DTC Communications LB1 User Manual
LB-1 Beacon Operators Manual
Version 1.0
DTC Communications, Inc.
May 2001
DTC Communications, Inc. Page 1 of 7
FCC RF EXPOSURE STATEMENT
When installed as directed, this equipment complies with the FCC radiation exposure limits as set forth for
both uncontrolled and controlled environments. This equipment produces a finite-time, low- power, lowduty cycle signal that is under the limits for specific absorption rate in any deployment scenario.
FCC TYPE CERTIFICATION
This equipment complies with the FCC Part-90 requirements and has been type certified.
FCC ID: H25LB1
Introduction
The LB-1 Letter Beacon is a micropower, credit card sized transmitter that operates in the VHF band (150174 MHz). It is used for event monitoring and package tracking purposes by law enforcement agencies.
The beacon emits short-duration, low-power radio signals. The LB-1 reports status, event and motion
information as well as battery condition with low-duty cycle transmissio ns, thus greatly increasing the
unit’s battery life. The reporting tone codes may be customized by the user using a software package. The
LB-1 is also capable of transmitting unmodulated tracking pulses for pseudo-doppler type tracking
receivers such as the DTC TRAK/R-2000.
The device may also be programmed to begin or cease transmissions on a schedule based on a real-time
clock. Both the batteries and the antenna are internal to the unit.
The LB-1 is a self-contained beacon featuring:
• DTMF tone generation
• Multi-tone generation
• Tracking Pulse capability
• Breakwire capability
• Standby capability
• User programmability
• Delayed operation mode
• Scheduled operation mode
• Reliable battery contacts with no battery compartment door to lose
• Unique “tape-down” contacts for fine wires (Breakwire and Standby)
• Operator interface through an on-board button and LED
• Special status tones transmitted to indicate lo w battery and motion
• On-board motion detection
• Integrated, optimized antenna
DTC Communications, Inc. Page 2 of 7
LB-1
BREAKWIRE STANDBY
Architecture
The control architecture of the LB-1 consists of three major blocks: the main microprocessor, the audio
generator, and the transmitter.
The main microprocessor is an ultra-low current device, running at 32 KHz. It performs all the timing and
monitoring functions, and communicates with the user via a serial port. The processor uses less than 100
uA of current, which insures a long battery life.
The audio generator is ano ther microprocessor that f unctions as an audio tone generator. It runs at high
speed, which requires more battery power. Thus, it is only powered up when tone generation is required.
The transmitter is a stable, crystal-controlled transmitter with a power output of 30 mW, typical, (50 mW
maximum) over the rated battery life.
Dimensions
The LB-1 is nominally 3.37 in. x 2.125 in. x 0.120 in.
Labeling
The label on the bottom of the PC Board labels all significant functions and co ntacts. The label is designed
to be visually low-key.
Batteries
The only battery that should be inserted into the LB-1 is the CR-2016. The battery will only function when
the negative contact (the button) is toward the label. Inserting the batteries upside down will not harm the
unit, but it will not function properly.
CAUTION
in the slot, and NOT between a contact and the plastic sidewall of the battery compartments. This could
damage the contacts beyond function.
: When inserting batteries, be certain that the battery is going between the gold plated contacts
BATTERY
REMOVAL
HOLD RESET BUTTON
FOR 5 SECONDS FOR
DEFAULT OPERATION
P
R
O
G
R
A
M
RESET
STATUS
DTC Communications, Inc. Page 3 of 7
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