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 2, 30 July 2012
VHF Narrow Band FM Low Cost multi channel radio modules
The LMT1 transmitter and LMR1 receiver
modules offer a 12.5kHz / 25kHz channel
spacing multi channel, low power, and
reliable VHF data link. This makes the
LMT1/LMR1 pair ideally suited to those
low power applications where existing
wideband modules have insufficient
range, or where low cost multi-channel
operation
is
needed
without
compromising on RF specification or
regulatory requirement.
Figure 1: LMT1 transmitter and LMR1 receiver
Features
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Conforms to EN 300 220-2 and EN 301 489-3
High performance double superhet. PLL synthesizer with TCXO
quasi-dc (peak sampling) data recovery circuit (for enhanced performance on unbalanced
datastreams)
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Data rates up to 5 kbps for standard module
Usable range over 1km
Fully screened. Low profile
Feature-rich interface (RSSI, analogue and digital baseband)
Re-programmable via UART interface
Low power requirements
Applications
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Handheld terminals
Industrial telemetry and telecommand
In-building environmental monitoring and control
High-end security and fire alarms
Heavy vehicle/machinery controls
Technical Summary
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Operating frequency: 144-146MHz Amateur Radio
150.825-152.450MHz Australian LIPD Band
151.820-154.600MHz US Multi-Use Radio Service (MURS) band
156.525MHz Global Maritime Distress and Safety System
173.200 - 173.325MHz UK Telemetry, Telecommand, Fixed Alarm band
173.20375-173.39625MHz US FCC Part 90.238 Telemetry
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Other custom variants from 130 - 180MHz on any 2MHz band
4 UK allocation channels (32 maximum)
Transmit power: +10dBm (10mW) nominal @ 3.1V (Adjustable 1 - 25mW)
+20dBm (100mW) nominal @ 4.1V (Adjustable 25 - 100mW)
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Supply range: 3.1 – 15V (@10mW) transmitter and receiver
Current consumption: 34mA @ 10mW, 90mA @ 100mW (transmit) and 20mA (receive)
Data bit rate: 5kbps max. (Standard module)
Receiver sensitivity: -118dBm (for 12 dB SINAD)
Evaluation platforms: NBEK + LM Series carrier
Radiometrix Ltd
LMT1/LMR1 Data Sheet
page 1
RADIOMETRIX [ RADIOMETRIX LTD ]
