History of radio technology

Galena, also called lead glance, is the natural mineral form of lead(II) sulfide (PbS). It is the most important ore of lead and an important source of silver.

Irish physicist (1851–1901)

simple radio receiver circuit used mostly for AM reception

world day

British physicist (1851-1940)

working life museum in Varberg Municipality, Sweden

electric circuit consisting of an inductor and a capacitor

method of communication

common type of radio receiver that shifts the received signal to an easily-processed intermediate frequency

radio receiver that uses semiconductor active elements

right|thumb|Metal filings coherer designed by Guglielmo Marconi, consisting of a tube containing two electrodes spaced a small distance apart, with metal filings in the space between them The coherer was a primitive form of radio signal detector used in the first radio receivers during the wireless telegraphy era at the beginning of the 20th century. Its use in radio was based on the 1890 findings of French physicist Édouard Branly and adapted by other physicists and inventors over the next ten years. The device consists of a tube or capsule containing two electrodes spaced a small distance a

former company

device

national holiday in Russia on 7 May

early radio receiver component

first commercially manufactured transistor radio

Radio receiver with amplifier stages and a detector

electromechanical generator of high-frequency, high-power current for radio transmitters

headland on the Isle of Wight, in England, UK

aspect of history relating to the invention of radio

radio receiver design in which the same amplifier is used to amplify radio frequencies and audio signal

French physicist and engineer (1892-1965)

variety of spark transmitter

physicist, mathematician, inventor (1853-1922)

laboratory, historic site, historic building in Nizhny Novgorod, Russia