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 HMT2-458-5 PRELIMINARY Issue 1, 31th March 2016 NBFM Multi-channel 500mW UHF Transmitter The HMT2 transmitter module offers a 500mW RF output in the UK 458MHz. This unit is ideally suited to applications where existing lower powered transmitters provide insufficient range. The HMT2 transmitter is a multi-channel, narrowband design, suitable for licensed and unlicensed UHF allocations. Together with a matching LMR2 receiver a one-way radio data link can be achieved over a distance of well over 5km (with a suitable antenna). Figure 1: HMT2-458-5 Features Conforms to EN 300 220-3 and EN 301 489-3 PLL Synthesized transmitter with TCXO Data rates up to 5 kbps for standard module Usable range over 5km Fully screened User configurable via RS232 interface Low power requirements Applications Handheld terminals On-site paging system (e.g. Nurse call pagers) Heavy vehicle/machine remote controls Data loggers Industrial telemetry and telecommand High-end security and fire alarms Vehicle data up/download Technical Summary Operating frequency: 458.525 - 459.1MHz (standard) or 458.8 - 459.3MHz and 461.3MHz (for paging) 16 parallel / 32 serial select channels Transmit power: +27dBm (500mW) nominal Supply range: +5V regulated (or +6 - +9V for -R version) Current consumption: 350mA transmit, <5µA standby Data bit rate: 5kbps max. (standard module) Size: 66 x 23 x 9 mm Radiometrix Ltd HMT2 Data Sheet page 1 Figure 2: HMT2 block diagram Radiometrix Ltd HMT2 Data Sheet page 2 Figure 3: HMT2 Footprint (Top) view through can User Interface Pin description Pin 1a 2a 3a 4a 5a 6a Name Vcc 0V 0V 0V RF input 0V Function 5v regulated power supply (high current feed) Ground Ground Ground 50Ω RF input from the antenna Ground 1b P0/PGM Channel select LSB / Serial programming (inverted logic level rs232) 2b P1 Channel select 3b P2 Channel select 4b P3 Channel select MSB 5b Vcc 5v input (low current feed) 6b 0V Ground 7b TXE Transmitter enable. Low = ON, open = off. 100K pullup to Vcc 8b TXD DC coupled input for 3V CMOS logic. Rin=47kΩ Notes: 1. Serial programming is by an inverted, cmos logic level, 2400 baud RS232 datastream applied to the P0 pin. 2. Channel select inputs have pullups (50K) to 4v internal rail. Do not exceed 4v logic levels on this port. 3. Channel select inputs are active low 4. TXE has a 100K pullup to Vcc 5. All pins are on an 0.1" grid 6. Pin 1a supplies the power amplifer. This pin requires a clean, well regulated 5v supply at up to 300mA Pin 5b supplies the remainder of the module. It can tolerate 4.1-9v and draws up to 100mA 7. A version of the design is available with an LDO regulator in the PA feed. In this case pin 1a can be supplied from a 6-9v rail too 8. Pinout is compatible with FPX3, SHX1 and UHX1 transceivers, although the case is narrower and the pins associated with receive functionality are absent. Radiometrix Ltd HMT2 Data Sheet page 3 Serial interface commands The internal firmware for HMT2 has two versions. Version 1 is IDENTICAL to our standard LMT2-458-5 (100mW) in all respects Version 2 is specific to paging applications. Version 1: programming instruction 2400 baud RS232. 8 bit data, no parity, 1 start bit, 1 or 2 stop bits. Serial data is sent to the unit on one of the parallel channel select pins (P0). It is very important that the unit does not 'decode' switch bounce in ordinary operation as a command string, or spurious re-writing of the e2prom will result. For this reason the user must send the 16 character string ENABLESERIALMODE (followed by a carriage return) to fully enable the serial command mode before sending any of the command strings listed below. Command mode is disabled on power down, or on reception of a # character. To successfully program the unit, n_txe must be 'low' (active) to enable the unit. GOCHAN aa LOAD aa nnnnn SETPAR SETSER RVALUE rrrr SINGLE nnnnn Serially select channel aa, where aa is ch0 to ch31 Set value of N register for channel aa, where aa is Channels 0 to 31 Channel selected by 4 bit parallel inputs (ch0 to ch15 only) Channel selected by most recent GOCHAN operation Set value for R register Set value of N for single channel operation. N value NOT stored in EEPROM Process entry Clear all buffers Disable command mode <cr> / # aa = a two digit channel number from 00 to 31 nnnnn = synthesizer N register value (up to 65535) rrrr = synthesizer R register value (up to 16383) N= R= Note: f RF f Channelspacing f TCXO f channelspacing = = 458.525 MHz = 18341 25kHz 13MHz , So R=520 25kHz 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. Radiometrix Ltd HMT2 Data Sheet page 4 Version 2: programming instruction The HMT2 provides 32 individually programmable channels (As supplied, CH00-CH20 are programmed to 458.8 - 459.3MHz, and channels 21-31 are all set to 461.3MHz) GOCHAN aa TEMP aa Serially select channel aa, where aa is ch0 to ch31 select channel aa, but revert to last GOCHAN value on next key-up LOAD aa nnnnn RVALUE rrrr Set value of N register for channel aa, where aa is Channels 0 to 31 Set value for R register <cr> / Process entry Clear all buffers aa = a two digit channel number from 00 to 31 (and it MUST be two digits, so use "01" instead of "1".etc) nnnnn = synthesizer N register value (up to 65535) rrrr = synthesizer R register value (up to 16383) N= R= f RF f Channelspacing f TCXO f channelspacing = = 458.800 MHz = 18352 25kHz 13MHz , So R=520 25kHz Notes: 1. A 2400 baud cmos level ‘inverted RS232 format’ (1 start bit, 8 data, 1or 2 stop bits, no parity) is used. 2. The unit echos all bytes sent back on the P3 output. Following any successful operation, the bytes OK <cr> are also sent back, when the unit is ready. 3. To successfully program the unit it must be in active state (txe low), so provision should be made to force the unit into this state while programming (the third pin on the auxiliary programming connector does this). 4. All commands except the non-volatile TEMP aa initiate an e2prom programming sequence. 50mS must be left before the next command is sent. 5. These units employs a sub-set of the programming commands used by standard LMT module. (As the P0 pin is dedicated to serial communication only, the ‘ENABLESERIALMODE’ command string is NOT required.) Radiometrix Ltd HMT2 Data Sheet page 5 Condensed specifications Frequency As supplied: Version 1: 458.525 - 459.1MHz (25kHz steps) Version 2: 458.8 - 459.3MHz (25KHz steps) and 461.3MHz +/- 1.5kHz 25kHz 16 channels controlled by parallel port 32 channels controlled via RS232 interface Frequency stability Channel spacing Number of channels Transmit Output power TX on switching time Modulation type TX modulation bandwidth Adjacent channel TX power TX spuri Spurious radiations Inputs Supply +27dBm (500mW) ±1dB 30 ms from TXE transition FSK (F3D) DC – 3kHz (3v CMOS compatible DATA input) <-37dBm <-36dBm (no output in standby) Compliant with ETSI EN 300 220-3 and EN 301 489-3 data (CMOS/TTL compatible) Voltage Current +5V regulated (or 6-9V in –R version) 350mA nominal transmit <5µA standby (TXE high or floating) User RF 8 pin 0.1" pitch single row header 6 pin 0.1" pitch Interface Recommended PCB hole size Size 1.2mm (min.) 66 x 23 x 9mm Operating temperature Intended approval -20 to +55 C (Storage -30 to +70 C) ETSI Radio standard EN 300 220-3 and EMC standard EN 301 489-3 ο ο Ordering Information: Part No. Notes Frequency band HMT2-458-5 HMT2-460-5 HMT2-458-5-R HMT2-460-5-R version 1 version 2 version 1; regulator version version 2; regulator version 458.525 - 459.1MHz 458.8 - 459.3MHz and 461.3MHz 458.525 - 459.1MHz 458.8 - 459.3MHz and 461.3MHz Matching Receiver LMR2-458-5 (version 1) LMR2-460-5 (version 2) Radiometrix Ltd 458.525 - 459.1MHz 458.8 - 459.3MHz and 461.3MHz HMT2 Data Sheet 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