Gain compensations for cavities with slot apertures between reverberant and anechoic environments

Mode-stirred chamber and anechoic chamber measurements were made on two sets of canonical test objects with varying numbers of thin slot apertures. The shielding effectiveness was compared to determine the level of correction needed to compensate the mode-stirred data to levels commensurate with anechoic data from the same test object. The cylinders with varying number of slot apertures had very different corrections needed to compensate the mode-stirred chamber data correctly. For a single slot aperture an unintentional emitter correction plus 4 dB was needed, while the two and eight slot cylinders needed the Sandia correction factor to bring the levels up. The rectangular cavity with varying number of slot apertures had interesting results, in that the same correction factor, namely the unintentional emitter plus 4 dB, worked the best for one, two, and four apertures.