Schwarzbeck FSH3D Isotropic 3-Axial RX Loop Antenna

The Schwarzbeck FSH3D consists of three identical, shielded loop antennas, which are aligned perpendicularly to each other. A shielded unit follows, containing the switching and amplifier circuitry, which is directly connected to the N-male output and fed by the Binder-connector with power supply and logic signals to select the desired loop-axis. The pin assignment is ready for operation with the popular handheld spectrum analyzers FSH3/6 and FSH 4/8 from Rohde & Schwarz.

A RF-transparent radome cover protects the FSH3D from dust and moisture. Because of its lightweight construction the FSH3D can be directly mounted to the spectrum analyzer. Alternatively the FSH3D can be held manually at its 50 mm shaft (sweeping method) or attached to a mast or tripod using the 22 mm tube (rotation method or raster method).

Electric Antenna Factor	Magnetic Antenna Factor
Frequency [MHz]	Frequency [MHz]
Maximum Fieldstrength Measuring Range	Noise floor (RMS, BW: 200 Hz)
Frequency [MHz]	Frequency [MHz]
VSWR at N-Connector
Frequency [MHz]

Control:

The active loop can be selected using the spectrum analyzer. Only one of three loops can be active at a time. The logic signals are labeled with TTL1 and TTL2, a logical 1 is represented by a voltage of 3.2 - 5 V. The alignment of the loop planes can be seen in the picture below. The loop of axis 2 lies in the cleavage plane of the radome. The loop planes 1 and 3 are standing vertically and perpendicular to each other, as depicted in the picture. The maximum field strength indication of a respective loop is achieved with the magnetic field lines going perpendicularly through the loop plane.