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
FB68-31 - 3/8" ID, RFI Range 1-300 MHzProduct DetailsInitial Permeability (@ 10KHz): 1500Material: MnZnMax cable size - in/mm: .25/6.3OD (A) - in/mm: .687/17.45ID (B) - in/mm: .375/9.5Length (C) - in/mm: 1.125/28.6Z (ohms per bead - single turn 1 MHz): 27Z (ohms per bead - single turn 5 MHz): 69Z (ohms per bead - single turn 10 MHz): 89Z (ohms per bead - single turn 25 MHz): 138Z (ohms per bead - single turn 100 MHz): 225Z ohms (per bead - single turn 250 MHz): 265Ferrite Slip On Bead, ID = .375in/9.5mm, Mix 31
FB68-31 - 3/8" ID, RFI Range 1-300 MHz
Product Details
Initial Permeability (@ 10KHz): 1500
Material: MnZn
Max cable size - in/mm: .25/6.3
OD (A) - in/mm: .687/17.45
ID (B) - in/mm: .375/9.5
Length (C) - in/mm: 1.125/28.6
Z (ohms per bead - single turn 1 MHz): 27
Z (ohms per bead - single turn 5 MHz): 69
Z (ohms per bead - single turn 10 MHz): 89
Z (ohms per bead - single turn 25 MHz): 138
Z (ohms per bead - single turn 100 MHz): 225
Z ohms (per bead - single turn 250 MHz): 265
Ferrite Slip On Bead, ID = .375in/9.5mm, Mix 31