Industrial-grade anti-interference performance Designed specifically for 1.8-30MHz high-frequency radios Strongly suppresses common-mode currents, eliminating equipment electromagnetic interference (EMI) Ensures pure signals for field operations and competitions Heat dissipation: EM43 large magnetic ring (Ø45mm): Increases heat dissipation by 40%, supports 150W PEP high power Plug-and-play, adaptable to all scenarios Medium male (PL-259) to medium female (SO-239) connector Directly connects the radio and feeder in series for quick installation in 3 seconds Suitable for: Shortwave communication/antenna grounding optimization/RF testing/emergency communications/Amateur radio competitions Frequency range: 1.8MHz-30MHz (full HF band coverage) Magnetic ring size: EM43: 45mm diameter Connector type: Medium male (PL-259) to medium female (SO-239) Core Function: 1:1 current-mode balun, common-mode current suppression Power Capacity: EM43: 150W PEP Color:Black Material:Plastic+Metal Package Contents: 1 * Shortwave Choke Magnetic Rings