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
FSB75-3/8, ID=3/8", RFI Range 150Khz-10 MHz, 10 PackProduct DetailsInitial Permeability (@ 10KHz): 5000Material: MnZnMax cable size - in/mm: .388/9.85OD (A) - in/mm: .906/23ID (B) - in/mm: .4/10.15Length (C) - in/mm: 1.55/39.4Z (ohms per bead - single turn 200 KHz): 18Z (ohms per bead - single turn 500 KHz): 46Z (ohms per bead - single turn 1 MHz): 92Z (ohms per bead - single turn 2 MHz): 115Z (ohms per bead - single turn 5 MHz): 74Ferrite Snap On, ID = .40 in/10.15mm, Mix 75, 10 pack - very useful for low frequency 150 KHz - 10 MHz. Better than Mix 31 below 4 MHz.
FSB75-3/8, ID=3/8", RFI Range 150Khz-10 MHz, 10 Pack
Product Details
Initial Permeability (@ 10KHz): 5000
Material: MnZn
Max cable size - in/mm: .388/9.85
OD (A) - in/mm: .906/23
ID (B) - in/mm: .4/10.15
Length (C) - in/mm: 1.55/39.4
Z (ohms per bead - single turn 200 KHz): 18
Z (ohms per bead - single turn 500 KHz): 46
Z (ohms per bead - single turn 1 MHz): 92
Z (ohms per bead - single turn 2 MHz): 115
Z (ohms per bead - single turn 5 MHz): 74
Ferrite Snap On, ID = .40 in/10.15mm, Mix 75, 10 pack - very useful for low frequency 150 KHz - 10 MHz. Better than Mix 31 below 4 MHz.