Hypersonic effect Hypersonic effect The hypersonic effect is a term coined to describe a phenomenon reported in a controversial scientific study by Tsutomu Oohashi et al., which claims that, although humans cannot consciously hear ultrasound (sounds at frequencies above approximately 20 kHz), the presence or absence of those frequencies has a measurable effect on their physiological and psychological reactions. Numerous other studies have contradicted the portion of the results relating to the subjective reaction to high-frequency audio, finding that people who have "good ears" listening to Super Audio CDs and high resolution DVD-Audio recordings on high fidelity systems capable of reproducing sounds
60-meter band assignments with center frequencies 5373 kHz and 5405 kHz on a secondary non interference basis for propagation experiments with a maximum mean power not exceeding 27 dBW (500 Watts). Canada ( ITU Region 2 ): On Wednesday 22 January 2014, the Canadian regulator, Industry Canada (IC) released a decision to allow amateur radio operators to use the 5332 kHz, 5348 kHz, 5358.5 kHz, 5373 kHz and 5405 kHz (channel centre) frequencies on a no-interference, no-protection basis, 2.8 kHz bandwidth, same modes as U.S., 100W PEP maximum power. These are the same channels, modes and criteria as those available to US