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Loose Couplers Crystal Radio |
Also known as a "Receiving Transformer", loose couplers were used extensively
in receivers built during the "teens". The coupler consists of two coils, a
primary and a secondary. The primary coil is stationary and is usually
provided with a slider for varying the inductance by single turns. The
secondary coil slides in and out of the primary to vary the coupling, and is
designed with several switch points in order to change its inductance.
Loose couplers were used as the primary tuning device in early receivers. The
primary coil was attached to an antenna and ground (sometimes through a
variable condenser.) The secondary was connected to a detector (typically a
crystal detector in the early sets).
Simple crystal radio using loose coupler (F.B.Chambers & Co, QST 1916)
Loose couplers were used as the primary tuning device in early receivers.
The primary coil was attached to an antenna and ground (sometimes through a
variable condenser.)
By the early 20's the loose coupler had lost favor as a tuning element to
variometers and variocouplers, with their advantage of smaller size and panel
mounting. Below are some examples of loose couplers:
Murdock Loose Coupler, 1913
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Murdock Loose Coupler, 1914
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Arlington Receiving Transformer, 1915
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Navy type Loose Coupler, 1917
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Unidentified Loose Coupler, c.1916
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Adams Morgan #520, 1920
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Clapp Eastham Slide Coil Tuner, 1912
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Unidentified Loose Coupler, c.1916
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Tel-Radion Loose Coupler, c.1912
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William B. Duck Loose Coupler, 1916
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The Radio Apparatus Co, 1916
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J.F.Arnold Loose Navy type Coupler, New York, 1916
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JH Bunnell Jove Radio Loose Coupler, c.1917
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Signal Minominee Type R-2, Michigan, c.1918
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Sears loose coupler
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SIgnal Loose Coupler
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