Quickstep
STC's advert for the press-button self-contained Trimphone. The name
'quickstep' was probably used because you could enter the numbers into
the keypad as fast as you liked. The electronics would store the numbers
and pulse them out at 10 p.p.s. to the exchange line which was still
likely to have been served by a Strowger exchange. MF or tone-tone
dialling was to come later.
Ads
Advert from
Post Office Telecommunications Journal Winter 1973/74 |
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"This is the new STC QUICKSTEP DELTAPHONE- it replaces
the rotary dial with push buttons and a memory. And it needs
no battery."
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Even with a specially developed integrated circuit, it was
still a real challenge to cram all of the electronics into
such a small sized case. In fact, early models of the
Quickstep used a slightly deeper case. Earlier press-button
phones (such as the 700 types) needed a battery back-up, or
use of a mains power unit to supply the keypad electronics.
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The STC QUICKSTEP DELTAPHONE is the pushbutton
version of the DELTAPHONE-the highly successful premium
telephone in international use.
It is designed for the British Post Office, and is suitable for
all loop-disconnect signalling systems. It requires no
modifications to the exchange.
It is the first instrument of this type to do away with the need
for an internal battery or a mains power connection. Because of
its attractive new features and appearance, it now offers
telephone administrations throughout the world an immediate
opportunity to earn increased revenue. This is the telephone of
the future.
Speedier operation and a built-in memory.
However quickly the buttons are pressed, the QUICKSTEP
DELTAPHONE'S memory will store the numbers keyed, and will
simultaneously pulse them out at a speed acceptable to the
exchange.
More design features for the user.
The QUICKSTEP DELTAPHONE is elegant, compact and
lightweight-ideal for both residential and business
environments. The pushbuttons are double moulded for permanence
of numerals and the keying surface is slightly depressed to
eliminate finger slippage. The normal ringing tone of a
telephone is replaced with a distinctive 'warble' -the volume of
which can be controlled. There are facilities for operator
recall and shared service, and various signalling arrangements
can be provided between extensions by the addition of an extra
switch, operated by the cradle bar. The cradle bar can be used
as a carrying handle during use. The set is available in three
two-tone colour combinations.
New technical features for the PTT.
The keyblock has a collapse action making keying a definite
movement. This reduces user errors. Reliability and long life
are ensured-the keyblock has been laboratory tested to 200,000
operations per button without failure.
The QUICKSTEP unit is built around an STC-designed
microelectronic integrated circuit containing the equivalent of
1600 transistors. This circuit acts acts as a buffer memory and
controls the timing of the pulses. Power for the unit is drawn
from the line during signalling, no mains or battery power being
required. The uniquely designed handset has an acoustic horn
leading to the transmitter capsule at the earcap end.
The tone caller comprises a transistor oscillator and a
miniature output transducer. The loudness of the output is
controlled by a four-position switch.
QUICKSTEP and DELTAPHONE are registered trademarks of Standard
Telephones and Cables Limited. |
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Technical Details
Transmission
The Quickstep Deltaphone meets British Post Office transmission
performance requirements with no degradation, on lines up to 1000 ohms
loop resistance with an overall electro-acoustical performance
substantially equal to that of the BPO types 706, 746 and Trimphone
telephone sets. It is therfore suitable as a direct replacement for
these telephone sets, or can be used in conjunction with them. Automatic
equalization of the telephone set efficiency for varying lengths of loop
is provided by the transmission regulator which reduces excessive
loudness on short lines without imparing fully efficiency on long lines.
Receiver
Rocking: Armature type REC4041R-BPO No. 3T Frequency Response: flat
within +or - 3 dB from 200 Hz to 3.5 kHz (rising slightly with
frequency). Sensitivity: (at 1 kHz) 45 dB relative to 1 dyne-cm2 per
square root of available power in milliwatts. Standard Impedance: 150
ohms at 1 kHz.
Transmitter
Type TMR4039D; BPO No. 15 The small carbon transmitter and the acoustic
horn system contained within the handset together have an overall
frequency response and sensitivity similar to those of modern
high-quality carbon transmitters for handsets.
Frequency Response: the
efficiency of the horn rises with frequency and this compensates for the
falling response of the transmitter above its resonace.
Sensitivity: (at
1kHz) in free field of 32 dyne-cm2 and at British modal distance from
the artificial mouth-84 dB relative to 1 microvolt open-circuit voltage
per dyne-cm2.
Talking Resistance: 85 ohms at 47 mA feed current.
Colours Available:
Quickstep Deltaphone |
Handset |
Body |
STC Order Code |
Grey |
Heron Grey |
Dove White |
66LAU69AAA |
Blue |
Dolphin Blue |
Ocean Blue |
66LAU69AAB |
Green |
Olive Green |
Quaker Grey |
66LAU69AAC |
Dimensions and weights:
Height overall |
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117 mm (4.6 in) |
Depth, front to back |
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216 mm (8.5 in) |
Width |
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109 mm (4.3 in) |
Handset cord length |
Coiled:
Fully extended: |
254 mm (10 in)
1372 mm (4 ft 6 in) |
Line cord |
Coiled:
Fully extended: |
1372 mm (4ft 6 in)
3050 mm (10 ft) |
Handset weight |
(excluding cord) |
115 g (4oz) |
Telephone set |
(excluding line cord) |
650 g (23 oz) |
Total weight (inclusive of both)
cords and terminal block) |
910 g (32 oz) |
Protected label slot |
61 mm x 15 mm
(2.4 in x 0.59 in) |
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