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Baluns, Ununs and Chokes
Reduce SWR, RFI, and pattern distortion with our leading-brand Baluns, Ununs, and Chokes! For the proper connection and RF transition from a balanced antenna to an unbalanced...
Reduce SWR, RFI, and pattern distortion with our leading-brand Baluns, Ununs, and Chokes! For the proper connection and RF transition from a balanced antenna to an unbalanced coax our baluns provide excellent common mode rejection and current balance so antennas operate at maximum efficiency and high isolation for minimal noise. Ununs are used for matching an unbalanced antenna to an unbalanced feedline. Feedline chokes keep noise out of the antenna and the receiver to improve overall reception plus they reduce RFI by eliminating feedline radiation. Enjoy maximum power transfer, optimum balance and a lot less noise. Shop...
Reduce SWR, RFI, and pattern distortion with our leading-brand Baluns, Ununs, and Chokes! For the proper connection and RF transition from a balanced antenna to an unbalanced coax our baluns provide excellent common mode rejection and current balance so antennas operate at maximum efficiency and high isolation for minimal noise. Ununs are used for matching an unbalanced antenna to an unbalanced feedline. Feedline chokes keep noise out of the antenna and the receiver to improve overall reception plus they reduce RFI by eliminating feedline radiation. Enjoy maximum power transfer, optimum balance and a lot less noise. Shop for DX Engineering Baluns, Ununs and Feedline Chokes here!
DX Engineering TWIG QRP 9:1 UNUNs
The DXE-TWIG-9-1 QRP UNUN (Unbalanced-to-Unbalanced transformer) matches a high-impedance, non-resonant end-fed/random wire antenna (33 to 84 feet long) to the 50-ohm unbalanced load required by amateur radio transceivers. The DXE TWIG-9-1 covers 1.8–30 MHz and is ideal for portable (QRP) or HOA-restricted antennas. The connector on the DXE-TWIG-9-1 is a BNC female to mate with the recommended 35 to 50 feet of coax cable, which is used as the counterpoise. In some cases, an external wide range tuner may be needed. This UNUN may not provide a perfect 1:1 SWR on all bands without an additional tuner and may experience heating at higher power due to impedance mismatches. Typically, 9:1 UNUNs are used for: • Random Wire Antenna: Long wires of specific non-resonant lengths (e.g., 29, 35.5, 41, or 71 feet) designed to avoid an electrical half-wave, or multiple of a half-wave, on any amateur band. • End-Fed Long Wire: General-purpose long wire used for wideband receiving or multiband transmitting where an antenna tuner is available. • Inverted "L" or Sloper Configuration: When these are fed as non-resonant wires rather than resonant half-wave radiators. Tips on How to Use the 9:1 QRP UNUN as a Random Wire Antenna 1. Select a "Random" Length: Do not use resonant half-wave lengths. Popular lengths that avoid resonance on amateur bands include e.g., 29, 35.5, 41, or 71 feet. 2. Connect the Antenna Wire: Attach your long wire to the element wire terminal of the UNUN. 3. Use an Antenna Tuner: Because a random wire is never perfectly resonant, you may have to use an internal or external antenna tuner to achieve a low SWR for your transceiver. 4. Placement: Mount the UNUN near the ground or on a short support and run the element wire as high and clear of obstacles as possible. The antenna shown in this manual was tested using the optional 24 or 26 AWG wire such as CEW-VIZ24-YEL100 stranded copper, PVC insulated, high visibility yellow antenna wire. The coax cable (with BNC connectors) is recommended to be 35 to 50 feet in length since the coaxial cable shield is used as the counterpoise. The antenna can be installed in different configurations. Wire lengths will vary depending on the installation and antenna design chosen. This is a low power (QRP) antenna system impedance matching UNUN which handles 25 Watts on SSB, 10 Watts on CW and 5 Watts on digital mode when the antenna SWR is less than 2:1 without the use of an antenna tuner.
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$49.99