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 w ith 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 syst em 173.200 - 173.325mhz uk telemetry, telecommand, fix ed 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 (adju stable 1 - 25mw) +20dbm (100mw) nominal @ 4.1v (adjustable 25 - 100m w) supply range: 3.1 ? 15v (@10mw) transmitter and rec eiver current consumption: 34ma @ 10mw, 90ma @ 100mw (tra nsmit) and 20ma (receive) data bit rate: 5kbps max. (standard module) receiver sensitivity: -118dbm (for 12 db sinad) evaluation platforms : nbek + lm series carrier 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 223 3, www.radiometrix.com issue 2, 30 july 2012 lmt1/lmr1
radiometrix ltd lmt1/lmr1 data sheet page 2 figure 2: lmt1 block diagram
radiometrix ltd lmt1/lmr1 data sheet page 3 figure 3: lmt1 footprint (top view) pin description ? lmt1 pin name function 1a vcc 3.1 ? 15v power supply (10mw) 4.1v ? 15v power supply (100mw) 2a 0v ground 3a txe transmit enable (active low) 4a txd dc coupled input for 3v cmos logic. r in =47k see note 10 below for phase modulation (?pm) versio n 5a no pin not present in lmt1 1b p0/pgm parallel channel select lsb serial frequency programming / configuration 1 2b p1 parallel channel select 3b p2 parallel channel select 4b p3 parallel channel select msb 5b no pin not present in lmt1 notes: 1. serial programming is by an inverted, cmos logic level, 2400 baud uart data stream applied to the p0 pin. 2. channel select inputs have pull-ups (50k ) to 3v internal rail. do not exceed 3v logic level s on this port. 3. channel select inputs are active low 4. txe has a 100k pull-up 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 th e rf output pin. there are no 'off' state spurii. 8. unit will operate (with marginally reduced speci fications 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 intern al regulator no longer operates, and provides no suppl y rejection. 9. 100mw versions should not be run continuously fr om supply voltages > 9v 10. phase modulation (-pm) version lmt1 : 2.6v peak-to-peak level 2100hz sinewave tone via an external 680pf series capacitor will produce fm dev iation of 4.2khz. rf gnd txd lmt 2.6v pk-pk 2100hz 680pf the external 680pf series capacitor on lmt1 txd inp ut provides a defined 6db per octave pre emphasis response, to mimic the behavior of a phase modulated transmitter.
radiometrix ltd lmt1/lmr1 data sheet page 4 figure 4: lmr1 block diagra m
radiometrix ltd lmt1/lmr1 data sheet page 5 figure 5: lmr1 footprint (top view) pin description ? lmr1 pin name function 1a vcc 3.1 ? 15v power supply 2a 0v ground 3a rxe receiver enable (active high) 4a rxd data out (open collector, no pull-up) 5a af out 700mv p-p audio. dc coupled, approx 0.8v bias. 1b p0/pgm parallel channel select lsb serial frequency programming / configuration 1 2b p1 parallel channel select 3b p2 parallel channel select 4b p3 parallel channel select msb 5b rssi dc level between 0.5v and 2.2v. 60db dynam ic range notes: 1. serial programming is by an inverted, cmos logic level, 2400 baud uart data stream applied to the p0 pin. 2. channel select inputs have pull-ups (50k ) to 3v internal rail. do not exceed 3v logic level s 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 us ual flexibility in data format. 6. unit will operate (with marginally reduced specific ations) from a 3.0v rail. this must be well regulat ed and without noise or ripple, as in this state the u nit's internal regulator no longer operates, and provides no supply rejection.
radiometrix ltd lmt1/lmr1 data sheet page 6 serial interface commands 2400 baud uart. 8 bit data, no parity, 1 start bit , 1 or 2 stop bits. serial data is sent to the unit on one of the paral lel channel select pins (p0). it is very important that the unit does not 'decode' switch bounce in ordinary operati on as a command string, or spurious re-writing of t he e2prom will result. for this reason the user must s end the 16 character string enableserialmode (followed by a carriage return) to activate the ser ial command mode before sending any of the command strings listed below. command mode is disabled on p ower 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 serially select channel aa, where aa is ch0 to ch31 load aa nnnnn set value of n register for channe l aa, where aa is channels 0 to 31 setpar channel selected by 4 bit parallel inputs (c h0 to ch15 only) setser channel selected by most recent gochan opera tion rvalue rrrr set value for r register single nnnnn set value of n for single channel oper ation. n value not stored in eeprom process entry / clear all buffers # disable command mode 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 : khz mhz f f r cing channelspa xtal 25 10 = = , so r=400 6930 25 250 . 173 = = = khz mhz f f n cing channelspa rf tx for lmr1 receiver : khz mhz f f r cing channelspa xtal 25 13 = = , so r=520 notes : 1. a pause of at least 50ms must be allowed between co mmand strings (eeprom programming time). 2 . single mode does not store the n value in eeprom. t herefore the unit is inoperative after a power down until either another valid single comman d is received, or mode is changed by a gochan, setpar or setser command. single mode is in tended 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 applicat ions) ch8 - ch31: 173.325mhz 6074 25 4. 21 250 . 173 4. 21 = ? = ? = khz mhz f mhz f n cing channelspa rf rx
radiometrix ltd lmt1/lmr1 data sheet page 7 condensed specifications 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 syst em 173.200-173.325mhz (uk telemetry, telecommand, alar m) 173.20375-173.39625mhz us fcc part 90.238 telemetry other custom variants from 130 - 180mhz on any 2mhz band frequency stability 1.5khz channel spacing 25khz (12.5khz by special order) number of channels 16 channels controlled by parallel port or 32 via serial uart interface operating temperature -20 oc to +70 oc (storage -3 0 oc to +70 oc) spurious radiations compliant with etsi en 300 220- 3 and en 301 489-3 transmitter output power +10dbm (10mw) 1db nominal (factory ad justable 1 - 25mw) and +20dbm (100mw) 1db nominal (factory adjustable 25 - 100mw) peak deviation 3khz (1.5khz @ 12.5khz channel spa cing) -pm version: 4.2khz (for 2.6v pk-pk 2100hz) tx on switching time 30ms from txe transition modulation type fsk (f3d) phase modulation (-pm version) tx modulation bandwidth dc ? 5khz (3v cmos compatib le) adjacent channel tx power <-37dbm tx spurious <-40dbm (no rf output in standby) supply voltage 3.1v ? 15v (10 ? 25mw) 4.1v ? 15v (25 ? 100mw); current 34ma nominal transmit (@10mw) 90ma nominal transmit (@100mw) <8 a standby (txe high or floating) inputs data (cmos/ttl compatible) size 33 x 23 x 9mm interface user 10 (8) pin 0.1" pitch dual row (5+5) header rf 2pin 0.1? pitch recommended pcb hole size 1.2mm receiver sensitivity -118dbm for 12db sinad s/n ratio 35db (min), 40db (typ) on af output af bandwidth (-3db) 4khz image <-60db other spurious <-70dbm blocking better than 84db adjacent channel <-60db lo re-radiation -70dbm supply voltage 3.1v ? 15v current 20ma receive <1 a standby (rxe low) outputs rssi, audio, data (quasi dc data recovery c ircuit) size 46 x 23 x 9 mm interface user 10 pin 0.1" pitch dual row (5+5) header rf 2pin 0.1? pitch recommended pcb hole size 1.2mm
radiometrix ltd lmt1/lmr1 data sheet page 8 rx received signal strength indicator (rssi) the lmr1 has wide range rssi that measures the stre ngth of an incoming signal over a range of 60db or more. this allows assessment of link quality and av ailable margin and is useful when performing range tests. the output on pin 5b of the module has a standing d c bias of up to 0.5v with no signal, rising to 2.5v at maximum indication (rf input levels of -40dbm and a bove). ? vmin-max is typically 2v and is largely independent of standing bias variations. output imp edance is 40k . pin 5b can drive a 100 a meter directly, for simple monitoring. 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 rf level (dbm) rssi output (v) figure 6: typical rssi level with respect to receiv ed 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 conn ected 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-tu ning. whips are ground plane sensitive and will benefit from internal 1/4 wave e arthed radial(s) if the product is small and plastic cased b) helical wire coil, connected directly to rf pin, open circu it 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. c) loop a loop of pcb track tuned by a fixed or variable c apacitor to ground at the 'hot' end and fed from rf pin at a point 20% from the ground end. loo ps have high immunity to proximity de- tuning. feature a b c whip helical loop ultimate performance *** ** * easy of design set-up *** ** * size * *** ** immunity proximity effects * ** ***
radiometrix ltd lmt1/lmr1 data sheet page 9 the antenna choice and position directly controls t he system range. keep it clear of other metal in th e system, particularly the 'hot' end. the best positi on 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 othe r metal components, particularly large ones like transformers, batteries and pcb tracks/earth plane. the space around the antenna is as important as th e antenna itself. helical antenna rf loop antenna rf gnd rf c tune c match capacitors may be variable or fixed (values depend on loop dimensions) track width = 1mm min. area 500mm 2 whip antenna 410mm @ 173mhz rf wire, rod, pcb track or a combination of these length(mm) = 71250 / freq(mhz) trim wire length or expand coil for best results 35-40 turns wire spring length 120mm, dia 10mm figure 7: antenna types ordering information: part no. description channel frequencies (mhz) rf power (mw) channel spacing (khz) data rate kbps lmt1-144-5 transmitter ch0:144.000 C ch31:144.775 100 25 5 lmr1-144-5 receiver lmt1-151-5 transmitter ch0:150.825 C ch31:151.600 100 25 5 lmr1-151-5 receiver lmt1-151-5-12k5-murs transmitter ch0:150.820, ch1: 150.880, ch2:151.940, ch3:154.570, ch4:154.600 100 12.5 5 LMR1-151-5-12K5-MURS receiver lmt1-156.525-pm transmitter 156.525mhz 100 25 2.6v pk-pk 2.1khz lmt1-173-5 transmitter ch0:173.250 C ch3:173.325 ch4 C ch7:173.225 ch8 C ch31:173.325 10 25 5 lmr1-173-5 receiver lmt1-173-5-12k5-fcc transmitter ch0:173.20375, ch1: 173.210, ch2:173.2375, ch3:173.2875, ch4:173.3125, ch5:173.3375, ch6:173.3625, ch7:173.39625 100 12.5 5 lmr1-173-5-12k5-fcc receiver lmt1-xxx-5 where xxx is any 2mhz band from 130mhz t o- 180mhz 10/100 25 5 lmr1-xxx-5
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 co pyrighted 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 bel ieved 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 lt d does not assume any liability arising from the application or use of any product or circuit descri bed herein, nor for any infringements of patents or other rights of third parties which may result from the u se of its products. this data sheet neither states nor implies warranty of any kind, including fitness for any particular application. these radio devices ma y 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 particula r equipment. further details are available on the office of comm unications (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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