Impedance transformers and feedline chokes can be configured with either balanced output(balun) or unbalanced output( unun). ![]() Feed line chokes are configured in CUBE™ ( Common Unun Balun Enclosure) box enclosures or in “sleeves” with clip on beads or snap on beads, multiple ring toroids ( Super Chokers™), or encased in TUBES. Feed line chokes and impedance transformers can be configured as unbalanced or balanced output each having identical ferrite transformers. Impedance transformers in the Palomar Engineers’ product line have input/output ratios either less than 1:1 (like 50 ohm input to 25 ohm output) or greater than 1:1 (like 50 ohm input to 200 ohm output). ![]() We often get the question – Do I need a balun or an unun? The proper question is – do I need a feed line choke or an impedance transformer whose output is configured as balanced (balun) or as unbalanced (unun)?Ī feed line choke is a 1:1 impedance transformer with equal input and output impedance (usually 50 or 75 ohms in/out). The 1:1.56 unun has 4 quintufilar turns on a l.S-inch OD fenite toroid with a permeability of 250.
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