File:Radio receiver 06.jpg
Jump to navigation
Jump to search
Size of this preview: 799 × 599 pixels. Other resolutions: 320 × 240 pixels | 640 × 480 pixels | 1,024 × 768 pixels | 1,293 × 970 pixels.
Original file (1,293 × 970 pixels, file size: 590 KB, MIME type: image/jpeg)
 |
This is a file from the Wikimedia Commons |
| Description |
English: French 4 valve regenerative radio receiver from 1919. Invented in 1913 by Edwin Armstrong, the regenerative receiver was widely used until it was superseded in the 1930s by the superheterodyne receiver. This one uses 4 valves; a regenerative detector, followed by 3 audio amplifiers to provide enough power to drive the horn loudspeaker. It uses the Armstrong or "tickler" circuit, in which the signal from the plate circuit of the detector tube is fed back into the grid circuit by magnetically coupled coils, to increase the gain and selectivity. This is accomplished by the dual "honeycomb coil" vario-coupler (left). One coil is the tuned circuit of the receiver, connected to the grid. The other is the "tickler" coil in the plate circuit. The coils are hinged so they can be moved together or apart to change the coupling, which controls the amount of feedback. |
| Date | 1 October 2006, 15:39:21 (according to Exif data) |
| Source | Own work |
| Author | Iron Bishop |
| Permission (Reusing this file) |
Own work, copyleft: Multi-license with GFDL and Creative Commons CC-BY-SA-2.5 and older versions (2.0 and 1.0) |
I, the copyright holder of this work, hereby publish it under the following licenses:
|
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License. |
  
|
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. | |
| ||
| This licensing tag was added to this file as part of the GFDL licensing update. |
This file is licensed under the Creative Commons Attribution-Share Alike 2.5 Generic, 2.0 Generic and 1.0 Generic license.
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
You may select the license of your choice.
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 19:45, 21 August 2011 | | 1,293 × 970 (590 KB) | Adrignola | Crop |
| 19:48, 10 January 2007 |  | 1,600 × 1,200 (748 KB) | Iron Bishop | {{Information |Description=*{{it|ricevitore a plato a quattro valvole}} *''year'': 1919 *''note'': made in France |Source=Own work |Date=''see exif'' |Author=User:Iron Bishop |Permission=Own work, copyleft: Multi-license with GFDL and Creative Common |
File usage
The following page uses this file:
Global file usage
The following other wikis use this file:
- Usage on it.wikipedia.org
