Heliogen_medium_wave_galena_radio.JPG
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Description Heliogen 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:
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Attribution-Share Alike 3.0 Unported
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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.