File:Heliogen medium wave galena radio.JPG
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DescriptionHeliogen medium wave galena radio.JPG |
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 |
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Date | |||
Source | Self-photographed | ||
Author | Badseed | ||
Permission (Reusing this file) |
I, the copyright holder of this work, hereby publish it under the following licenses:
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
You may select the license of your choice. |
Annotations InfoField | This image is annotated: View the annotations at Commons |
186
176
532
682
1596
1992
English: Coil with basket winding. German: Korbspulen. Danish: Krydsviklet spole.
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 01:40, 20 February 2009 | 1,596 × 1,992 (831 KB) | Badseed (talk | contribs) | {{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 |
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Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Camera manufacturer | NIKON CORPORATION |
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Camera model | NIKON D40 |
Author | Badseed |
Copyright holder | Licensed under CC-BY-SA and GFDL |
Exposure time | 1/10 sec (0.1) |
F-number | f/5 |
ISO speed rating | 800 |
Date and time of data generation | 15:55, 7 February 2009 |
Lens focal length | 40 mm |
Orientation | Normal |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | GIMP 2.6.1 |
File change date and time | 15:42, 10 February 2009 |
Y and C positioning | Co-sited |
Exposure Program | Manual |
Exif version | 2.21 |
Date and time of digitizing | 15:55, 7 February 2009 |
Image compression mode | 4 |
APEX exposure bias | 0 |
Maximum land aperture | 4.6 APEX (f/4.92) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire |
DateTime subseconds | 10 |
DateTimeOriginal subseconds | 10 |
DateTimeDigitized subseconds | 10 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 60 mm |
Scene capture type | Standard |
Contrast | Normal |
Saturation | Low saturation |
Sharpness | Hard |
Subject distance range | Unknown |