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BiM1

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BiM1

Product catalog summary

Features:

Compliance with EN 300 220-3 and EN 301 489-3 for the 10mW version.
Standard frequency of 151.300MHz, with options ranging from 120MHz to 180MHz.
Available as separate BiM1T transmitter and BiM1R receiver.
Data rates up to 10kbps, with a range exceeding 10km.
Low power requirements and fully screened design.

Applications:

Used in EPOS equipment, barcode scanners, data loggers.
Suitable for industrial telemetry and telecommand.
Applicable for in-building environmental monitoring and control.
Ideal for high-end security and fire alarms, DGPS systems, vehicle data up/download.

Technical Summary:

Dimensions: 33 x 23 x 10mm.
Operating frequency: 151.300MHz.
Supply range: 3.8V - 15V for 100mW Transmitter, 3.0V - 15V for Receiver.
Current consumption: 80mA transmit @ 100mW, 8mA receive.
RSSI output with >60dBm range.

Functional Description:

Transmit section includes a frequency modulated VCXO, frequency doubler, and RF filter.
Receive section is a double conversion FM superhet with IF at 21.4MHz and 455kHz.
RSSI output with 60dB range is provided.

User Interface:

Pin-out includes connections for Vcc, RX select, TX select, TXD, AF, RXD, RSSI.
Recommended PCB hole size: 1.2 mm, module footprint size: 25 x 32 mm.

Absolute Maximum Ratings:

Operating temperature: -10°C to +60°C.
Storage temperature: -30°C to +70°C.
RF in (pin 1): ±50V @ <10MHz, +13dBm @ >10MHz.

Performance Specifications:

Supply voltage for 100mW BiM1T: 3.8 - 15 V.
RF power output for 100mW: +19 to +21 dBm.
RF sensitivity @ 12dB SINAD: -120 dBm.

Applications Information:

Power supply requirements include built-in regulators for constant performance.
TX modulation requires a 3V amplitude input for specified FM deviation.
Output power can be reduced with a 10dB attenuator network.

RSSI:

Measures incoming signal strength over a range of 60dB or more.
Output on pin 11 with a DC bias of up to 0.5V, rising to 2.4V at maximum indication.

Packet Data:

Data is formed into a serial "packet" with preamble, control, address, data, and CRC.
BiM1 can be used in various network configurations, including TDMA networks.

RS232 Serial Data:

Possible to transmit "RS232" serial data directly at 600 to 9600bps baud.
Data must be "packetised" with no gaps between bytes.

Transmission Methods:

Method 1 - Bit Coding: Utilizes Bi-phase or Manchester coding with a bit rate of up to 10kbps and a minimum of 250bps. Differential Manchester Encoding simplifies decoding.
Method 2 - FEC Coding: Involves sending each byte twice, with redundancy per byte at 100%, including parity checks for error detection and correction.

Digitized Analog Data: BiM1 transceivers can transfer analog data directly, but delta modulation is recommended for data in the 1Hz to 4kHz range to minimize distortion. For signals extending to DC, Voltage to Frequency chips are suggested.

Expected Range: Range predictions depend on factors like antenna type, terrain, and interference. Typical ranges vary from 100-200m in buildings to 10-15km in rural areas, depending on data rate and antenna configuration.

Antennas:

Integral Antennas: Include quarter-wave whip, helical, and loop types, each with varying performance and size characteristics. Placement and proximity to conductive objects significantly affect efficiency.
External Antennas: Offer better performance for long-range links. Types include helical, quarter-wave whip, half-wave, and Yagi antennas, each suited for specific applications and environments.

Module Mounting Considerations: Good RF layout practices are essential, with recommendations for using microstrip lines or coax for connections longer than 20mm.

Variants and Ordering Information: The BiM1 transceiver is available in various frequency variants for different applications, with some requiring minimum order quantities and longer lead times.

Type Approval: The BiM1-173 module complies with European harmonized standards for specific frequency bands and applications, including general, industrial, and medical uses.

Requirements for Conformance to ETSI EN 300 220-3:

Transmitted ERP Limits: The effective radiated power (ERP) must not exceed 1mW (0dBm) for category (a) or 10mW (+10dBm) for categories (b), (c), and (d). Category (a) equipment requires a 10dB attenuator between the RF output pin and the antenna.
Antenna System: Any antenna system can be used as long as the ERP limit is not exceeded. Antennas with ERP gain, such as yagis, are not allowed.
Module Specifications: The module must not be modified or used outside its specification limits.
Data Transmission: Only digital or digitized data transmission is allowed. Speech and music are prohibited.
Non-compliance with these conditions will invalidate type approval.

Company Information: Radiometrix Ltd, Hartcran House, 231 Kenton Lane, Harrow, Middlesex, HA3 8RP, England. Contact: Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233, Email: [email protected], Website: www.radiometrix.com

Copyright Notice: This product data sheet is copyrighted by Radiometrix Ltd. Reproduction requires acknowledgment of the copyright owner.

Limitation of Liability: Information is believed accurate but Radiometrix Ltd reserves the right to make changes without notice. No liability is assumed for application or use of products, nor for patent infringements. No warranty is implied, and devices may be subject to interference.

R&TTE Directive: Post 7 April 2001, products must comply with the R&TTE Directive. Compliance details are available on the Ofcom website.

Contact Information: Ofcom, Riverside House, 2a Southwark Bridge Road, London SE1 9HA, Tel: +44 (0)845 456 3000, Email: [email protected]. European Radiocommunications Office (ERO), Peblingehus, Nansensgade 19, DK 1366 Copenhagen, Tel: +45 33896300, Email: [email protected].