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.
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Slip On Coax Feed Line Choke - 1"/25.4mm cable, 1.8-300 MHz
Slip On Coax Feed Line Choke - 1"/25.4mm cable, 1.8-300 MHz
SKU BA-200-5
List price
$149.95
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$109.95
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Slip On Feed Line Choke/Isolator - 1/4"/6mm coax cable, RG-58/LMR240, 1-100 MHz
Slip On Feed Line Choke/Isolator - 1/4"/6mm coax cable, RG-58/LMR240, 1-100 MHz
SKU SLO31-1/4-5
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$24.95
Save 28%
$17.95
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Slip On Feed Line Choke/Isolator - 1/4"/6mm coax cable, RG-58/LMR240, 1.8-300 MHz
Slip On Feed Line Choke/Isolator - 1/4"/6mm coax cable, RG-58/LMR240, 1.8-300 MHz
SKU BA-58-5
List price
$24.95
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$16.95
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Slip On Feed Line Common Mode Line Isolator - 1/2"/12.7mm coax cable, 1.8-300 MHz
Slip On Feed Line Common Mode Line Isolator - 1/2"/12.7mm coax cable, 1.8-300 MHz
SKU BA-8-5
List price
$49.95
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$19.95
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Slip On Feed Line Common Mode Line Isolator/Choke - 3/4"/19.5mm coax cable, 1.8-100 MHz, 5,10,15,20 bead option, Mix 31, LMR600
Slip On Feed Line Common Mode Line Isolator/Choke - 3/4"/19.5mm coax cable, 1.8-100 MHz, 5,10,15,20 bead option, Mix 31, LMR600
SKU SLO31-3/4-5
List price
$99.95
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$69.95
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.