Roberts Radio

Roberts is a consumer electronics limited company now based in Mexborough, South Yorkshire, England. It has been producing radios for over 80 years. Initially the company only traded in the United Kingdom, but now exports worldwide. The company was initially based in central London, near Oxford Circus and then at Rathbone Place, but moved to East Molesey in 1941. In 1962, the company had a purpose-built factory constructed in West Molesey, and still retains premises in the area. The company has been granted three Royal warrants in its own right, and one via the purchase of Dynatron Radio Ltd, in 1981.

The company was founded in 1932 by Harry Roberts and Leslie Bidmead
They financed the down payment on a small factory by selling Bidmead's motorbike.

The first models featured a distinctive Aladdin's lamp fretwork loudspeaker grille, but by the late 1930s the company had settled on an upright box shape set covered in coloured leathercloth with fabric loudspeaker grille - a style that they would keep to and evolve slowly with each progressive model.

Roberts

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Radio

Radio is the use of radio waves is to carry information, such as sound, by systematically modulating some property of electromagnetic energy waves transmitted through space, such as their amplitude, frequency, phase, or pulse width. When radio waves strike an electrical conductor, the oscillating fields induce an alternating current in the conductor. The information in the waves can be extracted and transformed back into its original form.

Radio systems need a transmitter to modulate (change) some property of the energy produced to impress a signal on it, for example using amplitude modulation or angle modulation (which can be frequency modulation or phase modulation). Radio systems also need an antenna to convert electric currents into radio waves, and vice versa. An antenna can be used for both transmitting and receiving. The electrical resonance of tuned circuits in radios allow individual stations to be selected. The electromagnetic wave is intercepted by a tuned receiving antenna. A radio receiver receives its input from an antenna and converts it into a form usable for the consumer, such as sound, pictures, digital data, measurement values, navigational positions, etc. Radio frequencies occupy the range from a 3 kHz to 300 GHz, although commercially important uses of radio use only a small part of this spectrum.