Operating Instructions
OP1920102 REV 1 02/26/01
DTC Communications, Inc. Page 2 of 9
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 T-
2050 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
e
² Lithium
AA battery installed. A fresh battery will operate the unit for over two hours. The T-
2050 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.