SAT3
5Pages

Catalog excerpts

869MHz Narrow Band FM Transmitter The SAT3 transmitter modules offer a 10mW RF output UHF data link in Radiometrix SIL standard pin-out and footprint. This makes the SAT3 ideally suited to low power applications using narrow band transmitters. Together with the matching SAR3 receiver a one-way radio data link can be achieved over a distance up to 1km+ with suitable choice of data rate and antennas. Features Conforms to EN 300 220-3 and EN 301 489-3 Standard frequency 869.2125MHz 25 kHz channel spacing Data rates up to 4kbps Usable range over 1km+ Fully screened Low power requirements The SAT3 is a narrow band radio transmitter module for use in long range data transfer applications at ranges up to 1kilometre+ Applications Automatic meter reading (AMR) Car and building security Social alarms Industrial telemetry and telecommand In-building environmental monitoring and control EPOS and inventory tracking Technical Summary Size: 32 x 13.5 x 4.5mm Operating frequency: 869.2125MHz Supply range: 5v Current consumption: 45mA Max Data bit rate: 4kbps max. Transmit power: 10dBm (10mW) nominal Evaluation platforms: Universal Evaluation Kit, NBEK + SIL carrier SAT3 transmitter data sheet

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Figure 2: SAT3 Block diagram Functional description The SAT3 transmitter consists of a frequency modulated Voltage Controlled Temperature Controlled Crystal Oscillator (VCTCXO) feeding a frequency multiplier with two stage amplifier and RF filter. Operation can be controlled by the EN (Enable) line, the transmitter achieving full RF output typically within 1.5ms of this line being pulled high. The RF output is filtered to ensure compliance with the appropriate radio regulations and fed to the 50Ω antenna pin. Figure 3: SAT3 pin-out and dimension Function RF Ground 50 RF input from the...

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Absolute maximum ratings Exceeding the values given below may cause permanent damage to the module. Operating temperature Storage temperature Performance specifications (Vcc = 5V / temperature = 25°C unless stated) General DC supply Supply voltage TX Supply current @ 10mW Antenna pin impedance RF centre frequency Channel spacing Number of channels RF RF power output Spurious emissions Adjacent channel TX power Frequency accuracy FM deviation (peak) Baseband Modulation bandwidth @ -3dB TXD input level (logic low) TXD input level (logic high) Dynamic timing TX select to full RF Notes: 1. 2....

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Applications information Power supply requirements The SAT3 has a built-in regulator which delivers a constant 3V to the transmitter frequency control and RF circuitry when the external supply voltage is 3.1V or greater. This ensures constant frequency stability and removes the need for external supply decoupling except in cases where the supply rail is extremely poor (ripple/noise content >0.1Vp-p). TX modulation requirements The module is factory-set to produce the specified FM deviation with a TXD input to pin 14 of 5V amplitude, i.e. 0V “low”, 5V “high (other variants available on...

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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...

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