DTC Communications T2050 Surveillance Transmitter for Law Enforcement User Manual T2050 Users

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Document ID	138067
Application ID	5tW0SiuTpq5auRNZS1T6Og==
Document Description	T2050 Users
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Microsoft Word - pdf
Filesize	9.13kB (114177 bits)
Date Submitted	2001-02-24 00:00:00
Date Available	2001-05-14 00:00:00
Creation Date	2001-02-26 06:41:51
Producing Software	Acrobat Distiller 4.0 for Windows
Document Lastmod	2001-02-26 06:41:53
Document Title	T2050 Users

DOCUMENT NUMBER: OP1920102 REV. 2
DESCRIPTION: T-2050 OPERATING INSTRUCTIONS
ECO NUMBER:_______
Page____of________
Date:_____________
Orig:_____________
SIGN OFF
DATE:
mm/dd/yy
Proj Eng._________________
Mfg Mgr. _________________
Documentation ____________
Eng. Mgr._________________
Purchasing _______________
OP1920102 REV 1
02/26/01
DTC COMMUNICATIONS, INC.
Operating Instructions for the T-2050 Pager
Disguise Transmitter
DTC Communications, Inc.
Page 1 of 9
OP1920102 REV 1
02/26/01
Introduction
The T-2050 is a 200mW audio surveillance transmitter installed in a Motorola FLEX™
pager housing. This narrowband compliant device is synthesized and supports advanced
features and has as 4-channel capability. Channel selection is made by the user during
power-up, via the reset button. The channel selection is stored in non-volatile memory.
The pager is also equipped with a vibrator, which is used to communicate to the operator,
the channel selection, power-up and power-down and a low battery condition. The T2050 also sends short tones over the air for power up and power down notification and
sends a tone once a minute for a low battery warning.
Default factory programming is for the transmitter to transmit immediately upon insertion
of the AA battery, on the same channel that was last selected. Factory programming
provides for various options such as User Turn ON, User Turn OFF, and User Low
Battery Indicate.
The transmission is a narrow-band FM signal, of 2.5 kHz deviation, which is compliant
to NTIA analog transmission mode. The antenna is an internal loop antenna, tuned to a
specific 2 MHz operating range. The audio circuitry is built around a Gennum automatic
gain control (AGC) circuit, and an internal high-quality Knowles microphone. Output
power does not change over the T-2050’s operational battery life, due to a step-up
switching power supply circuit. The efficient switching power supply converts the 1.5
volts from the Eveready L91 Lithium battery to 5 volts for operating the transmitter.
Battery life is over two hours at a constant 200mW.
The pager display and controls operate normally, contributing to the covert packaging.
The pager will also go through the normal paging beep sequence on power up. The
T-2050, however, does not receive paging messages.
Description
Battery
The T-2050 will operate correctly ONLY with an Eveready model L91 or e² Lithium
AA battery installed. A fresh battery will operate the unit for over two hours. The T2050 will operate for less than 15 minutes with a standard alkaline battery installed.
To install the battery, hold the pager face down and proceed as follows:
1) Unlock the battery door by sliding the door latch away from the battery door.
2) Slide the battery door in the direction of the arrow (toward the outer edge).
3) Lift the battery door away from the housing to remove it.
DTC Communications, Inc.
Page 2 of 9
OP1920102 REV 1
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4) Place the battery into the battery compartment, taking note of the positive (+) and
negative (-) markings on the battery and the pager housing.
5) Replace the battery door and lock by sliding the door latch toward the battery door.
NOTE: As soon as the battery is inserted, the pager will sound the normal Motorola
FLEX™ pager power up alert.
In the factory default program mode, the transmitter is powered up from the moment
the battery is inserted into the unit on the last selected channel. There is no power
switch in the factory default program mode.
Audio Circuit
The audio circuit is based on a Gennum automatic gain control (AGC) microcircuit and
an internal, high-sensitivity Knowles electret microphone. When the pager is placed in
the holder and worn on the body, the microphone is located behind a small hole on the
side of the pager facing up. Excellent audio quality will be achieved if this hole is kept
clear of fingers and clothing.
All body-worn transmitters are susceptible to “clothing noise”. The standard Motorola
pager holder that comes with the T-2050 tends to keep the microphone away from the
body and clothing, reducing the tendency to generate clothing noise.
Flex™ Pager Features
The Flex™ pager has several features that remain fully functional and assist in the pager
disguise.
One useful feature is the clock display of the pager. Feel free to set the time and date on
the display. The Flex™ pager instruction manual will describes how to set the internal
clock. If not set to the correct time of day, the clock will act as a timer indicating the time
elapsed since turn on. This may help in assessing battery life remaining however the
pager clock may continue to operate even though the transmitter circuitry has shut down
due to a low battery condition.
You may use the built in alarm clock feature of the pager. As you navigate through the
function menu you will find a “Set Alarm” function. This can be used to simulate a page
being received at a certain time. When the alarm is set, a “bell” symbol is visible in the
lower left corner of the screen.
The regular Flex™ pager beeper is still active in the unit. By scrolling through the
pager’s menus, the user can set the alert type (i.e. the sound of the beeps) for the pager,
and cause the beeper to activate. This may be useful to show that the pager is “real”. In
the T-2050, the vibrator is not controlled by the Flex™ pager circuitry and therefore will
not activate as in a normal Flex™ pager. The vibrator in the T-2050 is used to provide
feedback to the operator during channel setting and other functions and is controlled by
the T-2050 circuitry.
DTC Communications, Inc.
Page 3 of 9
OP1920102 REV 1
02/26/01
One of the Flex™ pager functions is “Turn Pager Off/On”. This is purely a Flex™ pager
function and refers only to the Flex™ pager circuitry. The Flex™ pager “Turn Pager
Off/On function will have NO EFFECT on operation of the T-2050 transmitter.
Operation
1. Place the holder on a belt and load a Lithium AA battery into the pager. The pager
will power-up and beep, showing the date, time in the display. After about 10
seconds the display will blank and only show the “power-on” symbol and the speaker
symbol.
2. Pressing any button will re-activate the display. You may access the menus per the
Flex™ pager instructions, if you wish. NONE OF THE BUTTONS OR RELATED
FUNCTIONS WILL HAVE ANY EFFECT ON THE TRANSMITTER
WHATSOEVER IN THE FACTORY DEFAULT PROGRAM MODE.
3. Slide the unit into the belt holder. The T-2050 is now operating.
4. Remove the battery when not in use. The unit will transmit when an operating battery
is in place; there is no on/off switch in the default program mode. IT IS
IMPERATIVE TO DISCARD partially used batteries, as their remaining life is not
very predictable. ALWAYS start an operation with a fresh battery.
Unique T-2050 Features
Default Features – These features are enabled at the factory:
•
•
•
•
•
•
1.
Immediate TX-ON when battery is inserted
Active display
Active Beeper
Active clock
Low battery tone burst (triple beep) transmission every 60 seconds
User Channel Selection
Channel selection is made by holding the main pager reset button (large oval button,
black with a green stripe) while inserting the battery (the selection of up to 4 preprogrammed channels are available).
2. If the button is held when the battery is inserted, the vibrator immediately emits a
series of pulses representing the number of the channel that was last used.
3. If the button is released within three seconds of the last pulse, the unit selects the
same channel that was last used (i.e. no change).
4. If the button is held for more than three seconds, another series of pulses are emitted
representing the next available channel. For example, if the first series of pulses
consisted of two pulses (representing channel 2), then the next series will consist of 3
pulses.
DTC Communications, Inc.
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OP1920102 REV 1
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5. If the button is released within 3 seconds, the device will select the new channel.
6. The series of pulses will continually increment and repeat as long as the button is held
down (1, 2, 3, 4, 1, 2… etc.) . The highest number of channels is 4.
DTC Communications, Inc.
Page 5 of 9

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