Hi everyone, I am wondering if anyone in the forum has come across the following problem: A 10kHz to 13.5kHz excess emission (to both the DEF STAN 59-411 Air and MIL-STD-461F Air external specs) when using a Rod antenna. This excess emission occurs with both active and passive rod antennas. The chamber has been checked to ensure that all supplies are off, lights off, no cables going in or out of the chamber with the exception of the measureing cable connected to the receivers (R&S ESIB 7 & ESU26). The measureing cable has been connected via a through bulk head connector in the chamber wall (bonded) and isolated connector with no difference observed. This problem has only recently come to light as previous measurements to DEF STAN 59-41 and MIL-STD461A-C issues lowest frequency 14kHz and testing to MIL-STDs Issues D to F there has been so far no requirements to measure down to 10kHz. There is no problem with conducted measurements to either MIL-STD or DEF STAN at this frequency range. Can anyone shed a light on what may be the cause of this problem? Regards Andy Andrew P. Price
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