Shortwave radio receiver

National Radio Company introduced the SW-2 "Thrill box" shortwave regenerative receiver in 1927, and later offered improved models, such as the highly regarded SW-3.

[5] Hallicrafters introduced the "Super Skyrider" in 1935, a superheterodyne shortwave receiver available in several different models that covered the broadcast band up to 30 MHz.

[3] Following development of several prototypes between 1939 and 1941, Zenith introduced the Model 7G605 Trans-Oceanic 'Clipper' in 1942, an early portable shortwave receiver marketed to consumers.

The Magnavox model AW-100 was introduced in 1957 and was among the first commercial fully transistorized shortwave radio receivers,[9] along with the Trans-Oceanic Royal 1000 (1957)[10][11][12] and Trans-World Portable T-9 Code 126 (1958).

Serious hobbyists may use communications receivers and outdoor antenna located away from electrical noise sources, such as a dipole made from wire and insulators.

Others offer continuous tuning over the whole shortwave frequency range, allowing the user to listen to amateur radio, marine, air, and utility stations as well as broadcasters.

Tuners on analog receivers may include a bandspread control to allow accurate tuning of closely spaced frequencies.

Receivers with digital tuning usually allow direct entry of frequencies with sufficient accuracy and precision so as not to require additional fine-tuning adjustment.

In pure software-defined radios, all filtering, modulation and signal manipulation is done in software, usually by a PC soundcard or by a dedicated piece of DSP hardware.