The HFRA 5146 from Schwarzbeck Mess &ndash Elektronik is a Circular Loop Antenna that operates from DC to 15 MHz. This passive antenna has 2 turns with a loop diameter of 300 mm and has a magnetic field strength of 6.67 A/m (at 1 A coil current). It is shielded against electrical fields and is suitable for calibrating magnetic sensors and research and development applications. The antenna can handle a continuous input power of 10 W and a peak input power of 20 W. It measures 410 x 315 x 50 and has 4 mm (DC to 200 kHz) and N-type jack (15 MHz) terminals. The 4 mm laboratory jacks are connected to the coil directly to allow high currents to be drawn within the frequency range from DC to 200 kHz.