File:Leyden jars Nauen wireless telegraphy station 1908.jpg
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Summary
DescriptionLeyden jars Nauen wireless telegraphy station 1908.jpg |
English: Spark gap radio transmitter of long distance wireless telegraphy radio station built by Gesellshaft fur Drahtlose Telegraphie (Telefunken) at Nauen, Germany in 1907. Designed by German radio pioneer Georg von Arco, this was Germany's first high power radio station and (using a more powerful transmitter) served as Germany's main communication channel with other nations during World War 1. The bank of narrow Leyden jar capacitors are visible in the background. The 360 jars have a total capacitance of 400 microfarads. The tuning coil (oscillation transformer), a spiral of silver-plated tubing, which with the capacitors make up the tuned circuit, is partially visible between the banks of jars. On the right are the spark gaps that excite oscillations in the tuned circuit. Four are used in parallel, with two held as spares which can be switched into the circuit if one of the four fails. On the extreme right along the floor are two choke coils which protect the high voltage supply transformer (located in another room) from the oscillating radio frequency current in the tuned circuit. The technician is measuring the output frequency with an absorption wavemeter. Since mains power was not yet available the station was powered by an oil engine turning a 35 horsepower (26 kilowatts) alternator. The transmitter's radiated power was about 10 kW in the very low frequency band using a 300 ft. high wire umbrella antenna, and it could be received at a range of about 3,500 kilometres (2,200 miles). |
Date | |
Source | Retrieved December 3, 2014 from C. C. F. Monckton (1908) Radio-Telegraphy, D. Van Nostrand Co., New York, p. 228, fig. 155 on Google Books. Also published in L. Ramakers, "The new wireless station at Nauen Germany" in Scientific American supplement, Munn and Co., New York, Vol. 63, No. 1621, January 26, 1907, p. 25972, fig. 1 |
Author | Unknown authorUnknown author |
Licensing
Public domainPublic domainfalsefalse |
This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
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Annotations InfoField | This image is annotated: View the annotations at Commons |
Leyden jar capacitor bank (360 jars in parallel)
Spark gaps in the tuned circuit which discharge the capacitors through the tuning coil, exciting oscillations in the tuned circuit. 4 are used in parallel to handle the high current, with two backups.
Part of oscillation transformer, consisting of a helix of silver plated copper tubing. This forms the tuned circuit with the capacitors to create the oscillating current.
Chokes (coils of wire) to prevent oscillating current from tuned circuit from getting into high voltage supply transformer (in next room)
Operator measuring the frequency with a wavemeter
Items portrayed in this file
depicts
1908
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 16:14, 3 May 2021 | 1,544 × 1,160 (622 KB) | commons>Materialscientist | FFT |
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