Wireless transceivers and broadband Internet products supplier Cirronet Inc. has readied new 900 MHz long-range versions of the company's SEM and HopNet transceiver products. With 500 mW transmit power and a receive sensitivity of -104 dBm, Cirronet's 900 MHz products have demonstrated 20-plus mile range using omni-directional antennas with clear line of sight.

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The ability to achieve this range without using directional antennas eliminates the costly and time consuming need to aim the antennas. SEMs, or spread-spectrum Ethernet bridges, provide long-range, high-speed wireless connectivity among Ethernet devices in industrial settings. HopNet devices offer the same performance for serial, Modbus, DNP3 and DF1 devices.

Targeting utility, water management and other industrial applications with their combination of high data rate, long range and available interfaces, the new products enable reliable transmission of data from one location to other facilities at distances of 20 miles or more. The SEM 910 product family, including the SEM 910, SEM910X, SEM910D, SEM910DX, are designed to provide high-speed wireless connectivity between Ethernet devices. The HopNet products, including HN-291, HN-291X, HN-291D, and HN-291DX are low-cost serial and Modbus wireless modems with built in antennas or external antenna connectors that provide high-speed wireless connectivity between serial devices. Typical uses include Ethernet bridging, SCADA networks, PLC networking and other industrial automation or data collection applications.

The new 900 MHz solutions feature the company's patented frequency-hopping spread-spectrum (FHSS) technology. They provide an over-the-air data rate of 172.6 kbps.