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The R-390A military shortwave radio receiver was the result of a project undertaken by the United States Army Signal Corps in 1954 to replace the existing R-390 receiver then in use. The R-390 had done its job so well that the Corps decided continued use of this type of receiver necessitated an improved, reduced-cost version.
The Collins mechanical filter was introduced to consumers in the 75A-3, and the 75A-4 was one of the first receivers marketed specifically as a single sideband receiver. Collins R-390A radio receiver. Around 1950, Collins began designing the R-390 (500 kHz — 30 MHz) for the US military. This was intended to be a receiver of the highest ...
Modern portable shortwave radio receiver with digital frequency display and keypad for direct frequency entry. A shortwave radio receiver is a radio receiver that can receive one or more shortwave bands, between 1.6 and 30 MHz. A shortwave radio receiver often receives other broadcast bands, such as FM radio, Longwave and Mediumwave.
This is a list of rack-mount or tabletop communications receivers that include short wave frequencies. This list does not include handheld, portable or consumer grade equipment. Those that include VHF or UHF can be termed wideband receivers, whereas those without HF would be termed scanners, or surveillance receivers.
Collins S-Line, featuring separate power supply, receiver, transmitter, and speaker console, c. 1960s. Amateur radio equipment of past eras like the 1940s, 50s, and 60s that are separate vacuum tube transmitters and receivers (unlike modern transceivers) are an object of nostalgia, and many see rehabilitation and on-air use by enthusiasts. [18 ...
Midway through the 4-Line's run, in 1967, Drake introduced a receiver and transmitter pair meant for the Novice licensee - the 2-C receiver and 2-NT transmitter. The 2-C was an improved receiver based on the 2-B design using a few more solid state devices. Thus, it was a sophisticated design compared to most other receivers targeting Novices.
At the center of the debate is a comparison not only of the individual teams but of the two leagues. The argument is fascinating in an era of college football where the power leagues continue to ...
Ultimately shortwave relays for network programming was determined to be inferior to dedicated telephone line connections, and the transmissions to KFKX ended, with the Hastings operation closing on June 1, 1927. [6] In 1922, a 1 kW shortwave transmitter was installed at Westinghouse's factory in East Pittsburgh, Pennsylvania, with call sign ...
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