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| QM Radio Transmitter Module QFMT1-XXX Features * Miniature SIL Package * Unique QM (Quasi AM/FM) Design * Data Rates Up To 10kbits/S * Optimal Range 200m * 433.92 / 868 / 916.5 MHz Versions * Saw Stabilised Quasi AM/FM Transmission * 3 To 9 Volt Supply Voltage * Industry Pin Compatible * Unique Modulation Scheme (High Interference Rejection) * Approved To En 300-220-1 Applications * Vehicle Alarm Systems * Remote Gate Controls * Garage Door Openers * Domestic And Commercial Security Compatible Receiver Modules * QMR1-XXX (see data sheet QMR1) * QFMR2-XXX (see data sheet QFMRX) * QFMR3-XXX (see data sheet QFMRX) * QTRC1-XXX Transceiver (see data sheet QTRC1) General Description The QFMT1-XXX miniature transmitter UHF radio module enables the implementation of a simple telemetry link at data rates of up to 10Kbit/s when used with one of the compatible receiver modules. Available for operation at 433.92, 868 and 916.5 MHz these modules are able to transmit at distances of up to 200m (433.92 MHz version). The QFMT1-XXX module will suit one-to-one and multi-node wireless links in applications including building and car security, remote industrial process monitoring and computer networking. Because of its small size and low power requirements, this modules is ideal for use in portable battery powered wireless applications DS301-2 Oct 02 (c)2000 REG No 277 4001, England. Page 1 QM Radio Transmitter Module QFMT1-XXX Absolute Maximum Ratings: Transmitter Operating temperature: Storage temperature: Supply Voltage (pin 3) Data input (pin 5) RF Out (pin 2) -20C to +55C -40C to +100C 10V 10V 50V @ < 10MHz , +20dBm @ > 10MHz Electrical Characteristics: Transmitter pin DC LEVELS Supply voltage Current & RF POWER 433.92 Supply current @ VCC = 5V (data low/high) RF power @ VCC = 5V 868 Supply current @ VCC = 5V (data low/high) RF power @ VCC = 5V 916.5 Supply current @ VCC = 5V (data low/high) RF power @ VCC = 5V RF & Data 2nd harmonic Harmonics @ > 1GHz Initial frequency accuracy Overall frequency accuracy FM deviation () Modulation bandwidth @ -3dB Modulation distortion (THD) Power up time to full RF Data rate Data pulse width Note 1: measured into a 50 impedance 100 100 3 min. 3.0 Typ. 7.0 max. 9.0 units Volts notes 3 2 0 3/12 +8 mA dBm 1 1 3 2 0 5/16 +3 mA dBm 1 1 3 2 0 5/16 +3 mA dBm 1 1 -50 -46 75 100 10 20 10 20000 dBc dBc KHz KHz KHz KHz % s bits/s s 1 1 DS301-2 Oct 02 (c)2000 REG No 277 4001, England. Page 2 QM Radio Transmitter Module Connection Details General Information QFMT1-XXX Quasar UHF Radio Transmitter The transmitter module implements a unique quasi AM/FM modulation scheme that puts the baseband data signal onto the RF carrier in two different ways. Firstly the carrier is shifted in frequency (typically 20 KHz) which generates the normal FSK spectrum, but simultaneously the RF carrier is also amplified thus yielding the ASK spectrum. 1 2 3 4 5 Figure 1: Transmitter Utilising the quasi AM/FM modulation technique with one of the compatible receivers will yield a highly efficient wireless link. Pin Description: RF GND (pin 1) RF ground pin, internally connected to pin 4 (0V). This pin should ideally be connected to the nearest ground plane (e.g. coax braid, main PCB ground plane etc.) RF OUT (pin2) 50 RF antenna output. To achieve best results the antenna impedance must match that of the module. VCC (pin 3) +Ve supply pin (3.0 to 9.0 volts). The module will generate RF when VCC is present. It is strongly recommended that a 100nF capacitor decouples the supply rail as close as possible to this pin. GND (pin 4) Supply and data ground connection, connected to pin 1. Data IN (pin 5) This input has an impedance of 47K and should ideally be driven by a CMOS logic drive or compatible. The drive circuitry should be supplied with the same supply voltage as the Tx module. Note: Because of the way Quasi Modulation operates the QMR1 and the QFMT1 will not work reliably in close proximity to each other. DS301-2 Oct 02 (c)2000 REG No 277 4001, England. Page 3 QM Radio Transmitter Module Application Information Antenna Design The design and positioning of the antenna is as crucial as the module performance itself in achieving a good wireless system range. The following will assist the designer in maximising system performance. The antenna should be kept as far away from sources of electrical interference as physically possible. If necessary, additional power line decoupling capacitors should be placed close to the module. The antenna `hot end' should be kept clear of any objects, especially any metal as this can severely restrict the efficiency of the antenna to receive power. Any earth planes restricting the radiation path to the antenna will also have the same effect. Best range is achieved with either a straight piece of wire, rod or PCB track @ 1/4 wavelength (15.5cm @ 433.92MHz). Further range may be achieved if the 1/4 wave antenna is placed perpendicular in the middle of a solid earth plane measuring at least 16cm radius. In this case, the antenna should be connected to the module via some 50 ohm characteristic impedance coax QFMT1-XXX Application Circuit For detail application information please see datasheet DS600 Helical Antenna RF 34mm @ 433MHz 17 turns equally spaced = 5mm (inside) Whip Antenna RF 15.5cm @ 433MHz Figure 2: Antenna Configurations To Be Used With The QM Transmitter Module DS301-2 Oct 02 (c)2000 REG No 277 4001, England. Page 4 QM Radio Transmitter Module Mechanical Dimensions QFMT1-XXX 30mm 4mm 11mm Quasar UHF Radio Transmitter pin spacing 2.54mm 1 2 20.32mm 3 4 5 Figure 4: Transmitter Ordering Information Standard Product; Part No QFMT1-434 QFMT1-868 QFMT1-916 Description SIL Transmitter 434MHz SIL Transmitter 868MHz SIL Transmitter 916MHz Should you require further assistance please contact : R F Solutions Ltd., Unit 21, Cliffe Industrial Estate, South Street, Lewes, E. Sussex. BN8 6JL, England Tel: +44 (0)1273 898 000 Email : sales@rfsolutions.co.uk Fax: +44 (0)1273 480 661 http://www.rfsolutions.co.uk 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. DS301-2.doc Oct 00 (c)2000 REG No 277 4001, England. Page 5 |
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