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PDF LMR1 Data sheet ( Hoja de datos )
| Número de pieza | LMR1 | |
| Descripción | VHF Narrow Band FM Low Cost multi channel radio modules | |
| Fabricantes | Radiometrix | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LMR1 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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NEW Radiometrix
Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England
Issue 1, 06 March 2008
Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233
LMT1/LMR1
VHF Narrow Band FM Low Cost multi channel radio 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.
Features
Figure 1: LMT1 transmitter and LMR1 receiver
• 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 @ 10mW, 90mA @ 100mW (transmit) and 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
Radiometrix Ltd
LMT1/LMR1 Data Sheet
page 1
1 page  
Figure 5: LMR1 footpint (top view)
Pin description – LMR1
Pin Name
1a Vcc
2a 0V
3a RXE
4a RXD
5a AF out
Function
3.1 – 15V power supply
Ground
Receiver Enable (active high)
Data out (open collector, no pullup)
700mV p-p audio. DC coupled, approx 0.8v bias.`
1b P0/PGM
2b P1
3b P2
4b P3
5b RSSI
Parallel Channel select LSB
Serial frequency programming / configuration1
Parallel Channel select
Parallel Channel select
Parallel Channel select MSB
DC level between 0.5v and 2.2v. 60dB dynamic range
NOTES:
1. Serial programming is by an inverted, cmos logic level, 2400 baud RS232 datastream applied to
the P0 pin.
2. Channel select inputs have pullups (50kΩ) to 3v internal rail. Do not exceed 3v logic levels on
this port.
3. Channel select inputs are active low
4. All pins are on an 0.1" grid
5. Data recovery circuit used for RXD is not a simple 'average and compare' type. It is a peak
sampling quasi-DC coupled design, allowing a greater than usual flexibility in data format.
6. Unit will operate (with marginally reduced specifications) from a 3.0v rail. This must be well
regulated and without noise or ripple, as in this state the unit's internal regulator no longer
operates, and provides no supply rejection.
Radiometrix Ltd
LMT1/LMR1 Data Sheet
page 5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet LMR1.PDF ] | |
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