ERICSSON
TELEPHONE No's N1844 & N1845
 

This compact telephone is made to withstand the arduous conditions of service in the field as a linesman's testing set or temporary station. The strong, light steel casing is partly pressed up and partly fabricated by welding, rust proofed and coated with a hard baking stove enamel.

Adequate protection of the vital parts is ensured, both during transport and when the set is open for use. The woven fabric adjustable strap is attached by swivel links and has loops for carrying an earth spike.

P.V.C. insulated wire is used for the internal connections.

The equipment includes a moulded handset with press key, anti-side-tone induction coil, capacitors, alnico generator of about 3 watts output, 2000 ohm ringer and, in a neoprene-lined compartment seen at the back centre in the illustration, two dry cells (inert cells are supplied for the tropics). An adapter is available for insertion in the battery compartment to enable two standard cylindrical 1.5 volt torch batteries, 13in. diameter to be used, instead of the rectangular type N3774 (N3775 inert) normally provided. Orders should specify type of battery required.

The generator handle is stowed vertically for transport, and turned down for use, being held in either position by a spring-loaded slide on the crank.

These were made obsolete in 1971.

AUTO, CB OR MAGNETO

This robust portable telephone has been primarily designed for use as a linesman's testing set but can also be employed as a temporary station. Three versions of the telephone are available for connection to:-
1. Automatic, C.B. and magneto systems
2. Magneto systems
3. C.B. or Magneto systems

Main Design Features
Latest anti-side tone circuit as used in BPO instruments.
Components specially finished to withstand tropical conditions.
Powered by two small batteries.
PVC insulated wiring used throughout.

Case
This is made from pressed steel, with a dark-brown, stove-enamelled finish.  All joints are welded to provide utmost protection from knocks and abrasions for the instrument it accommodates.

The dial, handset, alnico generator, 2000 ohm ringer mechanism, anti-side tone induction coil, capacitors for receiver and bell circuits, two batteries, a plunger key and terminal block are all contained within the case.

Swivel-link fasteners retain an adjustable, woven-fabric, shoulder strap provided with loops for carrying an earth spike when required.

Dial
The dial, additionally protected by a hinged lid within the case, has  standard numbering, a 2:1 break-to-make pulse ratio, a speed of 10 p/s and a stainless-steel fingerplate.

Handset
This is of black moulded-plastic construction and incorporates a press switch in the handle for on/off transmit control.

Plunger Key
For automatic and C.B. working this key is pulled up for dialling and speaking, and pushed down to clear.
For magneto working the plunger key is pushed down for ringing and speaking.

Power Supply
This is provided by two 1.5V torch batteries (customer supplied) accommodated in a neoprene-lined compartment in the case.

Dimensions
Height: 5.5in (139.7 mm).
Width: 11in (282.6mm).
Depth: 5in (127mm).

Equipment

The N1844A (Services Type J) is a special light weight waterproof  telephone with terminals for extra receiver is available for CB and Magneto working.

The N1845 was introduced 1946 and made obsolete in 1971.

Taken from the Plessey Telephone Catalogue (1971)

Additional Pictures
N1845F9T
As supplied to Rediffusion Ltd.

Last revised: April 29, 2025