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One of the key advances was the introduction of the cavity magnetron in 1940. [9] One of the reasons for the intense interest in microwaves was the issue of antenna size; in the VHF region, radar antennas were on the order of metres long, which made them difficult to use on night fighters. In contrast, the magnetron produced wavelengths of 9 cm ...
It operated in the 1,130 to 3,000 kHz frequency range with a transmission power of 80 Watts. It was used with a two-metre antenna. Reconnaissance units later in the war. FuG 13: A Fug 6 with two receivers rather than one. FuG 14: Multi-radio setup consisting of several separate radios. FuG 15: A HF receiver. It operated in the 23,000 to 24,950 ...
On May 24, 1940, the FCC had announced the establishment, effective January 1, 1941, of an FM radio band operating on 40 channels spanning 42–50 MHz, with the first five channels (42.1 to 42.9 MHz) reserved for educational stations, and the other 35 (43.1 to 49.9 MHz) available for commercial operation. [1]
The Wireless Set No. 19 was a Second World War mobile radio transceiver designed for use by armoured troops of the British Army. First introduced in 1940, the No. 19 began to replace the pre-war Wireless Set No. 11. Two modified versions were introduced, Mk. II in 1941 and Mk. III in 1942.
AN/CRN - Cryptographical Radio Navigation Equipment Designation Purpose/Description Sites/Users Manufacturer AN/CRN-1: Low-frequency parachute navigation/homing buoy radio beacon [110] AN/CRN-2: Trailer mounted 30-foot mast antenna instrument landing glide path transmitter [111] AN/CRN-3
Radio direction finding was a widely used technique even before World War I, used for both naval and aerial navigation.The basic concept used a loop antenna, in its most basic form simply a circular loop of wire with a circumference decided by the frequency range of the signals to be detected.
The U.S. Signal Corps used the term "sets" to denote specific groupings of individual components such as transmitters, receivers, power supplies, handsets, cases, and antennas. SCR radio sets ranged from the relatively small SCR-536 "handie talkie" to high-powered, truck-mounted mobile communications systems like the SCR-299 and large microwave ...
Low-frequency radio range audio signals: N stream, A stream and combined uniform tone (simulated sounds) The low-frequency radio range, also known as the four-course radio range, LF/MF four-course radio range, A-N radio range, Adcock radio range, or commonly "the range", was the main navigation system used by aircraft for instrument flying in the 1930s and 1940s, until the advent of the VHF ...
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