Radiometrix Ltd

LMT1/LMR1 Data Sheet

page 1

Features

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)

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

Handheld terminals

Industrial telemetry and telecommand

In-building environmental monitoring and control

High-end security and fire alarms

Heavy vehicle/machinery controls

Technical Summary

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

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)

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)

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

VHF Narrow Band FM Low Cost multi channel radio modules

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

LMT1/LMR1