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FM TRANSMITTER & RECEIVER MODULES. (2ND GENERATION)
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FEATURES
MINIATURE PACKAGE PLUG IN COMPATIBLE WITH FM-TX1 / RX1 EMC CONFORMANT TO ETS 300-683 TYPE APPROVED TO ETS 300-220 DATA RATES TO 40KBIT/S USABLE RANGE TO 300 METRES 418 & 433.92MHZ VERSIONS. SINGLE SUPPLY VOLTAGE 5V OR 3V FULLY SCREENED
FM-TX2-XXX FM-RX2-XXX
Transmitter - TX2
Receiver - RX2
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2 STAGE SAW CONTROLLED, FM MODULATED AT UPTO 40KBIT/S OPERATION FROM 2.2 TO 6 VOLTS 10mW ON 433.92MHZ (EUROPE) , 1mW ON 418MHZ (UK) HIGH EFFICIENCY, >15% , DC --> RF IMPROVED FREQUENCY AND DEVIATION ACCURACY 2ND HARMONIC, < -60DBC
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DOUBLE CONVERSION FM SUPERHET SAW FRONT END FILTER, IMAGE REJECTION 50DB SUPPLY 3.0 TO 6.0 VOLTS @ 13MA 40KBIT/S, -F VERSION , -100 DBM SENSITIVITY @ 1PPM BER 14KBIT/S. -A VERSION , -107 DBm SENSITIVITY @ 1PPM BER LO LEAKAGE, < -60 DBM
Description
The TX2 and RX2 data link modules are a miniature PCB mounting UHF radio transmitter and receiver pair which enable the simple implementation of a data link at upto 40 Kbit/s at distances upto 75 metres in-building and 300 metres open ground. Available for operation at 433.92 MHz in Europe and 418.00 MHz in the U.K., both modules combine full screening with extensive internal filtering to ensure EMC compliance by minimising spurious radiations and susceptibilities. The TX2 and RX2 modules will suit one-to-one and multi-node wireless links in applications including car and building security, EPOS and inventory tracking, remote industrial process monitoring and computer networking. Because of their small size and low power requirements, both modules are ideal for use in portable, battery-powered applications such as hand-held terminals.
DS000022
Rev D
July `99
(c)1999 REG No 277 4001, ENGLAND.
Page 1
FM TRANSMITTER & RECEIVER MODULES. (2ND GENERATION)
FM-TX2-XXX FM-RX2-XXX
Functional description: The TX2 transmitter module is a two stage, SAW controlled FM transmitter operating between 2V and 6V and is available in 433.92MHz and 418.00 MHz versions. The 433.92 MHz unit is type-approved to ETS 300-220 for European use and delivers nominally +9dBm from a 5V supply at 12mA, while the 418.00 MHz unit has MPT 1340 type-approval for U.K. use and delivers -3dBm from a 5V supply at 5mA. Both modules measure 12 x 32 x 3.8 mm. The RX2 module is a double conversion FM superhet receiver capable of handling date rates of upto 40kbit/s. The SIL style RX2 receiver measures 17.5 x 48 x 4.5 mm. It will operate from a supply of 3-6V and draws 14mA when receiving. A fast-acting carrier detect and a power-up enable time of less than 1ms This allows effective duty cycle power saving and a -107 dBm sensitivity. This, combined with a SAW front-end filter results in an excellent RF performance and EMC conformance. TX2 transmitter:
fig. 1: TX2 block diagram
Pin description: RF GND (pin 1) RF ground pin, internally connected to the module screen and pin 4 (0V). This pin should be connected to the RF return path (e.g. coax braid, main PCB ground plane etc.) RF out (pin 2) 50 RF output to the antenna, it is DC isolated internally. (see antenna section of TX2 applications note for suggested antenna/feeds). Vcc (pin 3) +ve supply pin. The module will generate RF when the Vcc supply is present. Max ripple content 0.1VP-P. A 100nF de-coupling ceramic capacitor is suggested. 0V (pin 4) Supply ground connection, connected to pin 1 and screen. TXD (pin 5) This DC coupled modulation input will accept either serial digital data ( 0V to Vcc levels) or high level linear signals. see TX2 applications note for suggested drive methods. Input impedance is 100k.
DS000022
Rev D
July `99
(c)1999 REG No 277 4001, ENGLAND.
Page 2
FM TRANSMITTER & RECEIVER MODULES. (2ND GENERATION)
RX2 receiver:
FM-TX2-XXX FM-RX2-XXX
fig. 3: RX2 block diagram
Pin description RF in (pin 1) 50 RF input from the antenna, it is DC isolate internally. (see antenna section of RX2 applications note for suggested antenna/feeds). RF GND (pin 2) RF ground pin, internally connected to the module screen and pin 4 (0V). This pin should be connected to the RF return path (e.g. coax braid, main PCB ground plane etc.)
fig. 4: physical dimensions
CD (pin 3) The Carrier Detect may be used to drive an external PNP transistor to obtain a logic level carrier detect signal, see test circuit / applications note. If not required it should be connected to pin 5 (Vcc). 0volt (pin 4) Supply ground connection, connected to pin 1 and screen. Vcc (pin 5) +ve supply pin. +3.0V to +6.0V @ <17mA . The supply must be clean < 2mVP-P ripple. A 10F de-coupling capacitor and 10 series resistor is recommended if a clean supply is not available. AF (pin 6) This is a buffered and filtered analogue output from the FM demodulator. It has a standing DC bias of 1.2V and 400mV P-P base band signal. It is useful as a test point or to drive linear decoders. Load impedance should be > 2k and < 100pF. RXD (pin 7) This digital output from the internal data slicer is a squared version of the signal on pin 6 (AF). It may be used to drive external decoders. The data is true data, i.e. as fed to the transmitter. Load impedance should be > 1k and < 1nF
DS000022 Rev D July `99 (c)1999 REG No 277 4001, ENGLAND.
Page 3
FM TRANSMITTER & RECEIVER MODULES. (2ND GENERATION)
Absolute Maximums:
Operating temperature: -10C to +55C Storage temperature : -40C to +100C
FM-TX2-XXX FM-RX2-XXX
TX2, all variants Vcc (pin 3) Data input (pin 5) RF out (pin 2) RX2, all variants Vcc (pin 5) Data , CD & AF (pin 7,3,6) RF input (pin 1) note:
-0.1V to +10.0V -0.1V to +10.0V 50V @ < 10MHz , +20dBm @ > 10MHz -0.1V to +10.0V -0.1V to + Vcc V 50V @ < 10MHz , +13dBm @ > 10MHz
Operation of the TX2 above 6V may cause the module to exceed the licensed power level.
Electrical Performance: TX2 transmitter
pin DC LEVELS supply voltage supply voltage CURRENT & RF POWER TX2-418-3V supply current @ Vcc = 3V RF power @ Vcc = 3V TX2-418-5V supply current @ Vcc = 5V RF power @ Vcc = 5V TX2-433-3V supply current @ Vcc = 3V RF power @ Vcc = 3V TX2-433-5V supply current @ Vcc = 5V RF power @ Vcc = 5V RF 2nd harmonic Harmonics @ > 1GHz initial frequency accuracy overall frequency accuracy FM deviation (+/-) Modulation bandwidth @ -3dB Modulation distortion (THD) power up time to full RF 3 3 min. 2.2 4.0 typ. 3.0 5.0 max. 4.0 6.0 units V V notes -3V version -5V version
3 2
4 -7
6 -3
10 +3
mA dBm
1
3 2
4 -7
6 -3
10 +3
mA dBm
1
3 2
4 0
6 +4
10 +6
mA dBm
1
3 2
7 +6
10 +9
14 +12
mA dBm
1
2 2 -
-30 -70 20 DC -
-65 -50 0 25 5 -
-54 -40 +30 +70 30 20 10 100
dBc dBc kHz kHz kHz kHz % s
1 1
note:
1. Measured into a 50 load.
DS000022
Rev D
July `99
(c)1999 REG No 277 4001, ENGLAND.
Page 4
FM TRANSMITTER & RECEIVER MODULES. (2ND GENERATION)
Electrical Performance: RX2 Receiver
FM-TX2-XXX FM-RX2-XXX
Figures apply to 5V versions unless noted otherwise Vcc = 5.0V, temperature 20C unless noted otherwise
pin DC LEVELS supply voltage, Vcc standard supply voltage, Vcc, 3V version supply current supply ripple data output high, 100A source data output low, 100A sink load capacitance on AF / Data RF RF sensitivity for 10dB (S+N)/N RF sensitivity for 10dB (S+N)/N RF sensitivity for 1ppm BER RF sensitivity for 1ppm BER CD threshold CD threshold IF band width initial frequency accuracy E.M.C. image rejection (2*FIF) spurious responses upto 1GHz LO leakage, conducted LO leakage, radiated AF BASE BAND baseband bandwidth @ -3dB baseband bandwidth @ -3dB AF level DC offset on AF distortion on recovered AF ultimate (S+N)/N DYNAMIC TIMING Power up with signal present power up to valid CD, TPU-CD power up to stable data, TPU-DAT power up to stable data, TPU-DAT Signal applied with supply on signal to valid CD, TSIG-CD signal to stable data, TSIG-DAT signal to stable data, TSIG-DAT 5 5 5 5 7 7 6,7
min. 4.0 3.0 11 -
typ. 5.0 3.5 13 Vcc-0.6 0.4 -
Max. 6.0 4.0 17 2 100
units V V mA mVP-P V V pF
notes
1
1,6 1,6 1,6 1,6 1,3 1,3 1
-30
-113 -107 -107 -100 -107 100 250 0
-107 -100 -100 -93 -97 -90 +30
dBm dBm dBm dBm dBm dBm kHz kHz
-A version -F version -A version -F version -A version -F version
1 1 1 -
-
-50 -70 -65 -70
-
dB dB dBm dBm
2 2
6 6 6 6 6 6
0.006 0.060 0.8 35
450 1.2 0.5 45
7 20 1.6 1 -
kHz kHz mVP-P V % dB
-A version -F version
-
-
1 20 5
-
ms ms ms
-A version -F version
-
-
0.5 15 3
-
ms ms ms
time between data transitions 7 15 0.07 ms 4,-A version time between data transitions 7 1.5 0.025 ms 4,-F version mark:space ratio 20 50 80 % 3 notes: 1. For 6dB (S+N)/N degradation on wanted -100dBm signal 2. Receiver spurious responses are at FRF (nx15.92MHz), n=1,2,3 etc. 3. Average over 30ms (-A), 3ms (-F) at maximum bit rate. 4. Values for 50:50 mark to space (i.e. square wave)
DS000022
Rev D
July `99
(c)1999 REG No 277 4001, ENGLAND.
Page 5
FM TRANSMITTER & RECEIVER MODULES. (2ND GENERATION)
Module test circuits
FM-TX2-XXX FM-RX2-XXX
fig.5: TX2 test circuit
fig.6: RX2 test circuit
The PNP transistor enables a CMOS compatible Carrier Detect signal to be derived from pin 3. If no CD signal required pin 3 should be connected directly to pin 5 (Vcc)
Module mounting considerations The modules may be mounted horizontally or vertically on an area of ground plane preferably close to the antenna to minimise feed length. The receiver and it's antenna should be kept away from sources of interference (micro's, SMPS etc.). The modules may be potted if required in a viscous compound which can not enter the screen can.. Warning: Do NOT wash the modules. They are not hermetically sealed.
DS000022
Rev D
July `99
(c)1999 REG No 277 4001, ENGLAND.
Page 6
FM TRANSMITTER & RECEIVER MODULES. (2ND GENERATION)
Antenna requirements
FM-TX2-XXX FM-RX2-XXX
Three types of integral antenna are recommended and approved for use with the module: Helical Wire coil, connected directly to pin 2, 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 pin 2 at a point 20% from the ground end. Loops have high immunity to proximity de-tuning. This is a wire, rod, PCB track or combination connected directly to pin 2 of the module. Optimum total length is 17cm (1/4 wave @ 418MHz) 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 helical ** ** *** ** 200m loop * * ** *** 100m whip *** *** * * 300m
Loop
Whip
Ultimate performance Easy of design set-up Size Immunity proximity effects Range open ground to similar antenna
(for TX2-433-A & RX2-433-A)
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.
Antenna selection chart
Fig.8: antenna configurations
DS000022
Rev D
July `99
(c)1999 REG No 277 4001, ENGLAND.
Page 7
FM TRANSMITTER & RECEIVER MODULES. (2ND GENERATION)
FM-TX2-XXX FM-RX2-XXX
Type Approval in UK The TX2-418 is type approved in the UK to MPT1340 for use in Telemetry, Telecommand and InBuilding alarm applications. CONFORMANCE to MPT1340 REQUIRES THAT: 1. The transmitting antenna must be one of the 3 variants given in the data sheet. Antenna structures which yield ERP gain are not permitted. 2. The module must be directly and permanently connected to the transmitting antenna without the use of an external feeder. Increasing the RF power level by any means is not permitted. 3. The module must not be modified nor used outside it's specification limits. 4. The module may only be used to send digital or digitised data. Speech and/or music are not permitted. 5. The equipment in which the module is used must carry an inspection mark located on the outside of the equipment and be clearly visible. The minimum dimensions of the inspection mark shall be 10 x 15 mm and the letter and figure height must be no less than 2mm. The wording shall read: RTD: xxxxxx SRD-MPT1340-GB 6. Products intended for UK commercial application must be notified to the Radiocommunications Agency (RA) on form RA 249 ( Cat I), obtainable from the RA's library service, Tel 0171 211 0502 / 0505 OEM Manufacturers incorporating the TX2 as a component part of their product are authorised by Radiometrix Ltd to quote their type-approval provided all the above conditions are complied with. European type approval The TX2-433 & RX2-433 are type approved to ETS 300-220 for European use. CONFORMANCE to ETS 300-220 REQUIRES THAT: 1. The transmitting antenna must be one of the 3 variants given in the data sheet. Antenna structures which yield ERP gain are not permitted. 2. The module must be directly and permanently connected to the transmitting antenna without the use of an external feeder. Increasing the RF power level by any means is not permitted. 3. The module must not be modified nor used outside it's specification limits. 4. The equipment in which the module is used must carry an inspection mark located on the outside of the equipment and be clearly visible. The minimum dimensions of the inspection mark shall be 10 x 15 mm and the letter and figure height must be no less than 2mm. The wording shall read: Radiometrix TX2-433 CEPT-LPD-xx Radiometrix RX2-433 CEPT-LPD-xx
respectiv ely,
OEM Manufacturers incorporating the TX2 & RX2 as a component part of their product are authorised by Radiometrix Ltd to quote our type-approval provided all the above conditions are complied with. Most EEC member countries require notification before your product may be sold. We advise you to contact the relevant country.
DS000022
Rev D
July `99
(c)1999 REG No 277 4001, ENGLAND.
Page 8
FM TRANSMITTER & RECEIVER MODULES. (2ND GENERATION)
Variants and Ordering information The TX2 transmitter and RX2 receiver are manufactured in several variants Frequencies 418.00 MHz for UK use 433.92 MHz for European use ( 4V to 6V TX2 & RX2) ( 3V to 4V for RX2, 2.2V to 4V for TX2)
FM-TX2-XXX FM-RX2-XXX
Supply voltage 5V 3V RX data rate:
-A, 7kHz baseband BW, slow data upto 14kbps -F, 20kHz baseband BW, fast data upto 40kbps
RX data rate applies to receivers only, the TX2 will handle fast or slow data. PART No FM-TX2-418-5V FM-TX2-418-3V FM-TX2-433-5V FM-TX2-433-3V FM-RX2-418A-5V FM-RX2-418F-5V FM-RX2-433A-5V FM-RX2-433F-5V FM-RX2-418A-3V FM-RX2-418F-3V FM-RX2-433A-3V FM-RX2-433F-3V DESCRIPTION Transmitter 418MHz 5 Volt Operation -6dBm Transmitter 418MHz 3 Volt Operation -6dBm Transmitter 433MHz 5 Volt Operation +9dBm Transmitter 433MHz 3 Volt Operation +9dBm Receiver, 418MHz 5 Volt Operation 14kbps Receiver, 418MHz 5 Volt Operation. Fast Version 40kbps Receiver, 433MHz 5 Volt Operation 14kbps Receiver, 433MHz 5 Volt Operation. Fast Version 40kbps Receiver, 418MHz 3 Volt Operation 14kbps Receiver, 418MHz 3 Volt Operation. Fast Version 40kbps Receiver, 433MHz 3 Volt Operation 14kbps Receiver, 433MHz 3 Volt Operation. Fast Version 40kbps
Should you require further assistance, please call; R. F. Solutions Ltd., Unit 21, Cliffe Industrial Estate, South Street, Lewes, E Sussex, BN8 6JL. England. Tel +44 (0)1273 898 000. Fax +44 (0)1273 480 661. Email sales@rfsolutions.co.uk http://www.rfsolutions.co.uk
RF Solutions is a member of the Low Power Radio Association.
RF module data appears courtesy of Radiometrix Ltd, Middlesex, England.
Limitation of Liability The information furnished by RF Solutions Ltd. is believed to be accurate and reliable. RF Solutions Ltd reserves the right to make changes or improvements in the design, specification or manufacture of its sub-assembly products without notice. RF Solutions 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. Radio and EMC Regulations The Intrastat commodity code for all our modules is : 8542 4090. The purchaser of RF Solutions Ltd sub-assemblies must satisfy all relevant EMC and Radio regulations which applies to the finished products in the country of use.
Information contained in this document is believed to be accurate , however no representation or warranty is given and no liability is assumed by R.F. Solutions Ltd. with respect to the accuracy of such information. Use of R.F.Solutions as critical components in life support systems is not authorised except with express written approval from R.F.Solutions Ltd.
DS000022
Rev D
July `99
(c)1999 REG No 277 4001, ENGLAND.
Page 9

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