File:Antenna loading coil RCA wireless station New Brunswick NJ 1920.jpg
Jump to navigation
Jump to search
Size of this preview: 366 × 599 pixels. Other resolutions: 146 × 240 pixels | 293 × 480 pixels | 928 × 1,520 pixels.
Original file (928 × 1,520 pixels, file size: 233 KB, MIME type: image/jpeg)
Captions
Captions
Antenna loading coil at RCA wireless station, New Brunswick, NJ, 1920
Summary[edit]
| Description |
English: A large antenna loading coil at the New Brunswick, NJ wireless station of RCA (Radio Corporation of America) in January 1920. The station was a longwave transcontinental radiotelegraphy transmitter which transmitted telegram traffic to Europe using a 200 kW Alexanderson alternator radio transmitter. This coil tuned out the capacitance of the huge mile long flattop wire antenna to bring it into resonance with the transmitter to prevent reflections. The two large metal hoops around the top, high voltage end of the coil may be corona rings to prevent corona discharge, an ionization of the air which allows current to leak off the coil into the air, reducing efficiency. Since the electrically short antenna had low radiation resistance, loading coils like this had to have extremely low resistance at radio frequencies, as well as be able to stand the high voltage on the antenna. The cable winding is litz wire, a specialized cable consisting of hundreds of insulated strands of wire braided together. |
| Date | |
| Source | Retrieved January 18, 2014 from The Wireless Age magazine, The Wireless Press, New York, Vol. 7, No. 4, January 1920, p. 9 on http://www.americanradiohistory.com |
| Author | Unknown author |
Licensing[edit]
 |
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.
|
 |
 |
This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.
|
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 12:23, 5 November 2015 | | 928 × 1,520 (233 KB) | Chetvorno (talk | contribs) | User created page with UploadWizard |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
