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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.
The array consisted of a ring of 120 vertical monopoles covering 2–20 MHz. Tall wood poles supported a 1,000-foot diameter (300 m) circular screen of vertical wires located within the ring of monopoles. His research is still used today to guide the design and site selection of HF/DF arrays. Records of his research are available in the ...
Philippines: Semi-automatic pistol.45 ACP: TAC Ultra FS HC 45 ACP: 3,000 acquired by Armed Forces of the Philippines in 2017, for issue to all service branches. Majority went to the Philippine Army. [101] [102] AFP ordered 60,000 units under AFP 0.45 caliber Hammer Fired Pistol acquisition project, majority expected to go to the Philippine Army ...
AyosDito.ph was an online classified-ads website for Filipinos to buy and sell online, regardless of their location in the Philippines. It was owned and operated by 701Search Pte. Ltd. , which is a joint venture between media giants Singapore Press Holdings and Schibsted .
The primary HFGCS voice frequencies are 4724.0 kHz, 8992.0 kHz, 11175.0 kHz, and 15016.0 kHz. In addition to the HFGCS, U.S. aircraft frequently use Military Auxiliary Radio System (MARS) HF stations (13927.0 kHz) and Canadian Forces HF stations (11232.0 kHz) to relay messages. Various other discrete frequencies are available, and used, as part ...
Maxwell K. Goldstein (January 15, 1908 – February 18, 1980) was a first generation Jewish-American scientist and engineer who was instrumental in the development and deployment of high-frequency direction finding by the United States Navy during the Second World War.
Power supplies are categorized in various ways, including by functional features. For example, a regulated power supply is one that maintains constant output voltage or current despite variations in load current or input voltage.
CD-R King proprietors Nicholson Santos and Henry Ngo opened its first shop in Paterno Street, Quiapo, Manila.It was initially known for selling recordable media in bulk at a fraction of the cost in the early 2000s, later expanded their line to other products in response to changing market and technological trends over the years, even going so far as to offering goods which have little or ...