Spark Gap Transmitter Circuits

Spark-gap transmitter circuit from Guglielmo Marconi's controversial patent no. 763772 for a "four circuit" wireless telegraphy radio communication system. The significant innovation of this circuit was the u More

Drawing from radio pioneer Guglielmo Marconi's 1896 US patent no. 586193, TRANSMITTING ELECTRICAL SIGNALS, showing his invention of the monopole antenna. Marconi invented the first practical radio transmitter More

American engineer John Stone Stone's radiotelegraphy communication system, from his 1900 patent. On the left is the spark gap transmitter, which transmits pulses of radio waves when the telegraph key (k) is p More

Français : Émetteur à bobine de Ruhmkorff (utilisé jusqu'à 1905. English: Spark-gap radio transmitter circuit using induction (Ruhmkorff) coil (used around 1905)

Transmitter for wireless telegraphy: (I) induction coil; (G) spark gap; (K) battery key; (A) vertical wire; (E) ground.

Русский: Иллюстрация к статье Электрические колебания из энциклопедии Брокгауза и Ефрона English: A Hertzian spark-gap transmitter, the earliest type of radio transmitter. Used by Heinrich Hertz in his hist More

Русский: Иллюстрация к статье Электрические колебания из энциклопедии Брокгауза и Ефрона English: Illustration of a Lecher line, an experimental method of measuring the wavelength of radio waves developed by More

Two circuit schematics from British physicist Oliver Lodge's 10 May 1897 patent, showing his "syntonic" wireless telegraphy radio transmitter (bottom) and receiver (top). This patent was important because it w More

Circuit of Guglielmo Marconi's spark gap radio transmitter built at Poldhu, UK, the world's first powerful radio transmitter, with which he achieved the first transatlantic radio transmission 12 December 1901. More

In this diagram A is the transmitting instrument and B is the receiving instrument, placed at say ¼ mile apart. In the transmitting instrument R is an ordinary induction coil (a Ruhmkorff coil or transformer). More

Early wireless transmitter coupling circuits (Rankin Kennedy, Electrical Installations, Vol V, 1903).jpg

spark-gap radio transmitter schematic drawn by me. Français : Émetteur radiotélégraphique à ondes amorties. (Utilisé sur 500 kHz marine).

Français : Émetteur radiotélégraphique à ondes amorties à excitation directe. utilisé en 1901 par Marconi pour effectue la première liaison transatlantique entre Terre-neuve et la Cornouailles English: A cir More

Français : Émetteur radiotélégraphique à ondes amorties utilisé de 1910 à 1960 sur 425 kHz et 500 kHz marine, et en secours utilisé sur 500 kHz jusqu'en 1999 pour la détresse exclusivement SOS. Émetteur à écl More

Français : Émetteur de secours radiotélégraphique à ondes amorties de 1927. Utilisé sur 500 kHz marine English: Circuit of a 1 kilowatt marine spark-gap transmitter. These were the first type of radio transm More

Français : Émetteur à bobine de Ruhmkorff à excitation directe. Guglielmo Marconi expérimente les premières liaisons hertziennes à la Villa Griffone en Italie en télégraphie sans fil à Salvan (Valais) dans le More

Guglielmo Marconi's early wireless telegraphy transmitter (left) and receiver (right) from the 1890s with which he performed the first radio communication experiments. The spark gap transmitter consisted of More

Outline of Hertz's experiment. A: switch; B: transformer; C: metal plates; D: spark gap; E: receiver

The first radio transmitter, the spark oscillator invented by Heinrich Hertz in 1886, with which he demonstrated the existence of radio waves. It consisted of a dipole antenna made of two horizontal wires wit More

Graph of the current in the primary (I1) and secondary (I2) circuit of a quenched-spark inductively coupled spark-gap transmitter, an obsolete type of radio transmitter. This image is meant to contrast with S More

Diagram of a spark-gap transmitter, the first widely used type of radio transmitter, used to send Morse code signals during the "wireless telegraphy" era between 1900 and 1920. This example, from a 1917 boy's More

Diagram of a spark-gap transmitter, the first widely used type of radio transmitter, used to send Morse code signals during the "wireless telegraphy" era between 1900 and 1920. This example, from a 1917 boy's More