• Standard frequencies include 169.40625MHz and 169.44375MHz, with options ranging from 120MHz to 180MHz.
• Channel spacing is 12.5 kHz with data rates up to 3kbps.
• Offers a usable range over 10km with low power requirements.

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

• Dimensions: 49 x 34 x 8.7mm, operating frequency: 169.40625MHz.
• Supply range: 5V, current consumption: 75mA TX, 12mA RX.
• Data bit rate: 3kbps max, transmit power: 20dBm (100mW) nominal.
• Double conversion FM superhet with SAW front end filter for >80dB image rejection.
• Sensitivity: -115dBm @ 1ppm BER, RSSI output with 50dB range.

The ENX1 transceiver uses a frequency modulated VCTCXO with a frequency multiplier, two-stage amplifier, and RF filter. The transmitter achieves full RF output within 7ms of the TXRX line being pulled LOW. The receiver uses a SAW filter for high rejection of unwanted signals.

The module includes a pin-out for functions such as Vcc, TXRX, TXD, RSSI, AF output, RXD, and antenna connection. The TXRX pin should not be left floating.

• Operating temperature: -20°C to +60°C, storage temperature: -30°C to +70°C.
• RF in (pin 11): ±50V @ <10MHz, +13dBm @ >10MHz.
• All other pins: -0.3V to +5.5V.

• Transmitter: Supply voltage 4.5-5.5V, TX supply current 75mA, RF power output +19 to +21 dBm.
• Receiver: Supply voltage 4.5-5.5V, supply current 10-15mA, RF sensitivity -118 to -120 dBm for 12dB (S+N/N).

The RSSI measures incoming signal strength over a 50dB range, useful for assessing link quality. The output has a DC bias of 0.6V with no signal, rising to 1.75V at maximum indication.

TX modulation requires a 5V amplitude input. The expected range depends on factors like antenna type, terrain, interference, and data rate. Integral antennas are compact but less efficient, while external antennas offer better performance for long-range links.

Integral antennas include quarter-wave whip, helical, and loop types, each with varying performance and design considerations. External antennas like quarter-wave whip, half-wave dipole, and Yagi offer improved range and are suitable for fixed paths.

Good RF layout practices are recommended. For connections longer than 20mm between the module and antenna, use a 50Ω microstrip line or coax. Filling unused PCB areas with a ground plane is advisable but not mandatory.

• Leave a 1mm gap around the module (PCB footprint area of 25x35mm).
• Use 1.2mm PCB holes or socket strips.
• Keep AF track away from RXD & TXD to avoid cross talk.
• Include a test point on the AF pin for radio checking with a scope.
• Ground plane all unused PCB areas around and under the module.
• Position the module and antenna away from high-speed logic and SMPS.
• Microprocessors with external data/address buses can cause interference.
• Provide LED status lights on TX, RX & CD.
• For complex networks, provide software test routines for continuous RX, continuous TX, loop test, and simple master/slave "ping-pong".

The ENX1 transceiver is available in frequency variants of 169.40625MHz and 169.44375MHz. Other variants can be customized for frequencies from 120MHz to 180MHz. RF output can be factory set from +5dBm (3mW) to +20dBm (100mW) based on minimum order quantity.

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: [email protected], Website: www.radiometrix.com

This data sheet is the copyrighted property of Radiometrix Ltd. Reproduction must acknowledge the copyright owner.

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 or circuits described. Not recommended for life-critical applications.

Products must comply with the R&TTE Directive. Further details are available on the Ofcom website.

Contact Ofcom or the European Radiocommunications Office for more information.