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Technical Paper

The Reinvention of the Wheel: Progress in Car Radios and Their Future

Advances in digital and analog electronics have drastically changed car radio circuitry. Improvements in miniaturization of electrical and mechanical components have radically altered their size and styling. Computer modeling of the vehicle's interior environment has optimized car radio acoustics. It seems that the list of modern break-throughs is never ending. It is the intent of this paper to show that many of the technical marvels of today's car radios were first applied years, even decades, ago. From those early concepts, and their current revivals, a projection into the future of automobile radios will be made. As previously mentioned [1]: “If history teaches anything, it teaches the potential for repetition.”
Technical Paper

World Radio Revisited: Still a Myth?

As in most industries, car radio designers have long envisioned a product which could be sold without modification throughout the world. However, local requirements, performance differences, and customer preferences have presented major obstacles to achieving this goal. Since publishing a previous paper on this subject in 1983, many changes have taken place in electronics and in car radio design. Some of these changes have reduced the barriers to producing a “World Radio” while others have presented new obstacles to be overcome. This paper addresses some of those changes and the current possibilities.
Technical Paper

The Evolution of the Automobile Antenna in the United States and Europe — A Historic Retrospective — Part Two — The Last Fifty Years

The evolution and development of the automobile radio antenna is perhaps one of the most neglected success stories in the automotive industry. Born in the twilight of the last century, it evolved from a simple wire wrapped around a tree branch, to the current heated rear screen or backlite antenna. Part One (SAE No. 870090) described seven types of antennas in detail, covering the period 1897-1937. It was shown how the early radio engineers, struggling to develop a viable car antenna, had displayed a great degree of creativity and flexibility, from the “firecracker” experiments of Guglielmo Marconi in 1897, to the ingenious systems developed to overcome the problems created by the all-metal Turret-Top vehicles introduced by General Motors in 1934. In those pioneering days, the United States public was having a love affair with both the automobile and radio broadcasting, so it was no surprise that their marriage did not take long to arrive.
Technical Paper

The Evolution of the Automobile Antenna in the United States and Europe-A Historic Retrospective, Part One: The First Forty Years

While one probably tends to think that car radios were invented and developed in the United States during the early twenties, it was actually in Chelmsford, England, that the first mobile experiments took place. Designed by Guglielmo Marconi, the first mobile installation antenna on record goes back to 1897. On the other side of the Atlantic, the experiments of Guglielmo Marconi were continued by the Americans Lee Deforest and Edwin Armstrong, who set the foundations of radio early in the twentieth century. Lee DeForest had been one of the prime advocates of “automobiles as wireless stations.” Early in 1903, and as told by a magazine of that era, “he fitted his instruments to automobiles so that the electricity which propels the automobile while in motion can be used for wireless telegraphy when the automobile is at a standstill”.
Technical Paper

Radio Noise Suppression: Science or Black Art?

This paper will address radio suppression development beginning with auto radio installations in the early 1920s. Early suppresion problems and attempts to develop meaningful corrective actions will be discussed in detail. Ongoing suppression development beyond the early 1920 era, will be traced forward to approximately 1960. Emphasis on special problems created by various radio power energy sources will be examined in terms of solutions, radio design direction, and variability of long- and short-term corrective actions. A brief discussion will center around antennas and its effects on radio suppression. The final portion of this paper will address internal and external electrical and electronic noise sources which ultimately affects basic radio suppression requirements. SINCE THE EARLY MATING of radio receivers to automobiles in the 1920s, radio engineers have been confronted with a never ending challenge known as radio interference suppression.
Technical Paper

World Radio Receiver: Reality or Myth

While recent developments in manufacturing and component technology facilitate the packaging of a basic radio circuit design flexible enough to take into account worldwide markets, many unique and sometimes seemingly superficial specifications stand in the way of a truly “universal” or World Radio chassis. Although somewhat technical in subject matter, this paper does not attempt to address solutions to the problems; rather, it highlights what concerns must be solved before a truly World Radio is achieved.