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Transmitting Loop Antenna, type MTA-MLA-930

Spec

	Frameantenna
-	Passivemagneticbroadcastingantenna,broadbandtransferable
-	Frequencyrange9kHz–30MHz
-	Max.inputpower30Wcontinuously,100Wforshortperiods
-	RF-connectors,female2xBNC
-	Camerathread3/8“-thread
-	VSWRtyp.(Ref.50Ω)<1.2of0.1–10MHz

 

In the VLF-HF frequency range 9 kHz to 30 MHz the magnetic field strength is measured preferably, but often expressed in the unit of the electric field strength as the "fictive E field level" (dBμV/m). In the undistorted far-field both units are linked by the characteristic impedance of free space 120 pW = 377 W. Practical EMC/EMI measurements however are carried out in the near-field zone (D <0.1 l). For that reason defined magnetic field sources are required. For immunity tests powerful H fields might be needed, but also general tests and measurements at an open site in screened rooms and in absorber-lined rooms require well-defined powerful H field sources. Magnetic fields in the near-field zone decay with the inverse 3rd power of distance (approx. 18 dB at twice the distance). Even at 1 m distance at 30 MHz the transition from pure near-field to far-field begins, the exponent of degradation gradually reduces from 3 to 1 in the undistorted far-field.

Characteristics

-	H Field transmit loop, passive	-	3/8“ camera thread for mounting on tripods
-	Frequency range 9 kHz – 30 MHz	-	Fully shielded
-	Constant H field, strength independent of frequency	-	Application: transmit 100 W