Electronics World articles Popular Electronics articles QST articles Radio & TV News articles Radio-Craft articles Radio-Electronics articles Short Wave Craft articles Wireless World articles Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs LinkedIn Crosswords Engineering Humor Kirt's Cogitations RF Engineering Quizzes Notable Quotes Calculators Education Engineering Magazine Articles Engineering software RF Cafe Archives RF Cascade Workbook 2018 RF Symbols for Visio - Word Advertising Magazine Sponsor RF Cafe RF Electronics Symbols for Visio RF Electronics Symbols for Office Word RF Electronics Stencils for Visio Sponsor Links Saturday Evening Post NEETS EW Radar Handbook Microwave Museum About RF Cafe Aegis Power Systems Anritsu Alliance Test Equipment Amplifier Solutions Anatech Electronics Axiom Test Equipment Berkeley Nucleonics Centric RF Conduct RF Copper Mountain Technologies Empower RF everything RF Exodus Advanced Communications Innovative Power Products ISOTEC KR Filters Lotus Systems PCB Directory Rigol San Francisco Circuits Reactel RFCT TotalTemp Technologies Triad RF Systems Windfreak Technologies Withwave LadyBug Technologies Wireless Telecom Group Sponsorship Rates RF Cafe Software Resources Vintage Magazines Thank you for visiting RF Cafe!
Exodus Advanced Communications Best in Class RF Amplifier SSPAs - RF Cafe
Electronics Pioneers History

Ampere's Law, December 1972 Popular Electronics - RF CafeAndre Marie Ampere

André-Marie Ampère (1775-1836) was a French physicist and mathematician who is considered to be one of the founding fathers of electromagnetism. He made numerous contributions to the study of electricity and magnetism, including the discovery of the basic principles of electromagnetism and the development of the theory of electrodynamics.

Ampère was born in the city of Lyon, France, and showed an early aptitude for mathematics and science. He studied at the École Polytechnique in Paris and later taught mathematics there. During his lifetime, he made important contributions to several fields, including physics, mathematics, chemistry, and astronomy.

One of Ampère's most significant contributions to science was his discovery of the relationship between electricity and magnetism. He discovered that when an electric current flows through a conductor, it creates a magnetic field around the conductor. This discovery led to the development of electromagnetism, which became one of the most important branches of physics.

Ampère also developed a mathematical theory to describe the interaction between electric currents and magnetic fields. This theory, known as Ampère's law, states that the magnetic force between two currents is proportional to the product of the currents and the distance between them. This law is still used today in the design of electrical and electronic devices, such as motors and generators.

In addition to his work on electromagnetism, Ampère also made important contributions to the study of chemistry and astronomy. He discovered the relationship between electricity and chemical reactions, which led to the development of electrochemistry. He also made observations of the sun and planets, and proposed a theory to explain the motions of celestial bodies.

In recognition of his many contributions to science, the standard unit of electrical current, the ampere, was named after him. Today, Ampère's legacy continues to inspire new generations of scientists and engineers, who build upon his work to advance our understanding of electricity and magnetism.

Arthur Atwater Kent (wikipedia image) - RF CafeArthur Atwater Kent

Atwater Kent was an American inventor, entrepreneur and manufacturer of radio equipment. He was born on December 12, 1873, in Cassopolis, Michigan and died on August 30, 1949, in Philadelphia, Pennsylvania. He was a pioneer in the development of radio technology and his impact on the industry is still felt today.

Kent began his career as an electrical engineer, working for various companies before starting his own business in 1918. He founded the Atwater Kent Manufacturing Company in Philadelphia, Pennsylvania, with the goal of producing high-quality radio sets for the public. The company quickly became one of the largest radio manufacturers in the United States, producing over one million radio sets between the 1920s and 1930s.

One of Kent's innovations was the development of the "breadboard" radio set, which was easy to assemble and repair. He also made use of more efficient components, such as high-voltage power supplies, which allowed his radio sets to produce better sound quality. His radios were also known for their beautiful wooden cabinets, which were handcrafted and came in a variety of styles and finishes to suit any decor.

Atwater Kent was a visionary who understood the potential of radio as a means of communication and entertainment. He was an advocate for the development of commercial radio broadcasting and he supported the establishment of the National Broadcasting Company (NBC) in 1926. This network helped to bring radio to a wider audience and it was a major factor in the growth of the radio industry.

In addition to his contributions to the radio industry, Kent was also a philanthropist. He supported a number of educational and scientific organizations, including the Franklin Institute, and he established the Atwater Kent Foundation, which provided grants for scientific research.

Major Edwin Howard Armstrong - RF CafeMajor Edwin Howard Armstrong

Major Edwin Armstrong was an American electrical engineer and inventor who is widely credited with the invention of frequency modulation (FM) radio. FM radio is a method of radio transmission that uses frequency modulation to provide high-fidelity sound over radio waves.

Armstrong first developed FM radio technology in the early 1930s, after many years of experimentation with radio technology. FM radio offered many advantages over the existing AM radio technology, including better sound quality, less interference, and greater immunity to noise.

However, despite the clear advantages of FM radio, Armstrong faced significant opposition from the radio industry, which was heavily invested in AM radio and resistant to change. In the 1940s and 1950s, Armstrong engaged in a series of legal battles with the industry, fighting for the recognition and adoption of FM radio.

Sadly, Armstrong's life was plagued by personal and financial difficulties, and he suffered from depression. In 1954, he committed suicide by jumping from the thirteenth floor of his New York City apartment building.

Despite his tragic end, Armstrong's contributions to the development of radio technology have had a lasting impact. FM radio has become the standard method of radio transmission for music and high-fidelity audio, and is still widely used today in broadcasting, mobile communications, and other applications.

There are several biographies of Major Armstrong, including "Major Armstrong: Architect of FM Broadcasting" by Loren W. Acton and "Empire of the Air: The Men Who Made Radio" by Tom Lewis. These biographies detail his life, including his early experiments with radio technology and his invention of FM radio.

Major Edwin Armstrong was involved in several patent lawsuits during his lifetime, particularly in relation to his invention of frequency modulation (FM) radio. Here are some key examples:

Patent disputes with Lee De Forest: In the 1910s and 1920s, Armstrong became embroiled in a series of legal battles with the American inventor Lee De Forest over patents related to radio technology. Armstrong claimed that De Forest's patents were invalid and that he himself had made the key breakthroughs in radio transmission. The dispute was eventually settled in Armstrong's favor in 1934, after many years of litigation.

Patent disputes with RCA: In the 1930s and 1940s, Armstrong was involved in several patent lawsuits with the Radio Corporation of America (RCA), one of the largest radio manufacturers in the world. RCA had initially expressed interest in FM radio technology, but eventually abandoned it in favor of its own system, known as amplitude modulation (AM). Armstrong claimed that RCA had stolen his ideas and infringed on his patents. The legal battles between Armstrong and RCA were long and contentious, and included appeals to the US Supreme Court. In the end, however, RCA was able to use its greater financial resources to outlast Armstrong in court.

Personal financial difficulties: Throughout his life, Armstrong struggled with personal and financial problems. He invested much of his own money into developing and promoting FM radio, but he was unable to profit from it due to the opposition of the radio industry and the prolonged legal battles. In addition, Armstrong's wife suffered from mental illness and required expensive medical treatment, further draining his finances. These financial pressures may have contributed to Armstrong's decision to take his own life in 1954.

Overall, Armstrong's legal battles highlight the challenges faced by inventors and innovators in the face of opposition from established industries and powerful corporations.

Heinrich Georg Barkhausen Stamp - RF CafeHeinrich Barkhausen

Heinrich Georg Barkhausen (1881-1956) was a German physicist who made important contributions to the study of electromagnetism and solid-state physics. He is best known for his discovery of the Barkhausen effect and Barkhausen noise, which occur in ferromagnetic materials.

Barkhausen studied physics at the University of Berlin, where he earned his doctorate in 1907. After working as a research assistant for several years, he became a professor at the Technical University of Dresden in 1920.

In 1919, Barkhausen discovered the phenomenon of Barkhausen noise, which is the noise caused by the movement of magnetic domains in a ferromagnetic material. His work on the Barkhausen effect provided important insights into the behavior of ferromagnetic materials and helped to establish the field of solid-state physics.

Barkhausen also made significant contributions to the study of electrical oscillations and electromagnetic waves. He developed a method for measuring the frequency of high-frequency electrical oscillations, known as the Barkhausen-Kurz method, which is still used today.

During World War II, Barkhausen worked on the development of radar technology for the German military. After the war, he was briefly held as a prisoner of war by the Allies before returning to his academic work. Barkhausen received many honors during his career, including the Max Planck Medal and the Hughes Medal.

Jacques Bernoulli Portrait - RF CafeJacques Bernoulli

Jacques Bernoulli (1654-1705) was a Swiss mathematician who, along with his brother Jean Bernoulli, was instrumental in the development of calculus and the application of mathematical principles to various fields.

Jacques Bernoulli was born into a family of mathematicians in Basel, Switzerland, and showed an early aptitude for mathematics. He studied at the University of Basel and then went on to study in Italy, France, and the Netherlands. In 1687, he became a professor of mathematics at the University of Basel, where he remained until his death.

Bernoulli made significant contributions to a variety of mathematical fields, including calculus, number theory, probability theory, and physics. He is best known for his work on the calculus of variations, a branch of mathematics that deals with finding the optimal solution to a problem. In particular, he is famous for the "brachistochrone problem," which involves finding the path taken by a particle that travels between two points in the shortest time possible under the influence of gravity.

Bernoulli also made significant contributions to the study of probability theory. In 1713, he published "Ars Conjectandi," a book on probability that introduced the concept of the Bernoulli distribution, which is named after him and is still widely used in modern statistics.

Karl Kurz

Karl Kurz, together with Heinrich Barkhausen, discovered the Barkhausen-Kurz oscillations, also known as the Barkhausen-Kurz effect, in 1919. This effect refers to the phenomenon of magnetic domain wall motion in ferromagnetic materials, which produces oscillations in the electrical current passing through the material.

Kurz also contributed to the development of the Kurz tube, an early type of vacuum tube that was used in early radio receivers and transmitters. The Kurz tube was notable for its ability to amplify very high frequencies, making it useful for early experiments in radio and telecommunications.

Overall, Karl Kurz was a key figure in the early development of electronics and his contributions to the study of electronic vibrations were significant.

Niels Bohr (wikipedia image) - RF CafeNiels Bohr

Niels Bohr was a Danish physicist who made significant contributions to the field of quantum mechanics, which revolutionized our understanding of the behavior of atoms and subatomic particles. He was born on October 7, 1885, in Copenhagen, Denmark, and died on November 18, 1962, in the same city.

Bohr received his undergraduate and doctoral degrees from the University of Copenhagen, where he studied under the physicist Christian Christiansen. After completing his doctoral thesis, which was on the properties of metals, he went to work with J.J. Thomson at the Cavendish Laboratory in Cambridge, England, where he learned about the newly discovered phenomenon of radioactivity.

Bohr's most significant contribution to physics was his model of the atom, which he proposed in 1913. The Bohr model of the atom is a simplified representation of the atom that is still taught in schools today. It depicts the atom as a central nucleus surrounded by electrons in specific orbits or energy levels. According to the Bohr model, electrons can move between these energy levels by absorbing or emitting energy in the form of photons.

Bohr's model was significant because it explained many of the experimental observations about the behavior of atoms that could not be explained by classical physics. His model also helped to establish the concept of quantization, which states that energy is not continuous but rather comes in discrete packets or quanta.

In addition to his work on the atomic model, Bohr made significant contributions to the development of quantum mechanics. He proposed the principle of complementarity, which states that particles can exhibit both wave-like and particle-like behavior, depending on how they are observed. This principle is essential to our understanding of quantum mechanics today.

Bohr also played a significant role in the development of nuclear physics. He was one of the first physicists to study the behavior of atomic nuclei and helped to discover the concept of nuclear fission. Bohr was a strong advocate for international cooperation in science and was a vocal opponent of the development of nuclear weapons.

In recognition of his contributions to physics, Bohr received numerous honors and awards, including the Nobel Prize in Physics in 1922. He was also the director of the Institute of Theoretical Physics in Copenhagen, which became a center for research in quantum mechanics and nuclear physics.

Samuel Hunter Christie - RF CafeSamuel Hunter Christie

Samuel Hunter Christie was an English mathematician and physicist who is best known for his work in the field of electricity and magnetism, particularly for his invention of the Wheatstone bridge circuit. He was born on May 8, 1784, in London, England, and died on January 24, 1865, in Willesden, England.

Christie began his career as a civil engineer, but later became interested in mathematics and physics. In the early 1820s, he began conducting experiments on the electrical properties of metals and developed a method for measuring the resistance of wires using a sensitive galvanometer.

In 1833, Christie invented a circuit for measuring the resistance of wires that used a combination of known and unknown resistances, which he called a "differential resistance measurer." This circuit was later improved upon by Charles Wheatstone and became known as the Wheatstone bridge circuit.

Christie also made important contributions to the study of magnetism. In 1826, he discovered the phenomenon of diamagnetism, which occurs when a material is repelled by a magnetic field. He also developed a method for measuring the magnetic properties of materials using a torsion balance, which he described in a paper published in the Philosophical Transactions of the Royal Society in 1833.

In addition to his scientific work, Christie served as a member of the Royal Society and was appointed as the superintendent of the meteorological department of the Board of Trade in 1854. He was also an accomplished linguist and translator, and published several works on the grammar and literature of ancient and modern languages.

Christie's contributions to the field of electricity and magnetism helped pave the way for future advances in the field of electrical engineering, and his invention of the Wheatstone bridge circuit remains an important tool for measuring electrical resistance to this day.

Hans Christian Ørsted - RF CafeHans Christian Ørsted

Hans Christian Ørsted (1777-1851) was a Danish physicist and chemist who made significant contributions to the understanding of electromagnetism. He is most famous for discovering the relationship between electricity and magnetism, which is now known as Ørsted's law. Ørsted was born in Rudkøbing, Denmark, and received his education at the University of Copenhagen, where he later became a professor of physics. Throughout his life, he conducted experiments and research on a variety of scientific topics, including electricity, magnetism, and chemical reactions.

In 1820, Ørsted made a groundbreaking discovery that would change the course of physics forever. While conducting a series of experiments with electricity and magnetism, he noticed that an electric current flowing through a wire caused a nearby compass needle to deflect. This was the first experimental evidence of a relationship between electricity and magnetism, and it provided the foundation for the development of electromagnetism as a branch of physics. Ørsted's discovery was a crucial step in the development of electromagnetism, and it paved the way for future scientists such as Michael Faraday and James Clerk Maxwell to build upon his work and develop a more complete understanding of the behavior of electric and magnetic fields.

In addition to his scientific contributions, Ørsted was also a deeply philosophical and humanitarian individual who believed in the importance of using science for the betterment of humanity. He was a strong advocate for education and scientific literacy, and he worked to promote these ideals throughout his life. Hans Christian Ørsted's legacy lives on through his scientific discoveries and his commitment to using science to improve the world. Today, he is remembered as one of the founding fathers of electromagnetism and a pioneer of modern physics.

Lee DeForest - RF CafeLee DeForest

Lee DeForest was an American inventor and physicist who is widely recognized as a pioneer in the field of radio and electronic communication. He was born on August 26, 1873, in Council Bluffs, Iowa, and grew up in Alabama.

DeForest was educated at the Sheffield Scientific School at Yale University, where he studied under the famous physicist J.W. Gibbs. He later earned a Ph.D. in physics from the University of Berlin, where he studied under the renowned physicist Max Planck.

In 1906, DeForest invented the triode vacuum tube, which allowed electronic signals to be amplified and helped to revolutionize the field of radio communication. He later developed other important electronic devices, including the Audion, a vacuum tube that could detect radio signals, and the oscillating audion, which was used in early radio transmitters.

The audio tube that Lee DeForest invented is known as the triode vacuum tube, also called the Audion. The triode was a significant innovation in the field of electronics because it allowed for the amplification of electronic signals. Prior to its invention, electronic signals could only be transmitted over short distances because the signals would quickly weaken and become distorted.

The triode vacuum tube was first introduced by DeForest in 1906, and it was quickly adopted by radio manufacturers and enthusiasts. The Audion was a three-element vacuum tube that could amplify radio signals, making it possible to broadcast radio signals over longer distances than ever before. This made radio broadcasting commercially viable, and it helped to popularize radio as a means of communication and entertainment.

DeForest continued to work on improving the triode, developing a version that could be used in early radio transmitters. He also worked on other electronic devices, including the oscillating audion, which was used to generate radio frequency signals.

The triode vacuum tube had a profound impact on the development of electronics and communication technology. It laid the groundwork for the development of modern electronics and helped to pave the way for the development of television, computers, and other electronic devices. Today, vacuum tubes are no longer commonly used in electronic devices, having been largely replaced by transistors and integrated circuits, but they remain an important part of the history of technology.

DeForest was a prolific inventor and held over 180 patents for his work in electronics and communication. He also worked as a consultant for several major corporations, including AT&T and RCA.

Lee DeForest was involved in a number of patent lawsuits over the course of his career. One of the most notable was his dispute with the American Telephone and Telegraph Company (AT&T) over the patent for the vacuum tube.

In 1915, DeForest filed a patent application for a "wireless telegraphy" system that used a vacuum tube to amplify signals. However, AT&T claimed that it had patented a similar device, and a lengthy legal battle ensued.

The lawsuit lasted for over a decade, with both sides presenting numerous technical arguments and expert witnesses. Ultimately, in 1927, the Supreme Court of the United States ruled in favor of AT&T, stating that DeForest's vacuum tube was too similar to AT&T's patented device.

The ruling was a significant blow to DeForest's career, as it limited his ability to profit from his inventions and prevented him from developing certain technologies. However, DeForest continued to work as an inventor and consultant, and he made significant contributions to the development of early television and sound recording technology.

Throughout his career, DeForest was a strong advocate for the development of radio as a means of communication and entertainment. He gave numerous lectures and wrote articles and books on the subject, helping to popularize radio and bring it into the mainstream.

Hugo Gernsback - RF CafeHugo Gernsback

Hugo Gernsback (1884-1967) was a Luxembourgish-American inventor, writer, editor, and publisher who is often referred to as the "Father of Science Fiction." He founded several influential science fiction magazines, including "Amazing Stories," which was the first magazine devoted solely to science fiction.

In addition to his work in science fiction, Gernsback was also an inventor and entrepreneur. He was awarded many patents, including patents for early television systems, and founded several companies, including the Gernsback Publications, which published a variety of magazines.

Gernsback was a prolific writer, and he authored many science fiction stories and novels. He also wrote about science and technology in non-fiction works, including his popular book "The Radio Amateur's Handbook."

Today, Gernsback's legacy as a pioneer in the field of science fiction continues to influence writers and readers alike. The Hugo Awards, which are given annually to the best works of science fiction and fantasy, are named in his honor.

Hugo Gernsback's technical magazines included Radio-Electronics, Electronics World, and

Ernest Rutherford (wikipedia image) - RF CafeErnest Rutherford

Ernest Rutherford was a New Zealand physicist who is widely considered one of the most significant scientists of the 20th century. He was born on August 30, 1871, in Nelson, New Zealand, and was the fourth of 12 children in his family. Rutherford was a brilliant student and received a scholarship to attend Canterbury College, where he obtained a Bachelor of Arts degree in Mathematics and Physical Science.

After graduating from college, Rutherford received a scholarship to study at the University of Cambridge, where he worked under the guidance of J.J. Thomson. Rutherford's research focused on studying the properties of radiation emitted by uranium and other radioactive materials. In 1903, he discovered that radiation consists of three types: alpha particles, beta particles, and gamma rays.

In 1908, Rutherford became the head of the physics department at the University of Manchester, where he conducted his famous gold foil experiment. In this experiment, Rutherford fired alpha particles at a thin sheet of gold foil and observed the pattern of deflection of the particles. The experiment showed that atoms have a small, positively charged nucleus at their center, which he called the "atomic nucleus." This discovery revolutionized the field of atomic physics and earned Rutherford the Nobel Prize in Chemistry in 1908.

Rutherford continued to make important contributions to physics throughout his career. He discovered and named the proton, which is a subatomic particle found in the nucleus of an atom. He also proposed the theory of radioactive decay, which explains how radioactive materials break down over time. Rutherford's work helped lay the foundation for nuclear physics, which has led to numerous advancements in science and technology, including the development of nuclear power.

In addition to his scientific achievements, Rutherford was also known for his dedication to teaching and mentoring young scientists. Many of his students went on to become prominent physicists in their own right, including James Chadwick, who discovered the neutron, and Niels Bohr, who developed the theory of the structure of the atom.

Ernest Rutherford died on October 19, 1937, at the age of 66. He is remembered as one of the greatest scientists of all time, and his contributions to the field of physics continue to be studied and built upon today.

Nikola Tesla (Radio-Electronics image) - RF CafeNikola Tesla

Nikola Tesla (1856-1943) was a Serbian-American inventor, electrical engineer, and physicist who is best known for his contributions to the development of the modern alternating current (AC) electrical system. Tesla was born in the town of Smiljan in modern-day Croatia, then part of the Austro-Hungarian Empire.

Tesla attended the Austrian Polytechnic in Graz and later studied at the University of Prague. He immigrated to the United States in 1884 and began working for Thomas Edison's company, where he developed and improved a number of electrical devices. However, Tesla and Edison had a falling out, with Tesla resigning in 1885 due to a disagreement over payment.

Tesla went on to work for several other companies and eventually established his own laboratory, where he worked on developing his own ideas for electrical devices. In 1891, he invented the Tesla coil, a high-voltage transformer that is still used in radio and television technology today.

Tesla also contributed to the development of the AC electrical system, which is now used to power homes and businesses around the world. He was a fierce competitor of Edison, who advocated for the use of direct current (DC) electricity instead of AC. Tesla's AC system won out in the end due to its greater efficiency and the ability to transmit power over long distances. It epic challenge has been called "The War of the Currents" or "The Battle of the Currents."

Tesla held over 300 patents for his inventions, which included the Tesla coil, the Tesla turbine, and the Tesla oscillator. He was also interested in wireless communication and developed a system for transmitting messages and power wirelessly over long distances, but he was unable to secure sufficient funding to continue developing the technology.

Despite his many contributions to science and technology, Tesla struggled financially for much of his life and died in relative obscurity in a hotel room in New York City in 1943. However, his legacy has lived on, and he is now recognized as one of the most important inventors and scientists of the modern era.

Sir Oliver lodge - RF CafeSir Oliver Lodge

Sir Oliver Lodge (1851-1940) was a British physicist and inventor who made significant contributions to the fields of electromagnetism, radio communication, and spiritualism.

Born in Staffordshire, England, Lodge was the eldest of twelve children. He attended University College, London, where he studied physics and mathematics. After completing his degree, he became a physics lecturer at Bedford College in London and later at the University of Liverpool.

In the late 1880s and early 1890s, Lodge became interested in wireless telegraphy, the transmission of messages over long distances using electromagnetic waves. He conducted experiments using radio waves and developed a prototype of a radio receiver.

Oliver Lodge made significant contributions to the field of electromagnetic waves and communication. He is best known for his work on the development of the waveguide, which is a hollow metal tube used to guide electromagnetic waves at high frequencies.

In 1894, Lodge introduced the concept of using a hollow tube to guide electromagnetic waves in a paper titled "On the Propagation of Electric Waves along Wires". He proposed the use of a cylindrical metal tube to guide high-frequency electromagnetic waves, such as those used in wireless telegraphy, instead of the traditional wire antennas.

Lodge's waveguide design was a significant improvement over previous methods of transmitting electromagnetic waves. The waveguide was able to guide the waves with less loss and dispersion, resulting in a more efficient and reliable transmission of signals over long distances.

Lodge's work on the waveguide paved the way for many important developments in the field of electromagnetic waves and communication, including the development of microwave technology and the design of radar systems. Today, waveguides are widely used in a variety of applications, including satellite communication, radar systems, and microwave ovens.

During World War I, Lodge worked on developing a form of underwater communication using electromagnetic waves. He also helped to design a listening device used to detect submarines.

Lodge was a Fellow of the Royal Society and served as its president from 1920 to 1925. He was knighted in 1902 for his contributions to science.

In addition to his work in physics, Lodge was also interested in spiritualism, the belief in communication with the dead. He attended séances and claimed to have communicated with his deceased son, Raymond. He wrote several books on the subject, including "The Survival of Man" (1909).

Sir Oliver Lodge died in 1940 at the age of 89. He is remembered as a pioneering physicist and inventor who made significant contributions to the development of wireless telegraphy and electromagnetic theory.

Sir Joseph John (J.J.) Thompson - RF CafeSir Joseph John (J.J.) Thompson

Joseph John Thompson (also known as J.J. Thomson) was a British physicist born on December 18, 1856, in Cheetham Hill, Manchester, England. He is best known for his discovery of the electron, for which he was awarded the Nobel Prize in Physics in 1906.

Thompson studied at Owens College in Manchester and Trinity College, Cambridge, where he became a fellow in 1884. He held a number of academic positions throughout his career, including professorships at the University of Cambridge and the Imperial College of Science and Technology in London.

Thompson's most famous experiment involved the use of a cathode ray tube, which allowed him to demonstrate the existence of negatively charged particles, which he called electrons. He also discovered that these particles had a much smaller mass than previously believed, and he proposed a model of the atom known as the "plum pudding" model, in which electrons were embedded in a positively charged sphere.

Thompson made many other contributions to the field of physics throughout his career, including work on the nature of X-rays, the behavior of gases at low pressures, and the measurement of the charge-to-mass ratio of the electron. He is also credited for first proposing waveguide transmission of electromagnetic waves in a cylindrical metal cavity.

Thompson died on August 30, 1940, in Cambridge, England, at the age of 83. He is remembered as one of the most important physicists of the late 19th and early 20th centuries, and his work laid the foundation for many later discoveries in the field of particle physics.

David Sarnoff - RF CafeDavid Sarnoff

David Sarnoff (February 27, 1891 - December 12, 1971) was a Belarusian-American businessman and pioneer in the field of radio and television broadcasting. He was born in Uzlyany, a small village in present-day Belarus. He was the eldest of eight children born to a Jewish family. When he was nine years old, his family immigrated to the United States and settled in New York City.

As a child, Sarnoff attended school but had to drop out after the sixth grade to help support his family. He began working as a messenger boy for the Commercial Cable Company, where he delivered messages by hand between offices in New York City. He later worked for the American Telephone and Telegraph Company (AT&T), where he learned about the emerging field of wireless telegraphy.

In 1906, Sarnoff began working as an office boy for the Marconi Wireless Telegraph Company of America. He quickly impressed his superiors with his intelligence and work ethic and was promoted to telegraph operator. In this role, he  famously sent the first ever radio message to a ship at sea, alerting the crew of the sinking of the Titanic, which helped to establish him as a hero in the eyes of the public.

Sarnoff's early experiences in the telecommunications industry set the stage for his later success in radio and television. He learned the technical skills necessary to work with wireless technology and developed an understanding of how communication networks functioned. These skills and knowledge would prove invaluable as he rose through the ranks at RCA and helped to shape the future of the industry.

David Sarnoff began his career with the Radio Corporation of America (RCA) in 1919, shortly after it was formed to take over the assets of the Marconi Company. Sarnoff was appointed as RCA's general manager, a position he would hold for many years.

Under Sarnoff's leadership, RCA became a dominant force in the radio industry. He oversaw the development of the first radio network in the United States, the National Broadcasting Company (NBC), which was formed in 1926. NBC grew rapidly, broadcasting news, sports, and entertainment programs to millions of Americans. Sarnoff also helped to establish the American Broadcasting Company (ABC) and the Columbia Broadcasting System (CBS), which would become major players in the radio industry.

Sarnoff was a visionary leader who recognized the potential of radio to bring people together and to disseminate information and entertainment. He played a key role in the development of radio technology, overseeing the creation of new equipment and innovations that improved the quality and reliability of radio broadcasting.

Sarnoff was also a skilled marketer, using his charisma and public speaking ability to promote RCA and the radio industry. He believed that radio had the power to shape public opinion and influence culture, and he used his position to advance the industry's interests in government and society.

During World War II, David Sarnoff played an important role as a consultant to the U.S. government. In 1940, he was appointed as the chairman of the National Defense Research Committee's Subcommittee on Communications, which was tasked with developing new communication technologies for the military.

Sarnoff worked closely with government officials and military leaders to develop new communication technologies, including radar and sonar systems, which helped to give the Allies a significant advantage in the war. He also worked on the development of the first airborne radar system, which allowed planes to detect enemy ships and submarines from long distances.

In addition to his work on communication technology, Sarnoff was also involved in the war effort as a civilian leader. He was a member of the War Production Board and the National War Fund, and he helped to coordinate the production of war materials and raise funds for the war effort.

After the war, Sarnoff continued to be involved in government work. He served on the National Security Resources Board and was appointed by President Harry Truman as the U.S. representative to the United Nations Atomic Energy Commission. He also continued to lead RCA and played a key role in the development of new communication technologies, including color television and the first communications satellite, Telstar.

Overall, David Sarnoff's contributions during World War II helped to shape the course of the war and had a lasting impact on communication technology. His work in government and industry helped to advance American interests and laid the groundwork for the modern world of communication and technology.

Sir Charles Wheatstone - RF CafeSir Charles Wheatstone

Sir Charles Wheatstone was an English physicist and inventor who is best known for his work in the field of telegraphy and his invention of the Wheatstone bridge circuit. He was born on February 6, 1802, in Gloucester, England, and died on October 19, 1875, in Paris, France.

Wheatstone was educated at King's College, London, where he studied music and mathematics. In the 1820s, he began conducting experiments on the properties of sound and developed a method for measuring the pitch of musical tones using a rotating disk and a series of tuning forks.

In 1837, Wheatstone and William Fothergill Cooke developed the first commercial electric telegraph, which used a system of wires and electromagnets to transmit messages over long distances. The telegraph revolutionized communication and paved the way for the development of modern telecommunications.

Wheatstone also made important contributions to the study of electricity and magnetism. In 1843, he invented the Wheatstone bridge circuit, which he used to measure the resistance of various materials. The circuit consists of four resistors arranged in a diamond shape, with a voltage source connected across one diagonal and a galvanometer connected across the other diagonal. By adjusting the resistance of one of the known resistors, the unknown resistance can be determined.

In addition to his scientific work, Wheatstone was also a skilled musician and inventor of musical instruments. He invented the concertina, a type of small accordion, and developed a method for recording and reproducing sound using a device called the "phonautograph."

Wheatstone was awarded numerous honors for his contributions to science and engineering, including a knighthood in 1868. His legacy as a pioneer in the field of telecommunications and electrical instrumentation continues to be felt to this day.

Innovative Power Products Passive RF Products - RF Cafe
RF Electronics Shapes, Stencils for Office, Visio by RF Cafe
Rigol DSG5000 Microwave Generator - RF Cafe
TotalTemp Technologies (Thermal Platforms) - RF Cafe

Please Support RF Cafe by purchasing my  ridiculously low−priced products, all of which I created.

These Are Available for Free


About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024


    Kirt Blattenberger,


RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website: