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Technical content

Features

 Conforms to EN 300 220-2 and EN 301 489-3  High performance double superhet, 255 channel PLL Synthesizer with VCTCXO  Data rates up to 5 kbps for standard module  Fast TX switching time (5ms typ.)  Usable range over 5km (@ 500mW)  Fully screened  Feature-rich interface (RSSI, automatic noise squelch, analogue and digital baseband)  User configurable via RS232 interface

Applications

 Handheld terminals  Heavy vehicle/machine remote controls  EPOS equipment, barcode scanners  Data loggers  Industrial telemetry and telecommand  In-building environmental monitoring and control  High-end security and fire alarms  Vehicle data up/download Technical Summary  Operating frequency: 458.5-459.1MHz UK (23 channels)  Up to 255 channels (8 parallel selected).  Transmit power: +27dBm nominal (adjustable 100 - 500mW)  Supply range: 6V – 15V DC (10% transmit duty cycle), 6V - 9V DC (Continuous Transmission)  Current consumption: 350mA transmit, 35mA receive  Data bit rate: 5kbps max. (standard module)  Receiver sensitivity: -118dBm (for 12 dB SINAD)  Size: 59 x 39 x 15mm Evaluation platforms: NBEK + yy2M Series carrier The SFX2 transceiver module offers a 500mW RF powe r output in the UK 458MHz band. This makes the SFX 2 ideally suited to those low power applications wher e existing multi-channel narrow band devices like TR2 M have insufficient range. Figure 1: SFX2-458-5 transceiver 500mW NBFM Multi-channel UHF Transceiver Hartcran House, 231 Kenton Lane, Harrow, Middlesex, HA3 8RP, England Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233, www.radiometrix.com Issue 2, 09 October 2017SFX2

Radiometrix Ltd SFX2 Data Sheet page 2 Figure 2: SFX2 block diagram

Radiometrix Ltd SFX2 Data Sheet page 3 Figure 3: SFX2 Footprint (Top) view Pin Description - SFX2 Pins Name Function A1 Vcc 6V - 15V A2 GND Ground B1 RF GND RF ground B2 RF To the antenna B3 RF GND RF ground C1 TXE Transmitter Enable. Low = ON, Open = RX mode. Internal 10k pull-up to 5V C2 TXD DC coupled digital data input fo r 3-12V CMOS logic. Leave open if unused C3 AF in 50mV-2.5V pk-pk AC coupled variable gain input. Factory set to 1Vpk-pk C4 RSSI DC level between 0.5V and 2.5V. 60dB dynamic range C5 SQF Noise operated carrier detect. Open collector. ON/low = no signal C6 AF out 200mV pk-pk audio. DC coupled, approx 1V bias. Muted by squelch C7 RXD Open collector output of data slicer suitable for Biphase codes C8 +5V out Regulated DC supply. 100mA max. drain. Present if unit is powered C9 0V Ground C10 PGM Serial programming/configuration input at RS232 level C11 P1 C12 P2 C13 P3 Parallel frequency select inputs. Inverted logic, internal 50k pullups to 5V Notes: 1. By changing specific links and components, either t he rx and/or the tx path can be made to invert the sense of the baseband waveform, or not. Standard issue SFX2 inverts on both tx and rx paths (so is equivalent to a TR2I-458-5) 2. Carrier detect mutes the AF and DATA outputs. It can be disabled by either rotating the level set trimmer fully ACW (disabling both) or by removing the solder link (which disables only the AF mute). The carrier detect is relatively slow (approx 25mS) so is not compatible with the full sub 10mS tx/rx switching speed capability of the unit 3. There is no pullup on the SQF open collector output. RXD has 47K to internal 5v 4. Unlike the parent TR2M, the SFX2 does not incorporate an i1200 modem 5. RS232 input (pin 10) tolerates true +/- levels. No buffering is required.

Radiometrix Ltd SFX2 Data Sheet page 4 Channel mapping The SFX2 has a 255 channel capacity. The first 32 channels are individually programmable (they have their own N register stores). The remaining channels (32-255) constitute a sequential table In serial mode the channel is selected by a GOCHAN xxx command In parallel mode the lowest 8 channels are selected by the state of P1, P2, P3 SFX2 serial configuration commands 2400 baud RS232. 8 bit data, no parity, 1 start bit, 1 or 2 stop bits, No flow control SINGLE nnnnn Set value of N for single channel operation. N value NOT stored in EEPROM GOCHAN xxx Serial select of channel aaa (ch0 to 255), store to EEPROM GOTEMP xxx Volatile version of GOCHAN LOAD aa nnnnn Set value of N for channel aa (channels 0 to 31) LOADTB nnnnn Set value of N for channel 32 (channels 32 to 255 then in sequence) LOADMX aaa Set highest permitted (serial sele cted) channel xxx (others default to ch0) RVALUE rrrr Set value for R register INCREM i Set increment value for sequential table (0-7) SETPAR Channel selected by 3 bit parallel input (ch0 to 7 only) (Disable LOCKSM command) SETSER Channel selected by most recent 'gochan' operation DUMPEE Output entire EEPROM contents (128 unfor matted bytes) using the P3 pin as an output <cr> Process entry / Clear all buffers xxx = channel number from 0 to 255 aa = a two digit channel number from 00 to 31 nnnnn = a synthesizer N register value, (up to 65535) rrrr = the synthesizer R register value, (up to 16383) i = sequential table step value (0-7) 1748525 4.21525.458 MHzMHz kHz MHzfN RF )(52025 13 usuallykHz MHz f fR frequencycomparison TCXO  Notes: 1. A pause of at least 50ms must be allowed between command strings (EEPROM programming time) SINGLE mode does not store the N value in EEPROM. Therefore the unit is inoperative after a power down until either another valid SINGLE command is received, or mode is changed by a GOCHAN, SETPAR or SETSER command. SINGLE mode is intended for frequency agile applications. 2. /SETPAR command should be issued at the end of channel programming to put the module back into parallel frequency select mode 3. In 458MHz band, channel 12 (458.825MHz) and channel 15 (458.900MHz) are allocated specifically for fixed alarm and radio keys/vehicle paging applications respectively and should not be used for general purpose applications. 4. User can modify the frequency table of 128 channels to any desired frequency by changing N, R values of synthesizer within 2.5MHz of factory set Channel 0 frequency subject to the Radio Regulatory Band Allocation in the country of intended use. 5. All other frequency, power, analogue input gain and automatic noise squelching adjustment will be treated as custom variants of the module to be set by factory.

Radiometrix Ltd SFX2 Data Sheet page 5 Condensed specifications Frequency 458.5 - 459.1MHz (in UK allocation) as standard Other UHF frequencies available on request Frequency stability +/- 1.5kHz Channel spacing 25kHz (12.5kHz by special order) Number of channels 255 channels controlled via RS232 interface (8 parallel selected) Supply voltage 6v - 9v (100% duty cycle) 6v - 15v (10% duty cycle) 5v regulated only version available Current 350mA nominal transmit 35mA receive Operating temperature -20 οC to +70οC (Storage -30οC to +85οC) Size 59 x 39 x 15 mm Spurious radiations Compliant wi th ETSI EN 300 220-2 and EN 301 489-3 Interface user 13pin 0.1" pitch molex Power 2pin 0.1" pitch molex RF 3pin 0.1" pitch molex Recommended PCB hole size 1.2mm (min.) Intended approval ETSI Radio standard EN 300 220-2 and EMC standard EN 301 489-3 Transmitter Output power +27dBm (500mW) ±1dB (factory adjustable 100 - 500mW) TX on switching time 5 ms nominal (sub 10ms guaranteed) Modulation type FM, FSK (F1D, F3D) Deviation  3kHz TX modulation bandwidth DC – 3kHz Adjacent channel TX power <-37dBm (<200nW) Inputs analogue, data (CMOS/TTL compatible) Spurious radiations Compliant wi th ETSI EN 300 220-2 and EN 301 489-3 Receiver Sensitivity -118dBm for 12 dB SINAD adjacent channel 65dB image / spurious >70dB blocking 85dB or better Outputs RSSI, carrier detect, audio, data SFX2 timing TXE low to TX full power 5ms TXE high to valid data on RXD 5ms RSSI attack/delay time <20ms Carrier Detect response approx. 20 – 30ms (25ms typical)

Ordering information

Part No. Variant Description SFX2-458-5 5V regulator VCC=6V-15V SFX2-458-5-5V Non Regulator VCC=5V externally regulated SFX2-458-5-NM No Mute No Muting / Squelchi ng of AF output when RF level is below –123dBm SFX2-458-G GMSK To be used with external 9600 baud GMSK modem SFX2-458-5-12k5 12.5kHz channel 12. 5kHz channel spacing Narrow Band SFX2-458-5-RI TR2M compatible Receiv ed Data RXD output Inverted like TR2M SFX2-458-5-TI TR2I compatible Transmi t Data TXD input inverted like TR2I SFX2-458-5-100mW 100mW RF Power Transmit Power reduced to +20dBm (100mW) like TR2I/TR2M

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 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 The Office of Communications (Ofcom) web site: http://stakeholders.ofcom.org.uk/spectrum/technical/rtte/ Information Requests Ofcom Riverside House 2a Southwark Bridge Road London SE1 9HA Tel: +44 (0)845 456 3000 or 020 7981 3040 Fax: +44 (0)20 7783 4033 information.requests@ofcom.org.uk European Radiocommunications Office (ERO) Peblingehus Nansensgade 19 DK 1366 Copenhagen Tel. +45 33896300 Fax +45 33896330 ero@ero.dk www.ero.dk