EM-25 HF Current Balun
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This 1:1 current balun uses an EM-25 ferrite core ring to suppress common mode noise and improve antenna performance across the 1.8 to 30 MHz HF band. It connects via standard M-type male-to-female PL-259/SO-239 connectors, making installation straightforward in existing coax feedlines. Overall it offers a practical and affordable solution for reducing RF interference and improving signal quality in ham radio and shortwave setups.
Key Features & Specs
| Frequency Range | 1.8 to 30 MHz covering the full HF shortwave spectrum |
|---|---|
| Balun Ratio | 1:1 current balun design for balanced antenna feeding and common mode choke action |
| Ferrite Core | EM-25 ferrite ring core optimized for HF frequency suppression and low insertion loss |
| Connectors | M-type male to M-type female (PL-259/SO-239) for direct in-line coax installation |
| Primary Use | Reduces EMI and common mode currents on coax shield to improve antenna pattern and receiver noise floor |
| Compatibility | Suitable for ham radio transceivers, shortwave receivers, and HF wire or dipole antennas |
| Build | Compact ring choke form factor designed for outdoor or shack feedline use |
Best for: HF ham radio operators and shortwave enthusiasts looking for an affordable, plug-and-play choke balun to reduce common mode noise and improve antenna efficiency on bands from 160 to 10 meters.