1.8-30MHz EM-43 Shortwave Magnetic Rings 1:1 Current-Mode Balun for HF Shortwave Radio Anti-Interfe Industrial-grade anti-interference performance Designed specifically for 1.8-30MHz high-frequency radios Strongly suppresses common-mode currents, eliminating equipment electromagnetic interference () Ensures pure signals for field operations and competitions Heat dissipation: EM43 large magnetic ring (45mm): 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/ 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 Magnetic Rings Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.