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| EW N Issue 1, 06 March 2008 Radiometrix Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England 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. Figure 1: LMT1 transmitter and LMR1 receiver 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 @ 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 LMT1/LMR1 Data Sheet page 1 Radiometrix Ltd Radiometrix Ltd LMT1/LMR1 Data Sheet Figure 2: LMT1 block diagram page 2 Figure 3: LMT1 footpint (top view) Pin description - LMT1 Pin 1a 2a 3a 4a 5a 1b 2b 3b 4b 5b Name Vcc 0V TXE TXD No pin P0/PGM P1 P2 P3 No pin Function 3.1 - 15V power supply (10mW) 4.1V - 15V power supply (100mW) Ground Transmit Enable (active low) DC coupled input for 3V CMOS logic. Rin=47k Not present in LMT1 Parallel Channel select LSB Serial frequency programming / configuration1 Parallel Channel select Parallel Channel select Parallel Channel select MSB Not present in LMT1 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 (50k) to 3v internal rail. Do not exceed 3V logic levels on this port. 3. Channel select inputs are active low 4. TXE has a 100k pullup to Vcc 5. All pins are on an 0.1" grid 6. The pins 5a/b are not present, but are included in footprint for compatibility with other units in this family 7. In the 'off' state a PIN switch open circuits the RF output pin. There are no 'off' state spuri. 8. Unit will operate (with marginally reduced specifications and lower (6-8mW) output power) 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. 9. 100mW versions should not be run continuously from supply voltages > 9v Radiometrix Ltd LMT1/LMR1 Data Sheet page 3 Radiometrix Ltd LMT1/LMR1 Data Sheet Figure 4: LMR1 block diagram page 4 Figure 5: LMR1 footpint (top view) Pin description - LMR1 Pin 1a 2a 3a 4a 5a 1b 2b 3b 4b 5b Name Vcc 0V RXE RXD AF out P0/PGM P1 P2 P3 RSSI 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. 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 (50k) 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 Serial interface commands 2400 baud RS232. 8 bit data, no parity, 1 start bit, 1 or 2 stop bits. Serial data is sent to the unit on one of the parallel channel select pins (P0). It is very important that the unit does not 'decode' switch bounce in ordinary operation as a command string, or spurious rewriting of the e2prom will result. For this reason the user must send the 16 character string ENABLESERIALMODE (followed by a carriage return) to activate the serial command mode before sending any of the command strings listed below. Command mode is disabled on power down, or on reception of a # character. To successfully program the unit, it must be enabled ('RXE high (rx) or TXE low (tx)). GOCHAN aa LOAD aa nnnnn SETPAR SETSER RVALUE rrrr SINGLE nnnnn aa = a two digit channel number from 00 to 31 nnnnn = synthesizer N register value (up to 65535) rrrr = synthesizer R register value (up to 16383) For LMT1 Transmitter: R= N TX f Xtal f channelspacing f RF 173.250MHz = = = 6930 f Channelspacing 25kHz = 10MHz , So R=400 25kHz For LMR1 Receiver: R= f Xtal f channelspacing = 13MHz , So R=520 25kHz N RX = f RF - 21.4MHz 173.250MHz - 21.4 = = 6074 f Channelspacing 25kHz Notes: 1. A pause of at least 50ms must be allowed between command strings (EEPROM programming time). 2. SINGLE mode does not store the N value in EEPROM. Therefore the unit is inoperative after a power down until either another valid SINGLE command is received, or mode is changed by a GOCHAN, SETPAR or SETSER command. SINGLE mode is intended for frequency agile applications. 3. For UK version (173.200 - 173.325MHz band) the following channel assignment is supplied: CH0: 173.250MHz CH1: 173.275MHz CH2: 173.300MHz CH3: 173.325MHz CH4 - CH7: 173.225MHz (only used for alarm applications) CH8 - CH31: 173.325MHz Radiometrix Ltd LMT1/LMR1 Data Sheet page 6 Condensed specifications Frequency Any frequency in the 173MHz and 151MHz bands In UK band, only 173.250, 173.275, 173.300 and 173.325 MHz are used as standard Other custom variants from 130 - 180MHz on any 2MHz band Frequency stability Channel spacing Number of channels Operating temperature Spurious radiations Transmitter Output power Peak deviation TX on switching time Modulation type TX modulation bandwidth Adjacent channel TX power TX spurious Supply Voltage Current Inputs Size Interface 1.5kHz 25kHz (12.5kHz by special order) 16 channels controlled by parallel port or 32 via serial RS232 interface -20 C to +70 C (Storage -30 C to +70 C) Compliant with ETSI EN 300 220-3 and EN 301 489-3 +10dBm (10mW) 1dB nominal (factory adjustable 1 - 25mW) and +20dBm (100mW) 1dB nominal (factory adjustable 25 - 100mW) 3kHz (1.5kHz @ 12.5kHz channel spacing) 30ms from TXE transition FSK (F3D) DC - 5kHz (3V CMOS compatible) <-37dBm <-40dBm (no RF output in Standby) 3.1V - 15V (10 - 25mW) 4.1V - 15V (25 - 100mW); 34mA nominal transmit (@10mW) 90mA nominal transmit (@100mW) <8A standby (TXE high or floating) data (CMOS/TTL compatible) 33 x 23 x 9mm 10 (8) pin 0.1" pitch dual row (5+5) header 2pin 0.1" pitch 1.2mm User RF Recommended PCB hole size Receiver Sensitivity S/N ratio AF bandwidth (-3dB) image Othr spurious Blocking Adjacent channel LO re-radiation Supply Voltage Current Outputs Size Interface -118dBm for 12dB SINAD 35dB (min), 40dB (typ) on AF output 4kHz <-60db <-70dbm Better than 84dB <-60dB -70dBm 3.1V - 15V 20mA receive <1A standby (RXE low) RSSI, audio, data (quasi DC data recovery circuit) 46 x 23 x 9 mm 10 pin 0.1" pitch dual row (5+5) header 2pin 0.1" pitch 1.2mm User RF Recommended PCB hole size Radiometrix Ltd LMT1/LMR1 Data Sheet page 7 RX Received Signal Strength Indicator (RSSI) The LMR1 has wide range RSSI that measures the strength of an incoming signal over a range of 60dB or more. This allows assessment of link quality and available margin and is useful when performing range tests. The output on pin 5b of the module has a standing DC bias of up to 0.5V with no signal, rising to 2.5V at maximum indication (RF input levels of -40dBm and above). Vmin-max is typically 2V and is largely independent of standing bias variations. Output impedance is 40k. Pin 5b can drive a 100A meter directly, for simple monitoring. 2.6 2.4 2.2 2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 -140 -130 -120 -110 -100 -90 RSSI output (V) -80 -70 -60 -50 -40 RF level (dBm) Figure 6: typical RSSI level with respect to received RF level at LMR1 antenna pin Antenna requirements Three types of integral antenna are recommended and approved for use with the module: A) Whip This is a wire, rod ,PCB track or combination connected directly to RF pin of the module. Optimum total length is 410mm (1/4 wave @ 173MHz). Keep the open circuit (hot) end well away from metal components to prevent serious de-tuning. Whips are ground plane sensitive and will benefit from internal 1/4 wave earthed radial(s) if the product is small and plastic cased Wire coil, connected directly to RF pin, open circuit at other end. This antenna is very efficient given it's small size (20mm x 4mm dia.). The helical is a high Q antenna, trim the wire length or expand the coil for optimum results. The helical de-tunes badly with proximity to other conductive objects. A loop of PCB track tuned by a fixed or variable capacitor to ground at the 'hot' end and fed from RF pin at a point 20% from the ground end. Loops have high immunity to proximity de-tuning. A whip *** *** * * B helical ** ** *** ** C loop * * ** *** B) Helical C) Loop Ultimate performance Easy of design set-up Size Immunity proximity effects Radiometrix Ltd LMT1/LMR1 Data Sheet page 8 The antenna choice and position directly controls the system range. Keep it clear of other metal in the system, particularly the 'hot' end. The best position by far, is sticking out the top of the product. This is often not desirable for practical/ergonomic reasons thus a compromise may need to be reached. If an internal antenna must be used, try to keep it away from other metal components, particularly large ones like transformers, batteries and PCB tracks/earth plane. The space around the antenna is as important as the antenna itself. 410mm @ 173MHz R F Whip antenna wire, rod, PCB track or a combination of these length(mm) = 71250 / freq(MHz) R F Helical antenna 35-40 turns wire spring length 120mm, dia 10mm trim wire length or expand coil for best results RF Ctune C match RF GND track width = 1mm 2 min. area 500mm capacitors may be variable or fixed (values depend on loop dimensions) Loop antenna Figure 7: Antenna types Ordering Information: Part No. LMT1-173-5 LMR1-173-5 LMT1-151-5 LMR1-151-5 LMT1-173-5-12k5 LMR1-173-5-12K5 LMT1-151-5-12k5 LMR1-151-5-12k5 LMT1-173-10 LMR1-173-10 LMT1-xxx-5 LMR1-xxx-5 Description Transmitter Receiver Transmitter Receiver Transmitter Receiver Transmitter Receiver Transmitter Receiver Frequency band (MHz) 173.225 - 173.325 173.225 - 173.325 150.825 - 152.450 150.825 - 152.450 173.225 - 173.325 173.225 - 173.325 150.825 - 152.450 150.825 - 152.450 173.225 - 173.325 173.225 - 173.325 RF power (mW) 10 100 Channel spacing (kHz) 25 25 25 25 12.5 12.5 12.5 12.5 25 25 25 25 Data rate kbps 5 5 5 5 5 5 5 5 10 10 5 5 10 100 10 Where xxx is any 2MHz band from 130MHz to-180MHz 10/100 Radiometrix Ltd LMT1/LMR1 Data Sheet page 9 Radiometrix Ltd Hartcran House 231 Kenton Lane Harrow, Middlesex HA3 8RP ENGLAND Tel: +44 (0) 20 8909 9595 Fax: +44 (0) 20 8909 2233 sales@radiometrix.com www.radiometrix.com Copyright notice This product data sheet is the original work and copyrighted property of Radiometrix Ltd. Reproduction in whole or in part must give clear acknowledgement to the copyright owner. Limitation of liability The information furnished by Radiometrix Ltd is believed to be accurate and reliable. Radiometrix Ltd reserves the right to make changes or improvements in the design, specification or manufacture of its subassembly products without notice. Radiometrix Ltd does not assume any liability arising from the application or use of any product or circuit described herein, nor for any infringements of patents or other rights of third parties which may result from the use of its products. This data sheet neither states nor implies warranty of any kind, including fitness for any particular application. These radio devices may be subject to radio interference and may not function as intended if interference is present. We do NOT recommend their use for life critical applications. The Intrastat commodity code for all our modules is: 8542 6000. R&TTE Directive After 7 April 2001 the manufacturer can only place finished product on the market under the provisions of the R&TTE Directive. Equipment within the scope of the R&TTE Directive may demonstrate compliance to the essential requirements specified in Article 3 of the Directive, as appropriate to the particular equipment. Further details are available on The Office of Communications (Ofcom) web site: http://www.ofcom.org.uk/radiocomms/ifi/ Information Requests Ofcom Riverside House 2a Southwark Bridge Road London SE1 9HA Tel: +44 (0)845 456 3000 or 020 7981 3040 Fax: +44 (0)20 7783 4033 information.requests@ofcom.org.uk European Radiocommunications Office (ERO) Peblingehus Nansensgade 19 DK 1366 Copenhagen Tel. +45 33896300 Fax +45 33896330 ero@ero.dk www.ero.dk |
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