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
DC Cable Noise Filter for Large Gauge Wire - 3" IDProduct DetailsMPN: DCCF-3Type: NewCountry/Region of Manufacture: United StatesRFI Range (MHz): 1-300 MHzID-B (in/mm): 3/76.2OD-A (in/mm): 4/101.6Height-C (in/mm): 1/25.4Weight (oz/gm): 420 gramsInitial permeability: 1500(4″ OD, 3″ ID hole), RFI Noise Suppression Range: 1-300 MHz
Excellent for large cables or multiple cables – use multiple cores for higher choking. Also useful when you need high turns count for high choking with large cable - works on large gauge DC power cables.
Note: put both positive and negative cables TOGETHER through the filter so that their differential currents cancel but their common mode currents are suppressed.
(4″ OD, 3″ ID hole), RFI Noise Suppression Range: 1-300 MHz
Excellent for large cables or multiple cables – use multiple cores for higher choking. Also useful when you need high turns count for high choking with large cable - works on large gauge DC power cables.
Note: put both positive and negative cables TOGETHER through the filter so that their differential currents cancel but their common mode currents are suppressed.