The EHA-50B Preamplifier is a low input impedance preamplifier made to match to the H-Field Rod antenna series. This preamplifier operates efficiently over the frequency range of 100 Hz to 30 MHz. It is suitable for MIL-STD, VDE, and TEMPEST testing, with reliable, repeatable measurements.

An H-field rod antenna element is composed of a ferrite rod with a coil around the ferrite and a matching unit (EHA-50B). The benefit of this type of antenna is its compact size and convenience for portable applications. The ferrite material "concentrates" the magnetic component of the RF signal into the coil allowing the physically small antenna to have a larger effective area. In other words, the ferrite rod antenna has a much greater level of sensitivity than if the coil had been used on its own.

Included parts:
• EHA-50B Antenna Matching Preamplifier
• Battery Charger
• Calibration Manual

* Calibration data and certificate included