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
FSB61-1/2, ID=1/2", RFI Range 200-2000 MHzProduct DetailsInitial Permeability (@ 10KHz): 125Material: NiZnMax cable size - in/mm: .5/12.7OD (A) - in/mm: 1.14/29ID (B) - in/mm: .514/13.1Length (C) - in/mm: 1.14/29Z (ohms per bead - single turn 100 MHz): 205Z ohms (per bead - single turn 250 MHz): 320Z (ohms per bead - single turn 500 MHz): 435Z (ohms per bead - single turn 1000 MHz): 457Ferrite Snap On, ID = .514in/13.1 mm, Mix 61
FSB61-1/2, ID=1/2", RFI Range 200-2000 MHz
Product Details
Initial Permeability (@ 10KHz): 125
Material: NiZn
Max cable size - in/mm: .5/12.7
OD (A) - in/mm: 1.14/29
ID (B) - in/mm: .514/13.1
Length (C) - in/mm: 1.14/29
Z (ohms per bead - single turn 100 MHz): 205
Z ohms (per bead - single turn 250 MHz): 320
Z (ohms per bead - single turn 500 MHz): 435
Z (ohms per bead - single turn 1000 MHz): 457
Ferrite Snap On, ID = .514in/13.1 mm, Mix 61