Wall mounting telephone
The GEC711 telephone is the wall-mounting counterpart of the GEC706 table model and has the same high performance and proven reliability.
Many of the components used in the GEC711 are the same as those in the table instrument ; the basic difference is in the shape of the case. Internally, the only differences are the cradle switch and the cradle-switch/dial support bracket - both changed to accommodate the restyled, slimmer case.
The GEC711 can be mounted on wall, pillar or stanchion and is of particular use in locations such as corridors, where space is at a premium.
All the facilities offered for the GEC706 are available for the GEC711 - shared service, automatic, C.B. manual working etc. Provision is made to mount up to four keys, two lamps and a d.c. buzzer in the telephone case to give extra facilities, such as those of the GEC710 secretarial switching-telephone system.
The case is moulded in a scratch-resistant temperature-stabilized plastic that is easily cleaned and withstands rigorous use in climatic extremes. The simple lines minimize dust collection. Special attention has been given to ensure that the handset will always return to its correct rest position however carelessly replaced.
The handset, moulded in the same material as the case, is light in weight and combines a high degree of user comfort with maximum transmitter efficiency. Its shape ensures that, with the receiver held to the ear normally, the transmitter is located in the most efficient position.
The carbon-granule transmitter and the rocking-armature receiver provide clear speech reproduction with low distortion over a wide speech-frequency range.
The handset cord is coiled for compactness and p.v.c. sheathed, affording protection to the conductors against wear and condensation. The cord ends are firmly secured so that the terminations are not subject to stress. The colour of the cord matches that of the handset. The handset cord lead-out point is centred at the telephone base to
allow left or right-handed operation.
An off-hook position is provided so that the handset may be parked while the user is referring to documents, for example, in answer to a caller's query. The handset hangs at the side of the telephone case and is protected against accidental knocks from passers by.
The G.E.C. articulated-trigger dial is used which has a self-compensating action that shows no appreciable variation in pulse ratio after 4z million impulses. The dial projects through a self-centring number ring on the case. A wide range of number rings is available, in various languages, to suit the needs of individual Administrations. The finger plate is made of clear plastic.
The cradle switch design eliminates any likelihood of sticking plungers. A plastic cover is fitted over the spring contacts to prevent accumulation of dust of the contacts.
An automatic regulator is fitted. It is required principally on short lines when the sensitivity of the instrument is such that normal speech reproduction may be uncomfortable to the ear.
The regulator is a plug-in unit and if not required it can be rendered inoperative by simply inverting it in its socket.
The double-coil ringer has a pleasant and purposeful sound and will operate from all normal exchange ringing supplies. A bell volume control can be fitted if required. An extension bell, BE1100 or BE1201 series, can be supplied to provide a calling signal at a distant point from the telephone, or augment calling signals in noisy surroundings.
Special insulation is included so that the telephone can be used in any climate. The design provides both adequate ventilation against humidity and protection against the ingress of insects
The telephone protrudes only 11 cm (48 in) from the wall and is secured to the wall by a simple bracket as shown in the accompanying sketch. The line wires enter by a small aperture in the baseplate.
Case and handset moulded in A.B.S. high-impact plastic. Three colours available: black, dual grey, ivory.
PVC-covered, cadmium-tinsel-conductor coiled cord, colour to match handset. Held in position by grommets which relieve conductors of any stresses.
Length: 25 cm (10 in) unextended; 170 cm (68 in) extended.
Speed: 10 p.p.s.
Break-to-make ratio: 2 to 1 other ratios can be supplied. For C.B. working, a dial-dummy disc replaces the dial.
Rocking armature, replaceable capsule. Sensitivity: +46 db relative to I dyne/cm2/root mW available power.
Carbon granule, replaceable capsule. Sensitivity +30 db relative to 1 mV/dyne/cm2 at 20 dynes/cm2 input.
An automatic volume regulator is fitted to limit speech-signal amplitudes on lines shorter than 400 ohms; introduces virtually no attenuation on longer lines.
Double-coil, d.c. resistance 1000 ohms;
Impedance 2000 1 at 25 c/s, 20 k at 1000 c/s. Accepts ringing currents of between 16 and 30 c/s.
Bells, double gong, harmonizing tones.
Suitable for use in all climates. Protected against entry of insects.
Dimensions and Weight
Height: 230 mm (9 in)
Width: 154 mm (10 in) over handset 145 mm (5.75 in) over case depth
Depth:10 mm (4.3 in)
Weight of telephone:1.7 kg (3.75 lb)
Handset weight: 280 gm (10 oz)
Taken from the GEC Catalogue Leaflet STL18B (1966)
See also TEL2W
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Last revised: 20 October, 2008