12:1 Baluns/Ununs

982840129 - 12:1 Baluns/Ununs
+3

DC Cable Noise Filter for Large Gauge Wire - 3" ID

DCCF-3
$39.95
In stock
1
Product Details
MPN: DCCF-3
Type: New
Country/Region of Manufacture: United States
RFI Range (MHz): 1-300 MHz
ID-B (in/mm): 3/76.2
OD-A (in/mm): 4/101.6
Height-C (in/mm): 1/25.4
Weight (oz/gm): 420 grams
Initial 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.

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12:1 Baluns are useful between 600-650 ohm balanced loads the impedance at the  end of the feed line is 600 ohms (1/2 wavelength feed line), or high impedance feeds for rhombic,  T2FD and traveling wave antennas.

12:1 Ununs are useful between coax and long wires with a load impedance near 600 ohms like a beverage antenna.  Shortwave listener antennas also can benefit with the 12:1 unun and it may provide a better match than 9:1 ununs – this means quieter noise levels and stronger signals so you can hear distance stations easier.