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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 ...
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.
The AN/FLR-9 is a type of very large circularly disposed antenna array, built at eight locations during the Cold War for HF/DF direction finding of high priority targets. The worldwide network, known collectively as "Iron Horse", could locate HF communications almost anywhere on Earth.
Dyson Ball Animal 2 $499.99 at Amazon. Dyson Ball Animal 2 $499.00 at Home Depot. Dyson Ball Animal 2 $499.00 at Abt. Kenmore Pet Friendly Cross-Over DU3017. CR's take: A recent addition to our ...
The FT-1000MP is an amateur radio ("ham") transceiver series, built by Yaesu.It is an "all-mode" set, operating in the high frequency (HF) frequency range. The "MP" suffix in the name was an homage to Sako Hasegawa, the late founder of the company whose callsign was JA1MP, and who heavily influenced the design and feature set built into this radio.
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Radio direction finding equipment for eighty meters, an HF band, is relatively easy to design and inexpensive to build. Bearings taken on eighty meters can be very accurate. Competitors on an eighty-meter course must use bearings to determine the locations of the transmitters and choose the fastest route through the terrain to visit them.