Jump to content

File:Heliogen medium wave galena radio.JPG

Page contents not supported in other languages.
This is a file from the Wikimedia Commons
From Wikipedia, the free encyclopedia

Original file (1,596 × 1,992 pixels, file size: 831 KB, MIME type: image/jpeg)

Description
English: A medium wave crystal radio receiver, manufactured by Heliogen in Germany, 1935. The coil of wire (left) is the tuning coil. It can be unplugged and replaced with different coils to cover different radio bands. It is wound in a "basket-weave" pattern to reduce resistance at radio frequencies. In front of it in the glass tube is the cat's whisker detector, consisting of a crystal of galena touched by a fine wire, which extracts the audio signal from the radio frequency carrier wave. In front of that is the tuning knob, connected to an adjustable capacitor which is used to tune in different stations.
Français : Poste a cristal
Date
Source Self-photographed
Author Badseed
Permission
(Reusing this file)
I, the copyright holder of this work, hereby publish it under the following licenses:
GNU head 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.
w:en:Creative Commons
attribution share alike
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported 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.
Annotations
InfoField
This image is annotated: View the annotations at Commons

Captions

Add a one-line explanation of what this file represents

Items portrayed in this file

depicts

February 2009

0.1 second

40 millimetre

image/jpeg

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current01:40, 20 February 2009Thumbnail for version as of 01:40, 20 February 20091,596 × 1,992 (831 KB)Badseed{{Information |Description=A Heliogen galena medium wave radio receiver. Made in Germany, 1935. |Source=Own photo |Date=February 2009 |Author=Badseed |Permission={{self|GFDL|cc-by-sa-3.0}} |other_versions= }} [[Category:An

The following 2 pages use this file:

Global file usage

Metadata