File:Homemade radio receiver with razorblade.JPG
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Original file (2,340 × 1,656 pixels, file size: 1.16 MB, MIME type: image/jpeg)
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DescriptionHomemade radio receiver with razorblade.JPG |
English: A homemade "crystal" radio receiver, made in Greece, 1935. This example uses a razor blade and battery carbon to make a crude point-contact diode, instead of the galena cat's whisker detector used in most crystal radios. Receivers using this technique that were constructed by soldiers during World War 2 were also known as "foxhole radios". The battery included in this radio does not provide power to amplify the signal as in modern radios, but is used to apply a small bias voltage to the razor blade detector, to make it more sensitive. Français : Un récepteur radio a cristal fait maison, se servant d'une lame de rasoir comme détecteur. Fabriqué en Grèce. Des récepteurs employant cette technique ont été construits pendant la guerre ont été également connus en tant que "foxhole radio". |
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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 |
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2340
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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 | 02:15, 20 February 2009 | 2,340 × 1,656 (1.16 MB) | Badseed (talk | contribs) | {{Information |Description=A homemade radio receiver, making use of a razorblade instead of galena to create a point diode. Made in Greece, 19350. |Source=Own photo |Date=February 2009 |Author=Badseed |Permission={{self|GF |
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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 | 1/30 sec (0.033333333333333) |
F-number | f/4.2 |
ISO speed rating | 1,600 |
Date and time of data generation | 16:02, 7 February 2009 |
Lens focal length | 30 mm |
Orientation | Normal |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | GIMP 2.6.1 |
File change date and time | 20:14, 10 February 2009 |
Y and C positioning | Co-sited |
Exposure Program | Shutter priority |
Exif version | 2.21 |
Date and time of digitizing | 16:02, 7 February 2009 |
Image compression mode | 4 |
APEX exposure bias | 0 |
Maximum land aperture | 4.1 APEX (f/4.14) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire |
DateTime subseconds | 70 |
DateTimeOriginal subseconds | 70 |
DateTimeDigitized subseconds | 70 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 45 mm |
Scene capture type | Standard |
Contrast | Normal |
Saturation | Low saturation |
Sharpness | Hard |
Subject distance range | Unknown |