TELEPHONE No. 9701

The Tremolo Telephone (Telephone No. 9701) is a press button 10 pps signalling telephone intended for the residential market and others the following facilities:-

Made by Northern Telecom and BTCE Cwmcarn (Manufacturers code FWG)

Sale terms only from lst April 1988

APPROVAL STATUS
approval number S/1000/3/F/500162

Teles 9701 have a Ringer Equivalence Number (REN) of 1.

A plastic peg is supplied with the telephone, this should be fitted to the gravity switch plunger to prevent the handset from falling off the cradle when the instrument is wall-mounted. The peg is fitted by pushing the two prongs into the holes in the plunger and snapping off the excess lug. The line cord may be re-routed along the retaining channels on the base of the instrument alongside the handset cord if required. A 300mm line cord is also available for wall mounted use.

Line and handset cords are plug ended and may be removed by pressing down the retaining clip on the plug with a pointed implement and gently pulling the cord.

PARTS

DESCRIPTION                                      BT ITEM CODE
Telephone 9701 Red                               877120
Telephone 9701 Black                             877121
Telephone 9701 Almond                            877115
Telephone 9701 Blue                              877116
Telephone 9701 Biscuit                           877117
Cord Conn. 4/530 300mm, Silver Satin             429696
(Short cord for wall mounted use)
Cord Conn. 4/531 267mm Almond                    429754
Cord Conn. 4/531 267mm Blue                      429755
Cord Conn. 4/531 267mm Biscuit                   429756
Tremolo Holder Label 1A                          429757
Cord Conn. 4/530,3000mm Silver Satin             429758
Kit 864A (Wall Mounting Kit - includes, gravity switch peg)   429759


TESTING
Idle - Normal Capacitor Loop test conditions via the master socket and tone caller circuit.
The Tele 9701 draws typically 12 ma line current whilst on-hook to retain last number re-dial memory, this may result in low resistance loop line test-conditions.
Seized - Normal off-hook press button telephone loop. The electronic keypad and transmission circuitry may give high resistance tele-loop line test conditions as with other press button telephones.

ADDITIONAL INFORMATION
Telephones 9701 receiver insets are designed to provide an inductive coupling effect to benefit users of 'inductive coupler' behind the ear type hearing aids.
Early version Teles 9701 (Item coded 870176, 870177, 870163) were withdrawn from new supply during August 1986 for rework to overcome magnetic problems with the handset.
Later versions (Item coded 877115, 877116, 877117) were withdrawn from new supply during January 1987 for modification to prevent cords from being unplugged from the telephone without the use of a tool.
Models that have been modified to overcome this later problem are marked with a yellow spot on the box and instrument base for identification, models produced during 1987 will incorporate modified cords on production Modified and new models will continue with the existing Item Code numbers.
Tremolo telephones manufactured by Northern Telecom prior to 1986 week 32 have good RF1 immunity from 100kHz to 10 Mhz but poor immunity to higher frequencies. Those manufactured since 1986 week 32 have fairly good RFI immunity from 100kHz to 150Mhz and may be identified by the year and week marking (i.e. first digits of the eleven digit serial number) on the base of the telephone.
All Tremolo telephones manufactured by BTCE Cwmcarn have fairly good RFI immunity from 100kHz to 150Mhz.
Telephones 9701 manufactured before week 43 of 1986 may cause 'repeated digits' to be pulsed out when making outgoing calls, resulting in `wrong number complaints'. Models made after this date should not be affected. There will be no dual signalling or MF4 signalling versions of Tremolo.

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Last revised: October 30, 2003

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