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Acoustix is a Dallas, Texas -based quartet that won the 1990 International Quartet Championship of SPEBSQSA (now Barbershop Harmony Society, or BHS). They have all, at different times, been members of the Dallas -based Vocal Majority chorus. Acoustix shot to fame in 1990 at their first SPEBSQSA International Contest appearance in San Francisco ...
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High frequency (HF) is the ITU designation [1] for the band of radio waves with frequency between 3 and 30 megahertz (MHz). It is also known as the decameter band or decameter wave as its wavelengths range from one to ten decameters (ten to one hundred meters). Frequencies immediately below HF are denoted medium frequency (MF), while the next ...
WWV is a shortwave ("high frequency" or HF) radio station, located near Fort Collins, Colorado. It has broadcast a continuous time signal since 1945, and implements United States government frequency standards, with transmitters operating on 2.5, 5, 10, 15, and 20 MHz. [1] WWV is operated by the U.S. National Institute of Standards and ...
High-frequency direction finding, usually known by its abbreviation HF/DF or nickname huff-duff, is a type of radio direction finder (RDF) introduced in World War II. High frequency (HF) refers to a radio band that can effectively communicate over long distances; for example, between U-boats and their land-based headquarters.
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The sweeping, diagonal line is the CODAR signal. Coastal ocean dynamics applications radar (CODAR) is a type of portable, land-based, high frequency (HF) radar developed between 1973 and 1983 at NOAA 's Wave Propagation Laboratory in Boulder, Colorado. CODAR is a noninvasive system that can measure and map near-surface ocean currents in coastal ...