Momobeam RFC-DBC Dual Big Core 4kW 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‑DBC 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‑DBC 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-DBC Dual Big Core 4kW RF Choke Baluns provide a simple yet essential upgrade for ensuring your antenna system operates at its best.

Additional Features and Specifications:

• RF Choke Type: 1:1 Current Balun

• Frequency Range: 3-50MHz

• Power Rating: 4kW PEP* / 1000W Digital Modes

• Materials: High quality 5mm coaxial cable with PTFE insulation on a 2.9-inch Dual core

• Ratio: 1:1, 50-Ohm

• Termination Type:

(1) SO-239 with PTFE

(2) Stainless steel studs and wing nuts on the opposite side

• Common Mode Rejection: Up to 30-50dB

• Insertion Loss: <0.1dB

• Enclosure Type: UV-resistant ABS box with IP65 protection rating

• Dimensions: 4.72 x 4.72in. (12X12cm)

• Weight: 1.23 lbs.(0.560kg)

Important: *Digital modes such as FT8 and similar, whose duty cycle is very stressful, we recommend using a power not exceeding 25% of the applicable power of the RF Choke!

A higher applied power could cause irreversible damage!