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
FT140-43, ID=.9", OD=1.4", RFI Range 25-300 MHzProduct DetailsRFI Range (MHz): 20-250 MhzID-B (in/mm): .9/23OD-A (in/mm): 1.4/35.6Height-C (in/mm): .5/12.7Weight (oz/gm): 33 gramsInitial permeability: 850A(L): 1060Frequency (MHz)/Single turn impedance (ohms): 25MHz:38 ohms, 100 MHz:80 ohmsFerrite Ring Toroid Core, ID = .9"/23mm, Mix 43
Excellent for impedance transformers like 2:1, 4;1, 9:1 or use our convenient Balun/Unun DIY kits with all the parts needed.
Ferrite Ring Toroid Core, ID = .9"/23mm, Mix 43
Excellent for impedance transformers like 2:1, 4;1, 9:1 or use our convenient Balun/Unun DIY kits with all the parts needed.
