RXM-UHF

Radiometrix Issue 4, 13 July 2001 Hartcran House, Gibbs Couch, Watford, WD19 5EZ, England Tel: +44 (0) 20 8428 1220, Fax: +44 (0) 20 8428 1221 RXM-UHF UHF Radio Telemetry Receiver Module UK Version - RXM-418-10 Euro Version- RXM-433-10 The RXM-UHF radio receiver and the matching DTI approved transmitter (TXM-UHF) are self contained, PCB mounting modules capable of transferring analogue or digital data up to a distance of 200m. Features: • PCB Mounting • 418 MHz SAW controlled wide band FM reception • Selective double conversion superhet • Sensitive typ. 0.35µV for 10dB S/N • High data rates, 10 kbps • Analogue and Digital data outputs • Receive signal strength output • Carrier detect output • Jamming signal detector • Fast enable time. < 5ms for duty cycle power save use • Logic compatible supply (5.0V @ 20 mA) • Antenna Tamper sensing • 433.92MHz version available left: TXM Transmitter right: RXM Receiver These modules are most commonly employed in Wireless Security systems. The transmitter is approved to DTI (RA) specification MPT 1340 thus avoiding the need to submit the finished product for approval. The receiver provides all the outputs necessary to satisfy the requirements of a class 5, BS6799 wireless alarm system. The modules are also suitable for general purpose telemetry/telecommand where their small size and high data rates may be used to advantage. Typical applications include:• Domestic and commercial security • Guard patrol/lone worker protection • Medical Alert/Nurse Call system • Mobile panic attack • Computer networking • Remote industrial process monitoring • Data transfer through hazardous environments • Lighting control, Garage door openers • Fire alarms • Picture/antique protection alarms • Remote control, Access control Radiometrix Ltd, RXM-UHF Data Sheet page 1 Absolute Maximum Rating Supply voltage Vcc, pin 13 RF input, pin 1 Any input or out put pin Operating temperature Storage temperature Performance Data ambient temperature supply voltage test circuit Parameter Operating supply range (Vcc) pin 13 Supply current pin 13 Receive frequency Overall frequency accuracy Sensitivity for 10dB S/N pin 1 Sensitivity for 20dB S/N pin 1 Jam det, threshold pin 1 Carrier det, threshold pin 1 RF input impedance pin 1 IF bandwidth AF output level pin 4 AF bandwidth, -3dB pin 4 Logic low, pin 6,8,10,11 Logic high, pin 6,8,10,11 Antenna tamper detector pin 1 Sig. strength dynamic range pin 9 Sig. strength FSD pin 9 Sig. strength O/P resistance pin 9 enable time pin 11 signal detect time pin 11 20°C +5.0V unless noted otherwise Fig 3 Min 4.5 17 -80 DC 0 4.5 0 20 3.0 6.6 Typical 5.0 21 418 0 0.35 0.7 10 3 50 250 400 0.2 5 30 3.3 6.8 2 1 Max 5.5 27 +80 1.0 2.0 10 0.5 5 5 3.6 7.0 5 3 Units V mA MHz kHz µV µV µV µV Ω kHz mVpp mV/kHz V V kΩ dB V kΩ ms ms Notes -0.3V to +8.0V 0dBm -0.3V to Vcc V, ± 10mA 0°C to +40°C -40°C to 100°C 1 2 2 3 2,3 4 5 6 9 3,7 3,8 notes - 1. Temperature 0°C to 40°C 2. ± 25 kHz deviation, 2 kHz tone 3. 3µ V input 4. The conversion slope is -ve on the 418 MHz version 5. 10mA sink 6. No load, (from 22kΩ internal pullup) 7. From application of supply to carrier detect low 8. From application of signal to carrier detect low 9. For logic high on pin 8 Radiometrix Ltd, RXM-UHF Data Sheet page 2 51 mm 15 16 14 13 12 11 10 3 1 mm 9 8 7 6 5 1 2 4 3 9 mm square 9 mm 3 mm 2.5 mm Fig 1 M echanical detail Holes 1mm diameter on 2.54 mm pitch 1.1 INCH 1.8 INCH Fig 2 P CB mounting detail (top view) Radiometrix Ltd, RXM-UHF Data Sheet page 3 Pin Description pin 1 RF IN The receiver antenna connects to this 50Ω input. A 22 kΩ pull up resistor, internal to the module is used for ‘tamper’ sensing on this pin. This pin should be connected to any ground plane against which the antenna works. It is internally connected to pin 3,14,15 & 16 Ground for supply This is the FM demodulator output. It has an output impedance of 330Ω and a standing DC bias V of approximately CC 2 The voltage on this pin is the peak -ve at pin 4 (AF). A resistor between this in and pin 7 (Max) controls the data slicer’s transient response. This CMOS compatible output from the data slicer is a squared version of the signal on pin 4 (AF). This signal is used to drive external digital decoders, it is true data (ie as fed to the transmitters data input). The voltage on this pin is the peak +ve at pin 4 (AF). This CMOS compatible output goes low if the DC resistance of the antenna exceeds 5kΩ to 0V. Received Signal Strength Indicator. 0V to 3.3V. This CMOS compatible output goes low when a strong greater than a period of time determined by a capacitor on pin 12 (JAM TC) This CMOS compatible output goes low when an incoming signal has sufficient strength to provide a clean decodable signal at pin 6 (DATA). A capacitor between this pin and ground controls the jamming detectors delay time. Positive supply of 5V ± 10%. The supply must be clean, stable (1kΩ) buffer should be used to drive the headphones. The AF Output is DC coupled to the FM demodulator thus the DC level varies with the frequency of the incoming signal and may be used to check frequency shifts / drifts between the transmitter and receiver. Note - the polarity of this signal is different on different frequency versions of the module, check the specific data sheet for polarity. RSSI (Signal Strength) OUTPUT This is also very useful for monitoring the performance of the radio link. It is a 0V to 3.3V signal which increases logarithmically with increasing incoming signal strength. There is an internal 6.8kΩ resistor is series with this output so that a 0.5mA fsd meter may be connected directly to this output for monitoring purposes. In more sophisticated systems this signal may be fed to an A-D converter to automatically monitor the integrity of the radio link. Additional Reading BS 6799 BS 4737 - British Standard for Wire-free intruder alarm systems - British Standard for Intruder alarm systems in buildings from British Standards Institution 0171 629 9000 - DTI type approval specification for 418MHz Telemetry from Department of Trade and Industry 0171 211 0502 or 0171 211 0505 e-mail: library@ra.gtnet.gov.uk - Excellent radio engineering text - Practical antenna design book from Radio Society of Great Britain - 01707 659 015 or 01707 663 279 MPT1340 ARRL HANDBOOK ARRL ANTENNA BOOK Radiometrix Ltd, RXM-UHF Data Sheet page 8 Radiometrix Ltd Hartcran House Gibbs Couch Watford WD19 5EZ ENGLAND Tel: +44 (0)20 8428 1220 Fax: +44 (0)20 8428 1221 info@radiometrix.co.uk www.radiometrix.co.uk 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 Radiocommunications Agency (RA) web site: http://www.radio.gov.uk/topics/conformity/conform-index.htm The Library and Information Service The Radiocommunications Agency Wyndham House 189 Marsh Wall London E14 9SX United Kingdom Tel: +44 (0)20 7211 0502/0505 Fax: +44 (0)20 7211 0507 library@ra.gsi.gov.uk For further information on radio matters contact the Agency's 24 Hour Telephone Enquiry Point: +44 (0)20 7211 0211 European Radiocommunications Office (ERO) Midtermolen 1 DK 2100 Copenhagen Denmark Tel. +45 35250300 Fax +45 35250330 ero@ero.dk www.ero.dk