)
Application. For traveling wave, end fed or portable 20-31 foot vertical antennas the 5:1 unun makes a good transformer for converting 50 ohm coax to a 250 ohm feed point. If you use the antenna on multiple bands, the feed point impedance may not always be 250 ohms and use of the unun at high (>350 ohms) or low (<100 ohms) will require reduced power input or the unun may have its power ratings exceeded and damage to the unun may occur. The (5:1 conversion ratio will change for loads other than 250 ohms unbalanced.
Typical application:
Also available as a balanced output – CB-5-1500
Slip On Sleeve Chokes
Palomar 1:1 feed line choke kits are current baluns (split output) or ununs (coax output). They consist of several models with 5-15 large ferrite beads that slip over the coax (but will not slip over a connector). Also included are three lengths of shrink tubing to enclose the balun and hold the beads in place on the cable. They work from 1.8-300 MHz (see impedance table for each product for measured choking impedance levels for 5-15 beads) and allow use of full power rating of the coaxial cable at an SWR of 1:1. No tools are required for installation, just a source of heat to shrink the tubing using a heat gun, lighter, matches.
Refine by On Sale
Slip On Coax Feed Line Choke - 1"/25.4mm cable, 1.8-300 MHzSlip On Coax Feed Line Choke - 1"/25.4mm cable, 1.8-300 MHzSKU BA-200-5List price $149.95 Save 27%$109.95On Sale
Slip On Feed Line Choke/Isolator - 1/4"/6mm coax cable, RG-58/LMR240, 1-100 MHzSlip On Feed Line Choke/Isolator - 1/4"/6mm coax cable, RG-58/LMR240, 1-100 MHzSKU SLO31-1/4-5List price $24.95 Save 28%$17.95On SaleSlip On Feed Line Choke/Isolator - 1/4"/6mm coax cable, RG-58/LMR240, 1.8-300 MHzSlip On Feed Line Choke/Isolator - 1/4"/6mm coax cable, RG-58/LMR240, 1.8-300 MHzSKU BA-58-5List price $24.95 Save 32%$16.95
Slip On Sleeve Chokes
Palomar 1:1 feed line choke kits are current baluns (split output) or ununs (coax output). They consist of several models with 5-15 large ferrite beads that slip over the coax (but will not slip over a connector). Also included are three lengths of shrink tubing to enclose the balun and hold the beads in place on the cable. They work from 1.8-300 MHz (see impedance table for each product for measured choking impedance levels for 5-15 beads) and allow use of full power rating of the coaxial cable at an SWR of 1:1. No tools are required for installation, just a source of heat to shrink the tubing using a heat gun, lighter, matches.
