PL-259 SO-239 Balun EM-25 Shortwave Choke Magnetic Ring For 1.8-30MHz HF Shortwave Radio PL259 SO239 Choke For Antenna COMMON MODE CURRENT SUPPRESSION: Efficiently eliminates electromagnetic interference EMI, ensuring clean comm signals during outdoor operations and competitions. FERRITE RING: Constructed with high permeability ferrite magnetic rings, the EM25 boasts anti high temperature and antisaturation, ensuring no magnetic degradation even under high power usage. INDUSTRIAL GRADE ANTI INTERFERENCE: This device is designed for 1.8-30MHz high frequency radio stations, eliminating noise wave for pure signal. · COMMON MODE... PLUG AND PLAY: Featuring an M male (PL 259) to M female (SO 239) connector, this magnetic ring allows for quick and efficient installation, easily connecting your radio and feedlines in just 3 seconds. LIGHTWEIGHT AND PORTABLE: Compact with a diameter of 25mm and fast heat dissipation, the EM25 shortwave choke magnetic ring supports up to 100W PEP. DIY Ferrite Chokes - DIY Ferrite Chokes - Palomar Engineers INDUSTRIAL GRADE ANTI INTERFERENCE: This device is designed for 1., 8-30MHz high frequency radio stations, eliminating noise wave for pure signal. Frequency Range: 1.8MHz to 30MHz (covers full HF band). Application: for 1.8 to 30MHz high frequency radios. Item Type: EM-25 Shortwave Choke Magnetic Ring. PLUG AND PLAY: Featuring an M male (PL 259) to M female (SO 239) connector, this magnetic ring allows for quick and efficient installation, easily connecting your radio and feedlines in just 3 seconds