HFR-2 H-Field Rod Antenna: High-Sensitivity Magnetic Field Testing

The A.H. Systems HFR-2 is a high-performance H-Field Rod Antenna designed for applications requiring extreme sensitivity in magnetic field measurements. Operating efficiently over a frequency range of 20 KHz to 2 MHz, this antenna is an essential tool for MIL-STD, VDE, and TEMPEST compliance testing.

Utilizing a specialized ferrite rod core, the HFR-2 "concentrates" the magnetic component of RF signals, allowing it to achieve a much higher level of sensitivity than traditional loop antennas of a similar size. This design makes it a compact and convenient solution for portable field applications. The antenna is shielded from electric fields and is highly directional, providing deep nulls for precise signal location.

For proper operation and accurate measurement results, the HFR-2 H-Field Rod Antenna requires the use of the EHA-50B Matching Preamplifier. As a passive sensing element, the HFR-2 is specifically designed to work with the preamplifier's active circuitry to achieve the necessary impedance matching and signal gain across its 20 KHz to 2 MHz frequency range. This integrated setup is essential for converting magnetic field strength into precise voltage readings, ensuring the high sensitivity and repeatable data necessary for MIL-STD and TEMPEST compliance. Using the antenna element without the dedicated EHA-50B preamplifier will lead to incorrect signal levels and render the provided calibration data invalid.