Availability
Baluns, UNUNs and Chokes
Momobeam RFC-DU 5kW RF Choke Baluns
Momobeam RFC-DU 5kW RF Choke Baluns provide an excellent balance of currents and ensure a proper transition between balanced resonant antenna systems (with low SWR)—such as dipoles and Yagi antennas—and unbalanced coaxial feedlines. These RF Chokes are highly effective at suppressing common mode current from flowing along the exterior of coaxial feedlines, a condition that can cause several issues, including: - Increased noise levels - Inaccurate SWR meter readings - Interference affecting electronic devices within our shack or near the antenna system
Not Yet Reviewed
$265.99
CG Antennas BL-49 Unun
CG Antennas BL-49 Unun, also referred to as a 49:1 Balun, is an outdoor HF antenna feedpoint transformer. This high ratio device is particularly suitable for building an End Fed Half Wave, or EFHW antenna. Available as part number CGA-11365-49 from DX Engineering, this 49:1 Unun is built with heavy gauge wire and a large toroidal ferrite core which handles up to 600W PEP over the entire range from 1.8 to 30 MHz. The waterproof case is high strength plastic with a special valve to drain off unavoidable condensation while preventing insects from entering and nesting. A stainless steel eye hook at the top of the Unun provides an attachment point for a support rope to handle the weight of the Unun, antenna wire, and coax. Also on top is a stainless steel stud and wing nut for the antenna wire and another is on the bottom, next to a SO-239, for an optional counterpoise wire or ground connection. End-fed half-wave antennas (EFHW) are very popular because they are easy to hang in limited space installations while achieving multi-band functionality with a transceiver built-in tuner or an external wide range tuner. In many cases the use of a BL-49 Unun with a specific monoband wire length can achieve low or reasonable SWR on many harmonically related Amateur bands. The radiation pattern of an EFHW antenna is similar to that of a dipole and the 49:1 Unun adapts to different end-fed wire configurations; the antenna wire may be suspended straight and parallel to the ground, or angled as an inverted-V or inverted-L, or run diagonally as a sloper wire, with the BL-49 Unun feedpoint located anywhere from a few feet above the ground hanging high from a support. Experimentation is encouraged with this very adaptable and forgiving feedpoint method, where the position of the wire in relation to the ground or any metal having the greatest effect on the efficiency and the pattern of the EFHW wire antenna. See antenna texts and web forums for wire lengths known to provide the best results, such as 60-70 ft. for 80-10 meters. CG Antennas BL-49 Unun Specifications: Frequency Range: 1.8 - 30 MHz, antenna tuner required. Transformer Ratio: 49:1 Feedline Impedance (Ω): 50 Ohm Max. Power: 600W SSB Connector: SO-239 – UHF female Size (WHD): 3.582 x 5.984 x 2.165 in. (91 x 152 x 55 mm) Weight : 1.15 lbs. (520 g)
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$372.99
Momobeam RFC-DU 10kW RF Choke Baluns
Momobeam RFC DU 10kW RF Choke Baluns provide an excellent balance of currents and ensure a proper transition between balanced resonant antenna systems (with low SWR)—such as dipoles and Yagi antennas—and unbalanced coaxial feedlines. These RF Current Chokes are highly effective at suppressing common mode current from flowing along the exterior of coaxial feedlines, a condition that can cause several issues, including:
Not Yet Reviewed
$361.99
Momobeam RFC-PC 6kW RF Choke Baluns
Momobeam RFC-PC 6kW RF Choke Baluns are efficient broadband common mode current chokes designed to ensure proper current balance and clean transitions between balanced resonant antennas—such as dipoles and Yagi antennas—and unbalanced coaxial feed lines. By delivering excellent suppression of unwanted common mode current across a wide frequency range, these RF chokes help maintain optimal antenna performance and protect sensitive station equipment. Common mode currents can cause a variety of station problems, including elevated receiver noise levels, inaccurate SWR measurements, and interference affecting nearby electronic devices or equipment within the shack. The RFC-PC 6kW effectively prevents these issues by stopping common mode current from traveling on the outside of the coaxial shield, ensuring cleaner transmit and receive performance under all operating conditions. Thanks to its broadband characteristics, the RFC-PC 6kW can be used with virtually any 50 ohm feed antenna system. It is ideal for Yagi antennas, resonant dipoles, and any installation where clean feedline behavior is essential. The choke also serves as an excellent replacement for damaged or aging 1:1 RF chokes or baluns, offering improved suppression and modern build quality. With robust performance, wide compatibility, and reliable common mode current elimination, the Momobeam RFC-PC 6kW RF Choke Baluns provides a simple yet essential upgrade for ensuring your antenna system operates at its best.
Not Yet Reviewed
$434.99