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
FSB31-3/4, ID=3/4", RFI Range 1-300 MHz, Bulk Pack of 5Product DetailsInitial Permeability (@ 10KHz): 1500Material: MnZnMax cable size - in/mm: .728/18.5OD (A) - in/mm: 1.15/29.2ID (B) - in/mm: .74/18.8Length (C) - in/mm: 1.65/41.9Z (ohms per bead - single turn 1 MHz): 16Z (ohms per bead - single turn 5 MHz): 48Z (ohms per bead - single turn 10 MHz): 89Z (ohms per bead - single turn 25 MHz): 125Z (ohms per bead - single turn 100 MHz): 220Z ohms (per bead - single turn 250 MHz): 310Ferrite Snap On, ID = .74 in/18.8 mm, Mix 31, Bulk pack of 5
FSB31-3/4, ID=3/4", RFI Range 1-300 MHz, Bulk Pack of 5
Product Details
Initial Permeability (@ 10KHz): 1500
Material: MnZn
Max cable size - in/mm: .728/18.5
OD (A) - in/mm: 1.15/29.2
ID (B) - in/mm: .74/18.8
Length (C) - in/mm: 1.65/41.9
Z (ohms per bead - single turn 1 MHz): 16
Z (ohms per bead - single turn 5 MHz): 48
Z (ohms per bead - single turn 10 MHz): 89
Z (ohms per bead - single turn 25 MHz): 125
Z (ohms per bead - single turn 100 MHz): 220
Z ohms (per bead - single turn 250 MHz): 310
Ferrite Snap On, ID = .74 in/18.8 mm, Mix 31, Bulk pack of 5