HFR-3 H-Field Rod Antenna: High-Sensitivity Magnetic Field Testing

The A.H. Systems HFR-3 is a precision H-Field Rod Antenna engineered for applications requiring high sensitivity in magnetic field measurements. Operating across a frequency range of 1 MHz to 10 MHz, this antenna is an essential component for MIL-STD, VDE, and TEMPEST compliance testing.

Designed with a specialized ferrite rod core, the HFR-3 "concentrates" the magnetic component of RF signals, allowing it to achieve a significantly higher level of sensitivity than traditional loop antennas of comparable size. This design provides a compact and lightweight solution ideal for portable field applications. The antenna is shielded against electric fields and is highly directional, featuring deep nulls to assist in precise signal location.

For the HFR-3 H-Field Rod Antenna to function correctly and provide accurate measurement data, it must be operated with the EHA-50B Matching Preamplifier. This antenna element is designed as part of an active system where the preamplifier provides the essential impedance matching and signal amplification across the 1 MHz to 10 MHz frequency spectrum. Utilizing the EHA-50B ensures that the magnetic field components are properly converted into a calibrated voltage output, maintaining the high sensitivity and reliability required for rigorous compliance testing. Operating the HFR-3 without this specific preamplifier will result in improper loading and invalid calibration results.