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radiometrix ltd., tx1 & RX1 data sheet page 1 features ce certified by independent notified body verified to comply with harmonised eu standards ets i en 300 220-3 (radio) and en 301 489-3 (emc) by accredited test laboratory frequencies available as standard: 173.225mhz, 173. 250mhz other frequencies from 151.300mhz to 173.250mhz ava ilable to order data rates up to 10 kbps with 25khz channel spacing usable range to 10km+ screened construction available for licence-exempt operation in the uk 17 3mhz bands, the tx1 & RX1 modules combine effective screening with internal filtering to minimise spuri ous radiation and susceptibility thereby ensuring e mc compliance. they are particularly suitable for one- to-one and multi-node wireless links where longer r anges are required at low to moderate data rates. applica tions include building security, epos and inventory tracking, remote industrial process monitoring and data networks. because of their small size and low power consumption, both modules are ideal for use in batt ery-powered portable applications such as hand-held terminals. technical summary transmitter - tx1 2 stage crystal controlled, nbfm modulated at up to 10 kb/s operation from 2.2v to 12v @ 9.5ma built-in regulator for improved stability and suppl y noise rejection exceptional power efficiency, typically 35% dc rf @ 3v supply +10dbm (10mw) rf output harmonics typically -70dbc enable facility receiver - RX1 single conversion nbfm superhet image rejection >50db operation from 2.7v to 12v @ 12ma built-in regulator for improved stability and suppl y noise rejection 10kbps, -116dbm sensitivity @ 1ppm ber rssi output with >80db range local oscillator leakage <-60 dbm enable facility evaluation platforms : nbek + sil carrier left: tx1 transmitter right:RX1receiver the tx1 and RX1 form a miniature vhf radio transmitter/receiver pair designed for pcb mounting and suitable for extended range data links at speeds up to 10kbps. link ranges of 10km+ are achievable with suitable choice of data rate and antennas. vhf narrow band fm transmitter and receiver vhf narrow band fm transmitter and receiver vhf narrow band fm transmitter and receiver vhf narrow band fm transmitter and receiver 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, 01 august 2012 tx 1 / RX1
radiometrix ltd., tx1 & RX1 data sheet page 2 functional description the tx1 module is a two stage crystal controlled nb fm transmitter operating between 2.2v and 12v at a current of 9.5ma. at 3v supply it delivers nominall y +10dbm rf output. the sil style tx1 measures 32 x 12 x 3.8 mm excluding the pins. the RX1 module is a single conversion nbfm superhet receiver capable of handling data rates of up to 10kbps. it will operate from a supply of 2.7v to 12 v and draws 12ma when receiving. a signal strength (rssi) output with greater than 80db of range is pr ovided. the sil style RX1 measures 48 x 17.5 x 5.5 mm excluding the pins. tx1 transmitter lowpass filter pa bandpass filter x2 vcxo 7khz lpf 100k supply regulator 1 rf gnd 2 rf out 3 rf gnd 4 en 5 vcc 6 0v 7 txd en (pin 4) tx enable. 0.15v on this pin disables module (current <1 a), 1.7v enables module. input impedance 1m approx. observe slew rate requirements (see applica tions notes). vcc (pin 5) dc +ve supply. max ripple content 0.1v p-p. decoupling is not generally required. 0v (pin 6) dc supply ground. internally connected to pins 1, 3 and module screen. txd (pin 7) dc-coupled modulation input. accepts serial digital data at 0v to 3v levels. see applications notes for suggested drive methods. input impedance 100k nominal. fig.2: tx1 physical dimensions pin description rf gnd (pins 1 & 3) rf ground, internally connected to the module screen and pin 6 (0v). these pins should be directly connected to the rf return path - e.g. coax braid, main pcb ground plane etc. rf out (pin 2) 50 rf output to antenna. internally dc- isolated. see antenna section of applications notes for details of suitable antennas / feeds. fig.1: tx1 block diagram 3.8 mm 32 mm 12.0 mm 12.5 mm pcb level radiometrix tx1 pin spacing: 2.54 mm 7 holes of 0.7 mm dia. pin spacing 2.54 mm 15.24 mm 1 2 3 4 5 6 7 1 = rf gnd 2 = rf out 3 = rf gnd 4 = en 6 = 0v 7 = txd 5 = vcc
radiometrix ltd., tx1 & RX1 data sheet page 3 RX1 receiver bandpass filter x2 7khz lpf supply regulator 3 rf gnd 1 rf in 2 rf gnd 4 en 7 vcc 6 0v preamp. mixer bandpass filter xtal osc/mult. if1 if2 if amplification / filtering fm discriminator regulated rx supply 5 rssi 9 rxd 8 af out af buffer adaptive data slicer 10k en (pin 4) rx enable. 0.15v on this pin disables module (current <1 a), 1.7v enables module. input impedance 1m approx. observe slew rate requirements (see applica tions notes). rssi (pin 5) received signal strength indicator with >80db range . see applications notes for typical characteristic s. 0v (pin 6) dc supply ground. internally connected to pins 2, 3 and module screen. vcc (pin 7) dc +ve supply. max ripple content 0.1v p-p. decoupling is not generally required. af out (pin 8) buffered and filtered analogue output from the fm d emodulator. it has a standing dc bias of 1v and 400 mv p- p baseband signal. useful as a test point or to driv e external decoders (see applications notes). exter nal load should be >1k // <100pf. rxd (pin 9) digital output from internal data slicer (squared v ersion of the signal on pin 8). it may be used to d rive external decoders. the data is true data, i.e. as f ed to the transmitter. output is ?open-collector? format with internal 10k pullup to vcc (pin 7). pin description rf in (pin 1) 50 rf input from antenna. internally dc- isolated. see antenna section of applications notes for suggested antennas and feeds. rf gnd (pins 2 & 3) rf ground, internally connected to the module screen and pin 6 (0v). these pins should be directly connected to the rf return path - e.g. coax braid, main pcb ground plane etc. fig.3: RX1 block diagram fig.4: RX1 physical dimensions 9 holes of 0.7 mm dia. pin spacing 2.54mm 1 2 3 48 mm 17.5 mm 18.0 mm pcb level radiometrix RX1 4 5 6 7 9 8 25.4 mm pin spacing: 2.54 mm 1 = rf in 2 = rf gnd 3 = rf gnd 4 = en 5 = rssi 6 = 0v 7 = vcc 8 = af out 9 = rxd 5.5 mm
radiometrix ltd., tx1 & RX1 data sheet page 4 absolute maximum ratings exceeding the values given below may cause permanen t damage to the module. operating temperature -20 c to +60 c storage temperature -40 c to +100 c tx1 vcc, txd (pins 5,7) -0.3v to +16.0v en (pin 4) -0.3v to +vcc v rf out (pin 2) 50v @ <10mhz, +20dbm @ >10mhz RX1 vcc, rxd (pins 7,9) -0.3v to +16.0v en, rssi, af (pins 4,5,8) -0.3v to +vcc v rf in (pin 1) 50v @ <10mhz, +13dbm @ >10mhz performance specifications: tx1 transmitter (vcc = 3.0v / temperature = 20 c unless stated) pin min. typ. max. units notes dc supply supply voltage 5 2.2 3.0 12 v supply current 5 9.5 11 ma rf rf power output @ vcc = 2.2v 2 +4.5 +6 +7.5 dbm 1 rf power output @ vcc 2.8v 2 +8.5 +10 +11.5 dbm 1 spurious emissions 2 -70 -55 dbc 2 frequency accuracy -2.0 0 +2.0 khz 3 fm deviation (peak) 2.5 3.0 3.5 khz 4 baseband modulation bandwidth @ -3db 0 7 khz modulation distortion (thd) 10 15 % 7 txd input level (logic low) 7 -0.2 0 0.2 v 5,7 txd input level (logic high) 7 2.8 3.0 3.2 v 5,7 dynamic timing power-up time (en full rf) 2 5 ms 6,7 notes: 1. measured into 50 resistive load. 2. exceeds en/emc requirements at all frequencies. 3. total over full supply and temperature range. 4. with 0v ? 3.0v modulation input. 5. to achieve specified fm deviation. 6. dependent upon txd conditions during power-up. 7. see applications information for further details .
radiometrix ltd., tx1 & RX1 data sheet page 5 performance specifications: RX1 receiver (vcc = 3.0v / temperature = 20 c unless stated) pin min. typ. max. units notes dc supply supply voltage 7 2.7 3.0 12 v supply current 7 12 14 ma rf/if rf sensitivity @ 10db (s+n)/n 1, 8 -119 -115 dbm rf sensitivity @ 1ppm ber 1, 9 -116 -112 dbm ip 3 at rf input 1 -28 dbm rssi threshold 1, 5 -127 dbm 1 rssi range 1, 5 80 90 db 1 if bandwidth 15 khz image rejection 1 50 55 db adjacent channel rejection 1 50 55/60 db 2 spurious response rejection 1 70 100 db lo leakage, conducted 1 -70 -65 dbm 3 lo leakage, radiated -70 -60 dbm 3 baseband baseband bandwidth @ -3db 8 0.05 6 khz 1, 4 af level 8 400 mv p - p 5 dc offset on af out 8 0.7 1.0 1.3 v distortion on recovered af 8 1 10 % load capacitance, afout / rxd 8, 9 100 pf dynamic timing power up with signal present power up to valid rssi 4, 5 4 5 ms power up to stable data 4, 9 16 20 ms signal applied with supply on signal to valid rssi 1, 5 0.4 0.6 ms signal to stable data 1, 9 4 12 ms 6 time between data transitions 9 1.8 0.1 ms 7 mark : space ratio 9 20 50 80 % 8 notes: 1. see applications information for further details . 2. typically 55db @ +25khz offset, 60db @ -25khz of fset. 3. exceeds en/emc requirements at all frequencies. 4. lower limit can be extended to dc if required, b y means of external circuitry. 5. for received signal with 3khz fm deviation. 6. typically 4ms for signal at channel centre, maxi mum 12ms at 4khz rf offset. 7. for 50:50 mark to space ratio (i.e. squarewave). 8. average over 50ms period at maximum bit rate.
radiometrix ltd., tx1 & RX1 data sheet page 6 module test circuits radiometrix tx1 txd vcc 0v (gnd) 1 2 3 4 5 7 6 en 50 rf out 3v 0v 5khz max. fig.5: tx1 test circuit radiometrix RX1 1 2 3 8 9 4 5 6 7 rf in 50 rxd rssi af out vcc en 0v (gnd) fig.6: RX1 test circuit applications information power supply requirements both modules have built-in regulators which deliver a constant 2.85v to the module circuitry when the external supply voltage is 2.9v or greater, with 40 db or more of supply ripple rejection. this ensures constant performance up to the maximum permitted rail, and r emoves the need for external supply decoupling exce pt in cases where the supply rail is extremely poor (r ipple/noise content >0.1v p-p ). note, however, that for supply voltages lower than 2.85v the regulator is effectively inoperative and supply ripple rejection is considerably reduced. under the se conditions the ripple/noise on the RX1 supply ra il should be below 20mv p-p to avoid problems. if the quality of the supply is in doubt, it is recommended that a 10 f tantalum or similar capacitor be added between pin 7 of the module (vcc) and ground together with a 10 series feed resistor between pin 7 and the supply r ail. the enable pin allows the module to be turned on or off under logic control with a constant dc supply to the vcc pin. the module current in power-down mode is l ess than 1 a. note: if this facility is used, the logic control signal must have a slew rate of 40mv/ s or more. slew rates less than this value may cause erratic operation of the on-board regulator and therefore the module it self. the enable pin should be tied directly to the vcc p in if this facility is not required.
radiometrix ltd., tx1 & RX1 data sheet page 7 tx1 modulation requirements the module is factory-set to produce the specified fm deviation with a txd input to pin 7 of 3v amplit ude, i.e. 0v ?low?, 3v ?high?. reducing the amplitude of the data input from this value (usually as a result of reducing the supply voltage) reduces the transmitted fm devi ation to typically 2.5khz at the lower extreme of 2.2v. the receiver will cope with this quite happily and no significant degradation of link performance shou ld be observed as a result. where the module supply is greater than 3v a resist or must be added in series with the txd input to li mit the modulation amplitude to a maximum of 3v on pin 7. t xd input resistance is 100k to ground, giving typical required resistor values as follows: vcc series resistor 3v 3.3v 5v 9v - 10 k 68k 220k it should be noted that conditions on txd have a si gnificant effect on the startup time of the module, i.e. the time between en (or en+vcc) going high and full rf output being produced. for fastest startup txd shou ld either be low or fed with data (preamble etc) for a minimum of 3ms after en has been asserted. startup time under these conditions is typically 50-70% of that obtained if txd is held high over the same period. reducing the output power of the tx1 if the tx1-173.250-10 is to be used for other than industrial/commercial applications its output power must be reduced to 1mw to comply with type approval require ments. this is done by inserting a 10db attenuator network between the module and the antenna or feed, as follows: tx1 1 2 3 4 5 7 6 68r 100r antenna 100r 100r 68r ground foil/ vias to ground plane 50 ohm microstrip lines to antenna from tx1 schematic diagram physical arrangement resistors are smd (0603/0805) fig.7: 10db attenuator for tx1 keep all tracking around the attenuator network as short as possible, particularly ground paths, and u se matched 50 microstrip lines for input and output connections (track width of 2.5mm if using 1.6mm thick fr4 pcb).
radiometrix ltd., tx1 & RX1 data sheet page 8 RX1 received signal strength indicator (rssi) the RX1 receiver incorporates a wide range rssi whi ch measures the strength of an incoming signal over a range of 80db or more. this allows assessment of li nk quality and available margin and is useful when performing range tests. please note that the actual rssi voltage at any giv en rf input level varies somewhat between units. th e rssi facility is intended as a relative indicator o nly - it is not designed to be, or suitable as, an accurate and repeatable measure of absolute signal level or tran smitter-receiver distance. the output on pin 5 of the module has a standing dc bias of 0.15v-0.45v (0.25v typ.) with no signal, r ising to 0.9-1.3v (1.15v typ.) at maximum indication. output impedance is 10k . pin 5 can drive a 100 a meter directly, for simple monitoring. typical rssi characteristic is shown below (this is for indicative purposes only and is not a guarante e of actual rssi characteristics): 0 0.2 0.4 0.6 0.8 1 1.2 - 1 25 - 1 20 - 1 15 - 1 10 - 1 05 - 1 00 - 9 5 - 9 0 - 8 5 - 8 0 - 7 5 - 7 0 - 6 5 - 6 0 - 5 5 - 5 0 - 4 5 - 4 0 - 3 5 rf input level (dbm) rssi output voltage (v) fig.8: typical rssi response curve to ensure a reasonably fast response the rssi line has limited internal decoupling of 11nf to ground. this results in a small amount of audio ripple on the dc output at pin 5 of the module. if this is a proble m further decoupling may be added at the expense of response speed, in the form of a capacitor from pin 5 to gro und. for example, adding an extra 0.1 f on this pin will increase the rssi response time to around 4ms. expected range predicting the range obtainable in any given situat ion is notoriously difficult since there are many f actors involved. the main ones to consider are as follows: ? type and location of antennas in use (see pages 10 -12) ? type of terrain and degree of obstruction of the l ink path ? sources of interference affecting the receiver ? ?dead? spots caused by signal reflections from nea rby conductive objects ? data rate and degree of filtering employed (see pa ge 9) the following are typical examples ? but range test s should always be performed before assuming that a particular range can be achieved in a given situati on: data rate tx antenna rx antenna environment range 1.2kbps half-wave half-wave rural/open 10-15km 10kbps half-wave half-wave rural/open 3-4km 10kbps helical half-wave urban/obstructed 500m-1km 10kbps helical helical in-building 100-200m note: the figure for 1.2kbps assumes that the receiver bandwidth has been suitably reduced by utilising an outboard audio filter/data slicer or similar arrang ement. if the RX1 is used ?as is? the range will be simila r to that for 10kb/s.
radiometrix ltd., tx1 & RX1 data sheet page 9 data formats and range extension the tx1 data input is normally driven directly by l ogic levels but will also accept analogue drive (e. g. 2-tone signalling). in this case it is recommended that tx d (pin 7) be dc-biased to 1.2v approx. with the mod ulation ac-coupled and limited to a maximum of 2v p-p to minimise distortion over the link. the varactor modulator in the tx1 introduces some 2 nd harmonic distortion which may be reduced if necess ary by predistortion of the analogue waveform. at the other end of the link the RX1 af output is used to drive an external decoder directly. although the modulation bandwidth of the tx1 extend s down to dc, as does the af output of the RX1, it is not advisable to use data containing a dc component . this is because frequency errors and drifts betwe en the transmitter and receiver occur in normal operat ion, resulting in dc offset errors on the RX1 audio output. the RX1 in standard form incorporates a low pass fi lter with a 6khz nominal bandwidth. in conjunction with similar filtering in the tx1 an overall system band width of 5khz is obtained. this is suitable for tra nsmission of data at raw bit rates up to 10kb/s. a lower roll off frequency of around 50hz has been chosen for th e internal filter and data slicer in order to keep re ceiver settling times reasonably fast. this results in a lowest usable data speed of about 1kb/s for the standard m odule. in applications such as long range fixed links wher e data speed is not of prime concern, a considerabl e increase in range can be obtained by using the slow est possible data rate together with filtering to r educe the receiver bandwidth to the minimum necessary. the in ternal data slicer is not suitable for data having longer than 1.8ms between transitions and in such circumst ances the RX1 audio output can be utilised to drive an external filter and data slicer. the RX1 produces an audio output of approximately 4 00mv p-p at pin 8, but due to the internal filtering this exhibits a rolloff at low frequencies giving a redu ced output of some 100mv p-p as dc is approached. this rolloff can be eliminated and a flat response to dc obtained by using an external rc compensation netw ork, as follows: 100k 33k 100nf input from RX1 pin 8 output to low pass filter, etc. 100mv p-p, high impedance fig.9: audio compensation network the output of the network will be flat from dc to 5 khz+. it will have a standing dc bias of 1v approx. and should not be significantly loaded (input impedance of following stage should ideally be 1m ).
radiometrix ltd., tx1 & RX1 data sheet page 10 antennas the choice and positioning of transmitter and recei ver antennas is of the utmost importance and is the single most significant factor in determining system range . the following notes are intended to assist the us er in choosing the most effective antenna type for any gi ven application. integral antennas these are relatively inefficient compared to the la rger externally-mounted types and hence tend to be effective only over limited ranges. they do however result in physically compact equipment and for thi s reason are often preferred for portable application s. particular care is required with this type of an tenna to achieve optimum results and the following should be taken into account: 1. nearby conducting objects such as a pcb or batte ry can cause detuning or screening of the antenna which severely reduces efficiency. ideally the ante nna should stick out from the top of the product an d be entirely in the clear, however this is often not de sirable for practical/ergonomic reasons and a compromise may need to be reached. if an internal a ntenna must be used try to keep it away from other metal components and pay particular attention to th e ?hot? end (i.e. the far end) as this is generally the most susceptible to detuning. the space around the antenna is as important as the antenna itself. 2. microprocessors and microcontrollers tend to rad iate significant amounts of radio frequency hash wh ich can cause desensitisation of the receiver if its an tenna is in close proximity. the problem becomes wo rse as logic speeds increase, because fast logic edges generate harmonics across the vhf range which are then radiated effectively by the pcb tracking. in e xtreme cases system range may be reduced by a facto r of 5 or more. to minimise any adverse effects situa te antenna and module as far as possible from any such circuitry and keep pcb track lengths to the mi nimum possible. a ground plane can be highly effective in cutting radiated interference and its use is strongly recommended. a simple test for interference is to monitor the re ceiver rssi output voltage, which should be the sam e regardless of whether the microcontroller or other logic circuitry is running or in reset. the following types of integral antenna are in comm on use: quarter-wave whip. this consists simply of a piece of wire or rod con nected to the module at one end. at 173mhz the total length should be 410mm from module pin to antenna tip including any interconnecting w ire or tracking. because of the length of this antenna it is almost always external to the product casing. helical. this is a more compact but slightly less effective antenna formed from a coil of wire. it is very efficient for its size, but because of its high q i t suffers badly from detuning caused by proximity t o nearby conductive objects and needs to be carefully trimme d for best performance in a given situation. the si ze shown is about the maximum commonly used at 173mhz and appropriate scaling of length, diameter and number of turns can make individual designs much sm aller. loop. a loop of pcb track having an inside area as large as possible (minimum about 5cm 2 ), tuned and matched with 2 capacitors. loops are relatively ine fficient but have good immunity to proximity detuni ng, so may be preferred in shorter range applications wher e high component packing density is necessary.
radiometrix ltd., tx1 & RX1 data sheet page 11 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 c1 c2 c3 c4 fig.10: integral antenna configurations integral antenna summary: feature whip helical loop ultimate performance *** ** * ease of design set-up *** ** * size * *** ** immunity to proximity effects ** * *** tamper-proof integral antenna where the RX1 is used in alarm applications it may sometimes be necessary to provide a warning if any attempt is made to remove or disable its antenna. a typical solution to this problem is as follows: fig.11: tamper-proof antenna arrangement in normal operation the output will have a resistan ce to ground of r1+r2. if the antenna is shorted to ground it will show r2 only, and if the antenna is cut it will be open-circuit. r1 and r2 may be any value over 1k . all track lengths should be kept to a minimum and the output may need to be decoupled in some cases to avoid noise b eing injected into the antenna from the following circuitry. RX1 1 2 3 8 9 4 5 6 7 r2 1/4 wave hairpin loop antenna r1 1n to comparator circuit, etc.
radiometrix ltd., tx1 & RX1 data sheet page 12 external antennas these have several advantages if portability is not an issue, and are essential for long range links. external antennas can be optimised for individual circumstan ces and may be mounted in relatively good rf locati ons away from sources of interference, being connected to the equipment by coax feeder. helical. of similar dimensions and performance to the integ ral type mentioned above, commercially-available helical antennas normally have the coil element pro tected by a plastic moulding or sleeve and incorpor ate a coax connector at one end (usually a straight or ri ght-angle bnc type). these are compact and simple t o use as they come pre-tuned for a given application, but are relatively inefficient and are best suited to shorter ranges. quarter-wave whip. again similar to the integral type, the element usu ally consists of a stainless steel rod or a wire contained within a semi-flexible moulded pla stic jacket. various mounting options are available , from a simple bnc connector to wall brackets, through-pane l fixings and magnetic mounts for temporary attachm ent to steel surfaces. a significant improvement in performance is obtaina ble if the whip is used in conjunction with a metal ground plane. for best results this should extend all roun d the base of the whip out to a radius of 300mm or more (under these conditions performance approaches that of a half-wave dipole) but even relatively small m etal areas will produce a worthwhile improvement over th e whip alone. the ground plane should be electrical ly connected to the coax outer at the base of the whip . magnetic mounts are slightly different in that th ey rely on capacitance between the mount and the metal surface to achieve the same result. a ground plane can also be simulated by using 3 or 4 quarter-wave radials equally spaced around the ba se of the whip, connected at their inner ends to the oute r of the coax feed. a better match to a 50 coax feed can be achieved if the elements are angled downwards at approximately 30-40 to the horizontal. fig.12: quarter wave antenna / ground plane configu rations 50 coax feed metal ground plane 50 coax feed 3 0 - 4 0 d e g . (3-4, equal ly s paced) 1/ 4 -w av e rad ial elem ents 1/4-wave whip (410mm long @ 173mhz) 1/4-wave whip
radiometrix ltd., tx1 & RX1 data sheet page 13 half-wave. there are two main variants of this antenna, both o f which are very effective and are recommended where long range and all-round coverage are required: 1. the half-wave dipole consists of two quarter-wave w hips mounted in line vertically and fed in the cent re with coaxial cable. the bottom whip takes the place of the ground plane described previously. a varian t is available using a helical instead of a whip for the lower element, giving similar performance with red uced overall length. this antenna is suitable for mounti ng on walls etc. but for best results should be kep t well clear of surrounding conductive objects and structu res (ideally >1m separation). 2. the end-fed half wave is the same length as the dip ole but consists of a single rod or whip fed at the bottom via a matching network. mounting options are similar to those for the quarter-wave whip. a ground plane is sometimes used but is not essential . the end-fed arrangement is often preferred over the centre-fed dipole because it is easier to mount in the clear and above surrounding obstructions. yagi. this antenna consists of two or more elements mount ed parallel to each other on a central boom. it is directional and exhibits gain but tends to be large and unwieldy ? for these reasons the yagi is the i deal choice for links over fixed paths where maximum ran ge is desired. please note: using a yagi or other gain antenna with the tx1 wil l exceed the maximum radiated power permitted by uk type approval regulations. it can b e used in the uk only in conjunction with the RX1 receiver. for best range in uk fixed link applications use a half-wave antenna on transmit and a half-wave or ya gi on receive, both mounted as high as possible and clear of obstructions. module mounting considerations the modules may be mounted vertically or bent horiz ontal to the motherboard. note that the four compon ents mounted on the underside of the RX1 are relatively fragile ? avoid direct mechanical contact between t hese and other parts of the equipment if possible, parti cularly in situations where extreme mechanical stre sses could routinely occur (as a result of equipment bei ng dropped onto the floor, etc). good rf layout practice should be observed. if the connection between module and antenna is more than about 20mm long use 50 microstrip line or coax or a combination of both. it is desirable (but not essential) to fill all unused pcb area around the module with ground plane.
radiometrix ltd., tx1 & RX1 data sheet page 14 variants and ordering information the tx1 transmitter and RX1 receiver are manufactur ed in the following variants as standard: for alarm applications on 173.225mhz: tx1-173.225-10 transmitter RX1-173.225-10 receiver for general applications on 173.250mhz: tx1-173.250-10 transmitter RX1-173.250-10 receiver other variants can be supplied to individual custom er requirements at frequencies from 151.300mhz to 173.250mhz and/or optimised for specific data speed s and formats. however these are subject to minimum order quantity (moq) and long lead time. please con sult the sales department for further information. some of the non-standard frequencies readily availb le. i.e. no moq or long lead time, are as follows: part number: tx1-xxx.xxx-10 and RX1-xxx.xxx-10 (whe re xxx.xxx is the operating frequency) frequency (mhz) type approval note 121.500 - 1, 2, 3 138.125 - 1, 2, 3 149.170 - 1, 2, 3 151.275 - 1, 2, 3 151.300 yes 1, 2 151.775 yes 1, 2 152.175 yes 1, 2 152.500 yes 1, 2 152.575 yes 1, 2 152.650 yes 1, 2 152.850 yes 1, 2 153.8125 yes 1, 2 153.9125 yes 1, 2 153.925 yes 1, 2 154.463 yes 1, 2 155.475 yes 1, 2 155.715 yes 1, 2 155.725 yes 1, 2 156.525 yes 1, 2 157.420 yes 1, 2 159.685 yes 1, 2 159.6875 yes 1, 2 161.975 yes 1, 2 162.025 yes 1, 2 162.975 yes 1, 2 163.000 yes 1, 2 164.525 yes 1, 2 167.420 yes 1, 2 169.435 yes 1, 2 169.41875 yes 1, 2 172.420 yes 1, 2 173.075 yes 1, 2 173.175 yes 1, 2 173.200 yes 1, 2 173.960 yes 1, 2, 3 180.175 - 1, 2, 3 note 1: complies with the etsi standards but not approv ed 2: for specialised application, not for general pur pose e.g: 121.500mhz is an international distress fr equency 3: not a european harmonised frequency. consult loc al radio regulatory authority.
radiometrix ltd., tx1 & RX1 data sheet page 15 type approval the tx1 module is type approved to european harmoni sed standard etsi en 300 220-3 for uk use within the following categories: (a) general applications in the band 173.2-173.35mh z but excluding 173.225mhz. (b) industrial/commercial applications at the same frequencies as category (a). (c) fixed/in-building alarm applications at 173.225 mhz. (d) medical/biological applications (including airb orne use for the tracking of birds) in the band 173 .7- 174.0mhz. requirements for conformance to etsi en 300 220-3: 1. transmitted erp (effective radiated power) must not exceed the limit of 1mw (0dbm) for category (a) or 10mw (+10dbm) for categories (b), (c) and (d). equi pment in category (a) must include a 10db attenuato r between the tx1 rf output pin and the antenna or fe ed, as specified on page 7 of this leaflet. 2. any type of antenna system may be employed provi ded that the applicable erp limit is not exceeded - i.e. transmitting antenna structures which exhibit erp g ain (such as yagis) are not permitted. see pages 10 - 13 of this leaflet for details of suitable antennas . 3. the module must not be modified or used outside its specification limits. 4. the module may only be used to transmit digital or digitised data. speech and/or music are not perm itted. breaching any of these conditions will invalidate t ype approval.
radiometrix ltd., tx1 & RX1 data sheet page 16
radiometrix ltd., tx1 & RX1 data sheet page 17 ce certificate for tx1-151.300-10 and its variants
radiometrix ltd., tx1 & RX1 data sheet page 18 ce certificate for RX1-151.300-10 and its variants
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 o f the directive, as appropriate to the particular equipment. further details are available on the office of comm unications (ofcom) web site: http://www.ofcom.org.uk/ information requests ofcom riverside house 2a southwark bridge road london se1 9ha tel: +44 (0)300 123 3333 or 020 7981 3040 fax: +44 (0)20 7981 3333 information.requests@ofcom.org.uk european communications office (eco) peblingehus nansensgade 19 dk 1366 copenhagen tel. +45 33896300 fax +45 33896330 ero@ero.dk www.ero.dk

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