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Magnetic detector
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The magnetic detector or Marconi magnetic detector, sometimes called the "Maggie", was an early radio wave detector used in some of the first radio receivers to receive Morse code messages during the
Marconi's wireless magnetic detector (London)
Marconi's wireless magnetic detector (London)
One of the first prototype magnetic detectors built by Marconi in 1902, in Milan museum. The sensing coils on this instrument are removed.
One of the first prototype magnetic detectors built by Marconi in 1902, in Milan museum. The sensing coils on this instrument are removed.
Recreation of a Marconi ship radio room at the Aalborg Maritime Museum, Aalborg, Denmark. A magnetic detector is on the desk to right of the Marconi t
Recreation of a Marconi ship radio room at the Aalborg Maritime Museum, Aalborg, Denmark. A magnetic detector is on the desk to right of the Marconi tuner receiver, which provided the signal for the magnetic detector.
(A) Antenna wire, (B,B) Iron band around pulleys, (C, C) RF excitation winding on glass tube through which the iron band travels, (D) Audio pickup win
(A) Antenna wire, (B,B) Iron band around pulleys, (C, C) RF excitation winding on glass tube through which the iron band travels, (D) Audio pickup winding, (E) Ground-plate, (S, N) Permanent magnets, (T) Telephone receiver.
Fleming valve
Videos
The Fleming valve, also called the Fleming oscillation valve, is a thermionic valve or vacuum tube invented in 1904 by English physicist John Ambrose Fleming as a detector for early radio receivers us
Magnetic detector
…The Marconi magnetic detector was the "official" detector used by the Marconi Company from 1902 through 1912, when the company began converting to the Fleming valve and Audion-type vacuum tubes. It was used through 1918. See drawing at right. The Marconi version consisted of an endless iron band (B) built up of 70…
The prototype Fleming valves, built October 1904.
The prototype Fleming valves, built October 1904.
Early commercial Fleming valves used in radio receivers, 1919
Early commercial Fleming valves used in radio receivers, 1919
Fleming valve schematic from US Patent 803,684.
Fleming valve schematic from US Patent 803,684.
Valve receiver made by Marconi Co. has two Fleming valves, in case one burns out
Valve receiver made by Marconi Co. has two Fleming valves, in case one burns out