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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.
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.
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. Shortwave radio receivers are often used by dedicated hobbyists called shortwave listeners.
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 ...
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Modern communications receiver, ICOM RC-9500 Communications receiver or shortwave receiver - a general purpose audio receiver covering the LF, MF, shortwave , and VHF bands. Used mostly with a separate shortwave transmitter for two-way voice communication in communication stations, amateur radio stations, and for shortwave listening.
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Switzerland said on Tuesday it was concerned by U.S. President-elect Donald Trump's proposals to raise tariffs and is considering how to respond if his new administration does so. Trump aims to ...