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     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 coupler

Simple crystal radio using loose coupler


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
Murdock Loose Coupler, 1913

Murdock Loose Coupler
Murdock Loose Coupler, 1914

Arlington Receiving Transformer
Arlington Receiving Transformer, 1915

Navy type Loose Coupler
Navy type Loose Coupler, 1917

Unidentified Loose Coupler
Unidentified Loose Coupler, c.1916

Adams Morgan #520
Adams Morgan #520, 1920

Clapp Eastham Slide Coil Tuner
Clapp Eastham Slide Coil Tuner, 1912

Unidentified Loose Coupler
Unidentified Loose Coupler, c.1916

Tel-Radion Loose Coupler
Tel-Radion Loose Coupler, c.1912

William B. Duck Loose Coupler
William B. Duck Loose Coupler, 1916

The Radio Apparatus Co

The Radio Apparatus Co, 1916

J.F.Arnold Loose Navy type Coupler
J.F.Arnold Loose Navy type Coupler, New York, 1916

JH Bunnell Jove Radio Loose Coupler
JH Bunnell Jove Radio Loose Coupler, c.1917

Signal Minominee Type R-2, Michigan, c.1918
Signal Minominee Type R-2, Michigan, c.1918

Sears loose coupler

Sears loose coupler

SIgnal Loose Coupler
SIgnal Loose Coupler







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