RBR1000W 3-in-1 Shortwave Common Mode Filter, 1.8-54MHz Waterproof RFI Reduction Choke & RF Ground, Band-Pass Filter, 0.3dB Insertion Loss, SWR<1.2 for Amateur Radio Outdoor/Indoor Use

Specification: GOOZEEZOO 3-in-1 Shortwave Common Mode Filter The GOOZEEZOO 3-in-1 Shortwave Common Mode Filter is a multi-functional RF accessory specially designed for amateur radio bands. It integrates three core functions: common mode filtering, grounded terminal, and band-pass filtering, primarily used to suppress unwanted RF noise, static electricity, and common mode currents on the outer braid of coaxial cables. Common mode currents not only severely disrupt the normal operation of amateur radio equipment but may even cause equipment damage. This choke ring effectively blocks common mode currents from entering the device while fully ensuring the transmission integrity of effective signals on the inner conductor. It is an essential and indispensable component in shortwave antenna systems for improving transmission efficiency, ensuring transmission quality, eliminating static electricity, resolving interference issues, and enabling safe operation. Covering the full shortwave band of 1.8–54 MHz with a standard 50Ω impedance, this filter features a low insertion loss of 0.3 dB at 28 MHz, an SWR <1.2, and common mode attenuation up to 50 dB. The built-in band-pass filter precisely filters out all interference signals outside the 1.8–54 MHz range, reducing radio noise at the source, significantly improving receiving clarity, lowering the noise floor, and minimizing RF feedback, distortion, and inter-equipment interference. The series includes three core models: 2000W, 1000W, and 300W, sharing identical basic RF parameters while differing in power rating, structure, and functional compatibility to precisely match various amateur radio devices and usage scenarios. The 2000W and 1000W models are equipped with waterproof and sun-proof housings, with waterproof connectors, enabling long-term outdoor installation even in harsh environments. The 300W model is a compact common mode filter with only the magnetic ring core, lightweight and simple, ideal for miniaturized and indoor applications. As a high-performance common mode choke balun, its core role is to concentrate RF energy on the antenna and prevent it from leaking back into the feedline or radio room. Its five key functions are summarized as follows: Static Elimination: Effectively dissipates static charges from the antenna, solving strong static issues in dry conditions (e.g., winter) and ensuring equipment and operational safety. Isolation & Decoupling: Provides high electrical isolation between the antenna and feedline, preventing the feedline outer shield from acting as part of the antenna and avoiding interference caused by feedline radiation. Enhanced Radiation Efficiency: By suppressing common mode currents, it forces RF current to follow the designed path directly to the antenna elements, greatly improving the RF radiation efficiency of the antenna. RFI Suppression: Blocks reverse RF signal leakage into the radio room, preventing indoor RF interference and ensuring equipment compatibility and operational safety. Improved Radiation Pattern: Maintains the designed standard radiation pattern for directional shortwave antennas, preserving their directional communication performance.

• 3-in-1 Advanced Protection: This multi-function device integrates common mode filtering, a grounding terminal, and a band-pass filter into a single unit. It accurately blocks common mode currents to prevent equipment interference while filtering out-of-band clutter
• 1000W Multi-Scenario Power: With a robust 1000W PEP rating, this filter is compatible with both fixed indoor radio stations and medium-power outdoor setups. It meets the daily communication and field antenna needs of amateur radio enthusiasts
• Rugged Waterproof Housing: Equipped with an integrated, sunproof housing and professional waterproof connectors, this RF choke filter is built for long-term outdoor installation. It remains resistant to rain and UV exposure, ensuring stable performance in complex environments
• RFI Reduction Choke: Works across the 1.8-54MHz band with 50Ω impedance, delivering outstanding common-mode suppression and low-loss signal transmission to reduce RF interference and system noise
• Total Station Stability: Effectively eliminates antenna static and achieves true electrical isolation between the antenna and feedline. By establishing a solid RF ground, it maximizes radiation efficiency and maintains the integrity of directional antenna patterns