All-Weather Telephone Catalogue
No. T110
The requirement for a weatherproof automatic
instrument is satisfied by this telephone. Following closely the technical
performance of the 1746 series (Cat. No. T101) the all-weather telephone is
for use on automatic exchange systems. High quality transmission performance
and optimum working over 1000 ohm subscribers lines is combined with a
robust and compact design.
The case and door are cast in corrosion - resistant aluminium alloy which
combines lightness with strength.
Wall mounting is effected by mounting the base plate and terminating
external wiring before the body is attached.
The door incorporates a raised silhouette of a handset and it is retained
by a plunger-controlled lock which has a simple release mechanism. A
neoprene rubber gasket fitted to a recess ensures exclusion of moisture and
dust when the door is closed.
The finish of both the interior and exterior is hammer finish light grey
stoved enamel.
Dimensions/Weight (unpacked)
Height - 310mm
Width - 146mm
Depth - 168mm
Weight - 4.8kg
Pye TMC Stock Number 538844.
Technical Data
Construction
Cast aluminium alloy. Body webbed to form an internal shelf which houses the
dial and handset when the body is mounted to the base it compresses a
neoprene strip which effects a weatherproof joint.
A door of cast aluminium, with a raised silhouette of a handset, is fixed
to the body with brass hinges and is sealed with a neoprene strip when
closed.
Cable entry
2 brass bushes are attached to the bottom of the base; these are threaded to
take un conduit or watertight packing gland.
Handset
The handset is fitted with a temperature-resistant coiled cord, and is
moulded in ABS. It is held in position by a stainless steel 'rest' at the
receiver end and a phosphor bronze clip at the bottom.
Cradle switch
Sealed microswitch.
Ringer
The ringer is a double coil type with 1,000 ohm d.c. resistance. It will
accept ringing currents between 16 and 30hz. Stainless steel (101 mm dia.) gongs are mounted on the
underside of the base so that ringing is clearly heard.
Dial
Articulated-trigger type with self-compensating action. Projects through
self-centreing ring on case. Characters printed black on silver background
beneath stainless steel finger plate.
Speed - 10 pps nominal.
Interdigit pause - 240 mS minimum
Break-to-make ratio - 2: 1.
Transmitter
Carbon granule replaceable capsule type. The change in sensitivity
over the input range 3-30 dynes per sq, cm. is less than 5db at a given
frequency in the range 300-3,400Hz. Reciever
Rocking armature, replaceable capsule type. The receiver has a mean
sensitivity of +46 ±2dB relative to 1 dyne per sq. cm. per VmW of available
power when tested with an artificial ear.
Taken from Publicity Leaflet A.A.8.74.3M (dated 1974) |