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If you've not already done so it's important to read this article by Franco Rota:https://www.rf-microwave.com/app/resources/uploads/diodes/VHFComm_NW303.pdfHere is more information and nice color pictures of the prototype and the final design.www.eme2008.org/papers/Lab%20equipment/i5sxn_Noise%20generator.pdfFranco presents some important information about the self resonance effects of SMD device orientation and the issue of enclosure resonances.I'd like to have a precision noise source without having to spend $$$. A question for EVS: Would a precision current source flatten out the spectrum shown on the SA? It seems to me that current variations during the sweep might account for some of the variation in apparent output. Of course, averaging would eliminate those. Could you show an expanded vertical scale with and without averaging?