Hartcran House, 231 Kenton Lane, Harrow, Middlesex, HA3 8RP, England
Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233, www.radiometrix.com
Issue 1, 22 January 2013
NBFM Multi-channel transmitter for 868MHz SRD band
The LMT3 is a 25kHz channel narrowband
multichannel transmitter offering up to 25mW RF
power. LMT3 can be paired with the Category 1
compliant receiver intended for European 869.2-
869.25MHz Social Alarm application. It can also be
used for any 868 - 870MHz band Non-Specific SRD
applications. The module offers a low power,
reliable data link in an industry-standard pin out and
footprint.
Figure 1: LMT3 transmitter
Features
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Conforms to EN 300 220-3 and EN 301 489-3
PLL synthesizer with TCXO
Data rates up to 5 kbps for standard module
Usable range over 500m @ 25mW
Fully screened, Low profile
Low power requirements
Applications
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Social Alarm
Handheld terminals
EPOS equipment, barcode scanners
Data loggers
Industrial telemetry and telecommand
In-building environmental monitoring and control
High-end security and fire alarms
DGPS systems
Vehicle data up/download
Heavy vehicle/machinery controls
Technical Summary
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Social Alarm frequencies: CH0: 869.2125MHz, CH1: 869.2375MHz
Custom frequency within 865MHz - 870MHz
32 channels
Transmit power: +10dBm (10mW) / +14dBm (25mW)
Supply range: 3.1 – 15V (TX @ 10mW), 4.1 – 15V (TX @ 25mW)
Current consumption: 34mA @ 10mW, 68mA @ 25mW
Data bit rate: 5kbps max. (standard module)
Serial configuration by inverted RS232 at 3V CMOS level
Evaluation platforms: NBEK + LM Series carrier
Matching receiver: COR3-869-5
Radiometrix Ltd
LMT3 Data Sheet
page 1
RADIOMETRIX [ RADIOMETRIX LTD ]
