Radio receivers are as old as radio itself.  After all, radio signals had to be intercepted and converted into an intelligible form to be useful.

At first the signals transmitted and received were Morse code (radio telegraphy).  Fittings aboard ships were mandatory in the first decade of the 20th century (1900's).  But hours of watch were not prescribed.

The Titanic disaster (1912) changed that.  A ship was an hour away but did not hear the Titanic's distress call.  A ship that did hear the distress call was more then three hours away, but rushed to the scene.  By then, the titanic had sunk with great loss of life.

Voice transmissions (radio telephony) came into use in the 1920's.  A frequency was set apart for calling and distress.  Quiet times were prescribed to enable listening for distress calls.

Hallicrafters – S22R

Manufactured by: Hallicrafters

Model: S22R

Hallicrafters – SX-62A

Manufactured by: Hallicrafters

Model: SX-62A

Power Requirements: 115VAC

Frequency Range: 0.54-109MHz

Hallicrafters Co. – Super Skyrider

Manufactured by: Hallicrafters Co.

Model: SX-17

Power Requirements: 115VAC

Frequency Range: 0.55-61 MHz

Hammarlund – HQ100A

Manufactured by: Hammarlund

Model: HQ100A

National Radio Co. – HRO500

Manufactured by: National Radio Co.

Model: HRO500

Power Requirements: 117VAC / 12VDC

Frequency Range: 0.4-30 MHz

National Radio Co. – One Ninety

Manufactured by: National Radio Co.

Model: One Ninety

Marine Communications Receiver

Marine Communications Receivers are used in conjunction with transmitters.  The receivers must be capable of receiving telegraph signals, amplitude modulated, single-side band, frequency modulated, frequency shift (used with facsimile and radio teletype).

ITT Mackay Marine – 3010C

Manufactured by: ITT Mackay Marine

Model: 3010C

Frequency Range: 0.07-30MHz

Redifon – R408

Manufactured by: Redifon

Model: R408

Frequency Range: 0.013-28MHz