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 SHX1 500mW Multichannel VHF transceiver Issue 1, 14 May 2014 SHX1 is small multi-channel narrow band VHF transceiver with 500mW RF power output. It is usable for 144MHz band amateur, 151MHz US MURS and European 169MHz band high power applications. Figure 1: SHX1-154-5-12K5-MURS Features Conforms to ETSI EN 300 220-3 and EN 301 489-3 High performance double superhet PLL synthesizer +27dBm (500mW) RF power output Data rates up to 5 kbps for standard module Usable range over 5km Fully screened. Low profile Feature-rich interface (RSSI, analogue and digital baseband) Incorporate a 1200baud modem Re-programmable via RS232 interface Low power requirements Applications Amateur Radio Remote Meter Reading Asset Tracking and Tracing Multi-Use Radio Service (MURS) Technical Summary Operating frequency: Any 3MHz segment in 140 - 175MHz 8 parallel or 255 serial channels Channel spacing: 12.5kHz / 20kHz / 25kHz Transmit power: 500mW (+27dBm) nominal Supply range: +5V regulated Current consumption: 280mA (at 500mW output) transmit, 20mA receive Data bit rate: 5kbps max. (standard module) Receiver sensitivity: -118dBm (for 12 dB SINAD) Size: 67 x 30 x 9mm Evaluation platforms: NBEK + UHX carrier Radiometrix Ltd SHX1 Data Sheet (preliminary) page 1 Figure 2: SHX1 block diagram Radiometrix Ltd SHX1 Data Sheet (preliminary) page 2 Figure 3: SHX1 footprint (Top) view Pin Description Pins RF 1A 2A 3A Normal mode NO PIN RF in/out RF Gnd To the antenna RF ground Modem mode 4A 5A 6A User 1 2 GND GND VCCTX 0V 0V 7 +5V regulated supply for TX TXD TXE 3 4 5 6 7 8 9 10 11 GND Vcc P3 P2 P1 PGM in RSSI RXD AF out DC coupled input for TTL / CMOS logic Transmit enable. Low = TX mode 0V 8 DC supply input (+5V regulated) Parallel channel select Parallel channel select Parallel channel select Serial programming/control input (inverted logic level RS232) DC level between 0.5V and 2.5V. 60dB dynamic range Open collector output of data slicer. 47K pullup to 4V 500mV p-p audio. DC coupled, approx 0.8V bias NC NC BUSY MOD TXD MOD RXD PGM in NC NC NOTES: 1. No inversion occurs between TXD and RXD. However, AF out is inverted relative to TXD. 2. PGM, P0 - P3 (parallel channel selects) and TXE are active LOW and have internal 47K pullups to 4v. 3. Open collector output RXD has a 47K pullup to 4V. 4. The software incorporates a 1200baud dumb modem, compatible with that implemented in other Radiometrix narrowband units ( i1200 tones and format ). Modem operation is selected by a serial command. 5. Main serial port (PGM) operates at 2400 baud. (Command set is the same as SMX (USA) version). The unit is capable of operating in 'basic' parallel channel select only mode, or in serial controlled 'expanded' mode. 6. If analogue transmit modulation is needed, then connect a series 1uF cap + 500K trimmer (a multiturn is advised) in the 'baseband TXD' circuit. Adjust trimmer for 90% of peak deviation (+/2.7kHz) at mean input level. 7. The high current (280mA max.) transmitter supply (5v regulated) is fed to a separate pin, on the RF out connector (pin 6A). The Vcc (pin 4 on the user connector) can tolerate 4.1 - 15v, and draws up to 25mA. Both pins must be supplied at all times (most users connect them to a common +5v supply) Radiometrix Ltd SHX1 Data Sheet (preliminary) page 3 Serial interface commands Serial data is sent to the unit on the programming input (PGM). To successfully program the unit, it must be powered Once 'modem' mode has been selected, the unit locks into serial command mode (and the parallel port pins have other functions) until a SETPAR command returns the unit to ordinary parallel operation. Unlike earlier Radiometrix multichannel units, the SHX1 (like the QPX1 and USA versions of SMX1) has separate N and R registers for each channel, on transmit and on receive. In other words, the frequency of each channel is individually programmed in every mode. Channels 8-255 then constitute a sequential table, starting from channel 7 Functionally, the N value for any 'table' channel is derived by multiplying the STEP value by the (channel number -7) and adding it to the N value programmed for channel 7 (the chan 7 " R value" is used throughout the table). The LOADMX command sets an upper limit for usable channel numbers, beyond which the unit reverts to channel 0 Unless a complex frequency map has been selected, all the R value registers are likely to be programmed with the same value Commands include: Commands Function GOCHAN a empty command buffer LDTXN a nnnnn LDRXN a nnnnn LDTXR a nnnnn LDRXR a nnnnn set value of N for channel a , for transmit set value of N for channel a , for receive set value of R for channel a , for transmit set value of R for channel a , for receive LOADST ss LOADMX aaa SETMOD set per-channel increment step for table (channels 8 and up) set highest valid channel (all channels above this point default to ch0) Enable internal modem. Frequency selected by most recent 'gochan' or 'single' SETPAR SETSER RVALUE rrrrr FORCE nnnnn channel selected by 3 bit parallel input 3 channel selected by most recent 'gochan' operation set R register value used by FORCE command set value of N for single channel operation. N value NOT stored in EEPROM. It is necessary to send a FORCE command with a different value of nnnnn when changing from tx to rx or vice versa. lock transmitter on, sending 250Hz squarewave (nothing overrides this command: you must power-off the unit) process entry clear all buffers disable command mode GOTEST <cr> / # Volatile channel set up: A byte with bit 7 set puts the ls nibble into the high 4 bits of a holding register. A byte with bits 6 and 7 set puts the ls nibble into the low 4 bits of the holding register and the uses this value as a channel number to program the PLL. This function does not work if set to parallel mode. At power-up the unit reverse back to the last E2prom stored GOCHAN value a = single digit channel number from 0 to 7 aaa = channel number from 0 to 255 nnnnn = a synthesizer N register value, (up to 65535) rrrrr = the synthesizer R register value, (up to 16383) ALL COMMANDS MUST BE IN UPPER CASE. For transmit: N = channel frequency / (10MHz / R) For receive: N = (channel frequency - 21.4MHz) / (10MHz / R) 10MHz / R = 25KHz, so R = 400 (usually) Radiometrix Ltd SHX1 Data Sheet (preliminary) page 4 NOTE: • In 'FORCE' mode the unit is inoperative after a power down until either another valid FORCE command is received, or until mode is changed by a GOCHAN, SETPAR or SETSER command. • FORCE mode does not apply any receive frequency offset. • Different values need to be sent when changing from transmit to receive and vice versa. • FORCE is intended mainly for test/diagnostic operation. • A pause of at least 50ms must be allowed between command strings (EEPROM programming time) Modem mode The 'modem' mentioned is a 1200baud RS232 semi-intelligent unit (Transmit keyed when valid serial data is present, so no separate TX control needed. Coding in the datastream also permits the receiver to ignore noise and only output valid serial data) This is a half duplex unit, so collisions between transmitted and received packets must be dealt with by the user If greater modem functionality is needed, then a version (SHZ1) is available which includes a full-function M48A modem device inside the unit, replacing the i1200 functions (case height is increased by 3mm to accommodate the extra circuitry). This "SHZ1" only operates in 'modem' mode (no parallel channel select, no independent transceiver operation) Ordering Information Part No. Application SHX1-144-5 Amateur Radio (e.g. APRS) SHX1-151-5-12k5-MURS Multi-Use Radio Service (MURS) in USA, Canada SHX1-169-5-12K5 SHX1-169-5 Radiometrix Ltd Meter Reading, Asset Tracking and Tracing Channel spacing 25kHz Frequency band (MHz) 144.000 - 146.000 12.5kHz CH0:151.820 – CH4:154.600MHz 12.5kHz CH0:169.40625 – CH15:169.59375 CH16:169.61875CH31:169.806250 CH0:169.412500CH7:169.587500 CH8:169.62500CH15:169.8000 25kHz SHX1 Data Sheet (preliminary) page 5 Condensed specifications (All details are provisional) Frequency Frequency stability Channel spacing Number of channels Supply Receive Transmit: Operating temperature Spurious radiations Any 3MHz segment in 140 - 175MHz (TX and RX frequencies need not be the same) +/-5ppm (better than ±1.5kHz) 12.5kHz / 20kHz / 25kHz (factory set) 8 parallel or 255 serial channels 5.0V regulated at 20mA 5.0V regulated at 280mA for 500mW output ο ο -20 to +70 C (Storage -30 to +70 C) Compliant with ETSI EN 300 220-3 and EN 301 489-3 Interface User RF and TX supply 11 pin 0.1" pitch molex 5 pin 0.1" pitch molex Recommended PCB hole size Size 1.2mm (min.) 67 x 30 x 9mm Transmitter Output power TX on switching time Modulation type TX modulation bandwidth Deviation Adjacent channel TX power TX spurii Inputs +27dBm (500mW) <50 ms FM, FSK (F1D, F3D) DC – 3kHz ±3kHz (±1.5kHz for 12.5kHz channel variant) nominal -37dBm <-40dBm Data (CMOS/TTL compatible) Receiver Sensitivity image / spurious blocking adjacent channel Outputs -118dBm for 12dB SINAD -65dB -86dB -65dB (tested per ETSI EN300 086) RSSI, Audio, Data Radiometrix Ltd SHX1 Data Sheet (preliminary) page 6 Radiometrix Ltd Hartcran House 231 Kenton Lane Harrow, Middlesex HA3 8RP ENGLAND Tel: +44 (0) 20 8909 9595 Fax: +44 (0) 20 8909 2233 [email protected] 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://www.ofcom.org.uk/radiocomms/ifi/ 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 [email protected] European Radiocommunications Office (ERO) Peblingehus Nansensgade 19 DK 1366 Copenhagen Tel. +45 33896300 Fax +45 33896330 [email protected] www.ero.dk