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1. [RFI] Ultrasonic Line Noise Detectors (score: 1): Author: Jimk8mr@aol.com; Date: Mon, 26 Apr 2010 18:49:28 EDT; In the May issue of CQ my eye caught an ad for an Ultrasonic Receiver Kit (page 113): http://www.midnightscience.com/ultrasonics.html This appears to be essentially the entire receiver portion of the; /archives//html/RFI/2010-04/msg00054.html (6,779 bytes)
2. Re: [RFI] Ultrasonic Line Noise Detectors (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Mon, 26 Apr 2010 18:38:24 -0700; The QST project reportedly works, but is far from an optimal design. The high gain (read narrow beamwidth) transducer recommended doesn't properly illuminate the very low f/d dish and the frequency d; /archives//html/RFI/2010-04/msg00055.html (8,399 bytes)

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