This paper covers the design, analysis, manufacture and testing of an experimental rig for aeroacoustic measurements on high aspect ratio rectangular jets. The design of the rig is detailed with emphasis given to flow control and acoustic characteristics. Results of the far-field noise spectra and directivity are presented from the initial tests. These show that the jet noise is notably directional about both the major and minor jet axes and that the peak frequency component is weakly dependant on both aspect ratio and Mach number. The 'zone of silence' close to the streamwise axis can also be seen clearly. Flow visualisation tests were also conducted that showed how the flow develops close to the nozzle.
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