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KH30251 type wideband whip active antenna user guide
With the establishment and development of electromagnetic compatibility specifications, the detection of interference signals from weak electromagnetic fields in space is very necessary. The antenna coefficients (also called effective antenna heights) of passive whip antennas (for measuring electric fields) and loop antennas (for measuring magnetic fields) are in the frequency range of 9KHz ~ 30MHz, and their antenna coefficients are about 90dB ~ from low frequency to high frequency. 25dB, so even with the best contemporary EMI test receiver, it is difficult to detect field strength below 70dB (of course, if the measured field is stronger than 100dB passive antenna can be used). The International Special Committee on Interference (CISPR) publication 16 clearly stipulates that the use of active antennas conforming to the CISPR specification is allowed. The design basis of the KH30251 wideband whip active antenna is based on this. It is suitable for automatic measurement occasions.
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