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
FB56-61 - 1/4" ID, RFI Range 200-1000 MHzProduct DetailsInitial Permeability (@ 10KHz): 125Material: NiZnMax cable size - in/mm: .25/6.3OD (A) - in/mm: .562/14.3ID (B) - in/mm: .25/6.4Length (C) - in/mm: 1.125/28.6Z (ohms per bead - single turn 100 MHz): 205Z ohms (per bead - single turn 250 MHz): 295Z (ohms per bead - single turn 500 MHz): 370Z (ohms per bead - single turn 1000 MHz): 350Ferrite Slip On Bead - ID = .25 in/6.4mm - Mix 61, 1 piece
FB56-61 - 1/4" ID, RFI Range 200-1000 MHz
Product Details
Initial Permeability (@ 10KHz): 125
Material: NiZn
Max cable size - in/mm: .25/6.3
OD (A) - in/mm: .562/14.3
ID (B) - in/mm: .25/6.4
Length (C) - in/mm: 1.125/28.6
Z (ohms per bead - single turn 100 MHz): 205
Z ohms (per bead - single turn 250 MHz): 295
Z (ohms per bead - single turn 500 MHz): 370
Z (ohms per bead - single turn 1000 MHz): 350
Ferrite Slip On Bead - ID = .25 in/6.4mm - Mix 61, 1 piece