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  2. R-390A - Wikipedia

    en.wikipedia.org/wiki/R-390A

    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.

  3. Shortwave radio receiver - Wikipedia

    en.wikipedia.org/wiki/Shortwave_radio_receiver

    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.

  4. 75A-4 and KWS-1 - Wikipedia

    en.wikipedia.org/wiki/75A-4_and_KWS-1

    The Collins 75A-4 amateur radio receiver. The 74A4 and KWS-1 is an amateur radio receiver and transmitter pair made by the Collins Radio Company of Cedar Rapids, Iowa that were introduced in 1955. They were designed to operate using the then new single-sideband (SSB) voice modulation as well as CW and AM modes. They were influential in ...

  5. List of communications receivers - Wikipedia

    en.wikipedia.org/wiki/List_of_communications...

    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

  6. Rockwell Collins - Wikipedia

    en.wikipedia.org/wiki/Rockwell_Collins

    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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