UHF Narrow Band FM Low cost Multi Channel RF Modules

The LMT1 transmitter and LMR1 receiver modules offer a 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.

Full Specs as PDF

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Features
• Conforms to EN 300 220-3 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 RS232 interface
• Low power requirements

Applications
• 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
• Operating frequency: 173.200 - 173.325MHz (UK band)
150.825 - 152.450MHz (Australian Band)
• Other VHF frequencies available
• 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 (transmit), 20mA (receive)
• Data bit rate: 5kbps max. (Standard module)
• Receiver sensitivity: -118dBm (for 12 dB SINAD)
• Serial configuration by inverted RS232 at 3V CMOS level