Operational Description

FCC ID: NTAXMETER40

Operational Description

Download: PDF
FCCID_635737

Telematics Wireless Proprietary FCC ID:NTAXMETER40 ETMW-SM RF Specification Rev V1 ETMW-SM-V1 Page 0 of 11

Telematics Wireless Proprietary FCC ID:NTAXMETER40 Table Of Content 1. INTRODUCTION .......................................................................................................................... 0 1.1. DEFINITIONS, ABBREVIATION AND ACRONYMS ........................................................................ 0 2. ETMW-SM DESCRIPTION ......................................................................................................... 4 2.1. BLOCK DIAGRAM ...................................................................................................................... 4 2.2. OPERATIONAL MODES............................................................................................................... 0 2.3. BOARD DIMENSION ................................................................................................................... 0 3. ELECTRICAL PERFORMANCE ............................................................................................... 0 3.1. TRANSMIT UNIT ........................................................................................................................ 0 3.1.1. FSK Mode......................................................................................................................... 0 3.1.2. PSK Mode......................................................................................................................... 0 3.1.3. Tx Timing ......................................................................................................................... 0 3.2. RECEIVE UNIT ........................................................................................................................... 9 3.2.1. Receive Parameters........................................................................................................... 9 3.3. ANTENNA .................................................................................................................................. 9 3.4. POWER SOURCE ......................................................................................................................... 9 3.5. ENVIRONMENTAL CONDITIONS ................................................................................................. 9 ETMW-SM-V1 Page 0 of 11

Telematics Wireless Proprietary FCC ID:NTAXMETER40 1. Introduction The following document describes the technical specification of the second generation of Water Meter transceiver board (called ETMW-SM) for the USA market. The ETMW-SM is actually a water odometer, offering Automatic Meter Reading – AMR. The ETMW-SM is 2-Way RF communicator built-in water meter. The RF capabilities enable the transmission of the meter reading and some extra information to a Collecting unit. In addition specific parameters can be programmed via the RF link. The ETMW-SM operates at the 900MHz ISM band. The board consists of the following units: RF Transmitter & Receiver with integral Antenna and a Microcontroller (plus simple Digital Logic), which control the operational modes of the unit. 1.1. Definitions, Abbreviation and Acronyms RFD : RF Dialog ETMW-SM-V1 Page 0 of 11

Telematics Wireless Proprietary FCC ID:NTAXMETER40 2. ETMW-SM Description 2.1. Block Diagram A block diagram of the ETMW-SM is described below. Battery 1.5F 2.7 - 3.6V Rx Control Antenna IR RF Interface RxD Receiver LO 927.2 MHz 916.468 MHz Digital Micro Control Controller Logic Step Motor RF Interface Transmitter TxD 905.43 MHz - 923.55 MHz Tx Control Clock Clock Generator Generator 32768 Hz 14.487 MHz Figure 1: ETMW-SM Block Diagram ETMW-SM-V1 Page 0 of 11

Telematics Wireless Proprietary FCC ID:NTAXMETER40 2.2. Operational Modes Table 1 – Operational Modes Mode Microcontroller IR Stepping Motor Digital RF RF Interface Interface Logic Receiver Transmitter Transmit On (fast clock) Off Off On Off On Receive On (fast clock) Off Off On On Off Stepping Motor On (fast clock) Off On Off Off Off IR On (fast clock) On Off Off Off Off Idle/Sleep On (32768Hz clock) Off Off Off Off Off 2.3. Board Dimension Figure 2: Board Dimension ETMW-SM-V1 Page 0 of 11

Telematics Wireless Proprietary FCC ID:NTAXMETER40 3. Electrical Performance 3.1. Transmit Unit Each ETMW-SM board has two transmit modes: • FSK (see table 2) • PSK (see table 3) The transmit mode is is controlled by the software. 3.1.1. FSK Mode Table 2 – FSK Transmit Parameters Parameter Value Transmit Frequency Programmable in the range 905.43 MHz - 923.55 MHz Modulation Digital Modulation – Wide Band BFSK Modulation Coding Manchester Bit rate (net data rate) 60.3625 kbps Frequency deviation 190 kHz Bandwidth (@6dB) 500 kHz – 850 kHz Frequency stability (including initial <12 ppm stability, temperature and aging) Peak Output power (without Antenna) < 16 dBm Peak Output power spectral density 3 dBm to 8 dBm (without Antenna) in any 3kHz Harmonics < - 54dBm Tx Pulse duration ~4 ms Transmission duty cycle Programmable. Less than 0.10% ETMW-SM-V1 Page 0 of 11

Telematics Wireless Proprietary FCC ID:NTAXMETER40 3.1.2. PSK Mode Table 3 – PSK Transmit Parameters Parameter Value Transmit Frequency Programmable in the range 905.43 MHz - 923.55 MHz Modulation DSSS BPSK Bit rate 60.3625 kbps Chip rate 905.4375 kChip/sec Bandwidth (@6dB) 700 kHz – 1300 kHz Frequency stability (including initial <12 ppm stability, temperature and aging) Output power (without Antenna) < 20 dBm Output power spectral density (without 2 dBm to 8 dBm Antenna) in any 3kHz Harmonics < - 54dBm Tx Pulse duration ~3.4 ms Transmission duty cycle Programmable. Less than 0.10% ETMW-SM-V1 Page 0 of 11

Telematics Wireless Proprietary FCC ID:NTAXMETER40 3.1.3. Tx Timing ~0.2ms ~3.4 - 4ms 0.1ms Synthesizer + TCXO On PA On Tx Data Preamble Tx Frame ETMW-SM-V1 Page 0 of 11

Telematics Wireless Proprietary FCC ID:NTAXMETER40 3.2. Receive Unit 3.2.1. Receive Parameters Table 6 – Receive Parameters Parameter Value Receive frequency 916.468 MHz Sensitivity (BER 1E-3) -90 dBm Modulation FSK Frequency deviation 190 kHz Bit rate 41.156 kbps Coding Manchester ETMW-SM-V1 Page 0 of 11

Telematics Wireless Proprietary FCC ID:NTAXMETER40 3.3. Antenna The ETMW-SM has an integral Antenna (kind of Inverted Antenna). The Antenna is Omni Directional in horizontal plane. The max gain is 2dBi. 3.4. Power Source Battery rated voltage 3.6V. Operating voltage: 2.7-3.6V ETMW-SM-V1 Page 0 of 11

Telematics Wireless Proprietary FCC ID:NTAXMETER40 3.5. Environmental Conditions Operating Temperature: -40° C to + 85° C Storage Temperature: -40° C to +85° C Humidity: Up to 95% ETMW-SM-V1 Page 0 of 11


Document Created: 2006-02-28 15:13:10
Document Modified: 2006-02-28 15:13:10
© 2024 FCC.report
This site is not affiliated with or endorsed by the FCC