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The receiver weighs 85 pounds (39 kg) and can be operated on 120-volt or 240-volt supplies. It fits neatly into a 10.5-inch-tall (270 mm) standard 19-inch rack . [ 2 ] : 6 [ 3 ] Tuning of the R-390A's radio frequency and intermediate frequency front end is synchronized by means of an ingenious mechanical system of racks, gears, and cams.
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 ...
Collins: 51J-4 Professional 1955 .54-30.5 30 bands CW AM 12 Collins R-390 Government Collins R-390A Government 1955-1970 .5-32 double conversion 32 band valve AM CW FSK 0.1 1 2 4 6 16 16 0 1 Cubic: R-2411V Professional dual receivers AM CW FSK LSB USB 0.5 1 3 8 100 per side 4 44 2 Cubic R 3050 Professional 5 21 2 Cubic R-3500-20 Government LF MF HF
RadioShack (formerly written as Radio Shack) is an American electronics retailer, which was established in 1921 as an amateur radio mail-order business. Its original parent company, Radio Shack Corporation, was purchased by Tandy Corporation in 1962, shifting its focus from radio equipment to hobbyist electronic components.
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 ...
Many were dedicated types with special functions, such as VHF receivers for police and fire channels built into a CB radio. The company's best selling products were often shortwave receivers, parts, and portable radios. In the 1960s, many Lafayette brand radios were rebranded Trio-Kenwood sets. A significant share of 1960s and 1970s vintage ...
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Domestic Afrikaans-language radio service operated by the SABC. Used shortwave to reach remote areas of South Africa. Shortwave transmissions discontinued with closure of Meyerton transmitter but remains available on FM, satellite, and online. [11] South Korea KBS World Radio: 1953 Yes Yes KBS Hanminjok Radio: 1972 Yes Jammed by North Korea ...
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