Table of Contents

Wireless Connectivity
The Year In Review

With the skyrocketing cost of wiring and the growing demand for distributed and remote sensing, data acquisition, and control, the role of wireless communications only grows greater. Sensor manufacturers are integrating RF systems in the same enclosure as their sensing devices. Data logger vendors are beginning to turn to wireless communications to enhance their products. And wireless networks are taking their place right next to traditional hardwired configurations.

The industry now offers a broad spectrum of wireless communications hardware and software. But if the Bluetooth standard gains a greater foothold, some real change just may take place.

Here are some of the wireless products that caught our eye during the 12-month period from May 1999 to May 2000.

Radio Modems, Transmitters, and Transceivers

Microwave Radios from Adaptive Broadband

The subrate LEDR family from Adaptive Broadband Corp., Rochester, NY, provides full duplex, scalable bandwidth and capacity from 64–768 Kbps in a 200 kHz channel and is designed to operate in a point-to-point environment and connect to any industry standard EIA-530 or V.35 source. Features include a frequency range of 800–960 MHz, selectable 32 or 16 quadrature amplitude modulation or 16 quadrature phase shift keying, sensitivity better than –101 dBm at 10–6 bit error rate at 64 Kbps, simple network management protocol implementation, 10Base-T Ethernet interface, built-in data service channel, and 8 alarm contacts per radio. Max. data throughput is 64 Kbps for 25 kHz, 128 Kbps for 50 kHz, 256 Kbps for 100 kHz, and 768 Kbps for 200 kHz. The 4.5 by 48 cm radios are suited for telecommunications access and transport links and backhauls and as wireless backbones for SCADA systems. The company is ISO 9001 certified. (716-242-9600, fax 716-242-9620, www.adaptivebroadband.com)

Spread Spectrum Transceiver from Adaptive Broadband

Adaptive Broadband Corp., Roch ester, NY, introduces the MDS 9810, a spread spectrum point-to-multipoint radio specifically designed for telemetry and SCADA applications. The unit operates in half-duplex, simplex (peer-to-peer), and full-duplex (point-to-point) modes and offers RS-232 communications; data rates are 1200, 2400, 4800, 9600, and 19,200 bps asynchronous (also 38,400 bps) and 22.5 Kbps in the RF channel. Features include software-configurable modems, local diagnostics, end-to-end delays <10 ms, max. allowable transmit power of 1 W, forward error correction, sleep mode for solar-powered sites, programmable selection of preferred channels, and deterministic data response for real-time SCADA control. The unit is 5 by 14.3 by 23.5 cm, weighs 1 kg, and has FCC, Industry Canada, UL, UL Hazardous Location, and FM approvals. The company is ISO 9001 certified. (716-242-9600, fax 716-242-9620,www.adaptivebroad band.com)

2.4 GHz Transceivers from AeroComm

The first in the ConnexRF family of 2.4 GHz transceivers, the LX2400 from AeroComm, Inc., Lenexa, KS, is an RF module that uses frequency-hopping spread-spectrum technology for data transmission/reception and includes an integral antenna. Data rates are up to 19.2 Kbps; average current draw is <100 mA; and effective communication distances are up to 500 ft. line of sight or 100 ft. indoors. The 1.65 by 2.65 by 0.2 in. unit stores configuration data in on board EEPROM and supports point-to-point and point-to-multipoint networks and has an asynchronous 5 V TTL serial data I/O interface. One tran sceiver is configured as a server that can have 1 or many client transceivers. Developer kits are available. (800-492-2320, x-203, fax 913-492-1243, trazack@aerocommcom, www.aerocomm.com)

Wireless Transmitters, Receivers from Applied Wireless

Applied Wireless, Camarillo, CA, in tro duces its Long Range line of 900 MHz transmit and receive modules for data transmissions; ranges are up to 1000 ft. with unity gain antennas. Ranges up to 1 mi. are achievable with a high-gain yagi antenna on the receiver. Modules comply with FCC Part 15 unlicensed requirements. The line includes the T900FM (transmitter) and R900FM (receiver) for medium speed data transmission; data rate is 10–200 Kbps. Units are surface mountable, operate from a 3 V supply, and are suited for use in remote control, security, RFID, telemetry, and data transmission applications. (805-383-9600, fax 805-383-9001, info@ applied-wireless.com, www.applied-wire less.com)

Telemetry Transmitter from Aydin Telemetry

The Model ST400QF Series airborne synthesized Feher’s quadrature phase shift keying telemetry transmitter for video and high data rate telemetry, from Aydin Telemetry, Newtown, PA, is designed to operate in aerospace environments. You can control the unit’s frequency range remotely, from 2.2–2.3 GHz in 1 MHz steps (0.5 MHz and 0.25 MHz steps are optional) in a 100 MHz band (200 MHz optional) with a remote binary code or using a frequency selection control translator. Standard output frequency bands are 2200–2400 MHz; output frequency stability is ±0.002%. The rugged, 15 cu. in. unit weighs 18 oz.; the transmitter is available in 2, 5, 8, and 10 W min. power and up to 40 W used in conjunction with the company’s PA220S or PA440S power amplifiers. (215-497-8000, fax 215-968-3214, telemetry@aydin.com, www.aydin.com)

Differential Bus Transceiver from Burr-Brown

Designed for point-to-point or multipoint high-speed data transfer in electrically noisy environments, the ISO422 from Burr-Brown Corp., Tucson, AZ, provides full- or half-duplex communication at up to 2.5 Mbps over long distances. Fieldbus, RS-422, RS-485, and CANbus systems are supported. Features include a continuous isolation rating of 1500 Vrms, a loop-back test capability, and DC correct operation. The transceiver can be used in industrial networks, PLCs, traffic and railroad signaling equipment, gas station pumps, automotive diagnostic equipment, POS terminals, and cellular base stations. Specified over –40°C to 85°C, the unit comes in a 24-pin, single-wide PDIP. (800-548-6132, fax 520-746-7401, www .burr-brown.com)

Wireless Ethernet Modem from EST

Electronic Systems Technology, Inc. (EST), Kennewick, WA, offers the ESTeem Model 192E spread spectrum 2.4 GHz packet burst wireless radio modem to provide a direct interface between Ethernet-capable PLCs and computer networks; typical line-of-sight (LOS) range is up to 3 mi. RF data rate is 1 Mbps; output is 1 W; internal digi-repeating capability lets you route data through a max. of 3 ESTeems to overcome LOS blockages and extend the typical 3 mi. LOS range. The device provides a standard RJ-45 interface for 10Base-T point-to-point or multipoint networks, as well as a standard RS-232 communication port for local and remote programming and network diagnostics. (509-735-9092, fax 509-783-5475, market@ esteemcom, www.esteem.com)

Radio Modem from Johnson Data Telemetry

The T-96SR radio modem from Johnson Data Telemetry Corp., Burnsville, MN, provides data rates of 19200 baud in a 25 kHz channel and 9600 baud in a 12.5 kHz channel. The unit’s radio covers VHF, UHF, and 900 MHz MAS frequency bands. Features include support for the Dataradio Inter-Operability Standard (DI-OS); compatibility with the JDT T-96S, RNet 9600 and 9600S, and Dataradio T-Modem and T-Base base station and repeater; built-in diagnostics; and a 2 yr. warranty. The unit has an FM-approved Nonincendive rating and can operate in Class 1, Div. 2 or Class 1, Zone 2 hazardous locations. (612-890-8155, fax 612-882-5671, www.johnsondata.com)

Radio Modems from Monicor

The MT and MS lines of radio modems from Monicor Electronic Corp., Ft. Lauderdale, FL, operate in the UHF narrow band (450–470 MHz) and transmit data in a local environment, operating in point-to-point network (RS-232) or multidrop (RS-422/485) modes. Network mode lets you connect up to 99 remote radios with a single network controller. Range is 3/4 mi. line-of-sight (typical); transmit/receive frequency stability is better than ±5 ppm; receiver sensitivity is 0.5 µV dB/12 dB SINAD or better; transmitter output power is 120 mW typical; operating temperature range is –30°C to 60°C. Available in port able and fixed configurations, the portable radios’ built-in batteries provide >8 hr. of operation. The radios are used in data collection, industrial scales, crane control, computer cable replacement, and PLCs, among other applications. (954-979-1907, fax 954-979-2611, sales@moni cor.com, www.monicor.com)

Spread Spectrum Data Radio from WWC

World Wireless Communications, Inc., West Valley City, UT, offers the 900 SS hopper 900 MHz data radio that operates in the license-free 900 MHz band and can communicate over distances up to 25 mi., line-of-sight. Used to monitor, control, and test automated manufacturing equipment on the factory floor, the device supports interface data rates from 2400 bps to 57.6 Kbps, multiple network configurations (e.g., point-to-point, point-to-multipoint, client-server, peer-to-peer), and uses Group codes to enable multiple independent networks; radios communicate only within their group. A Windows-based interface application configures the radios. For hostile environments, a NEMA-enclosed version is available. (888-992-9924, fax 801-575-6621)

Diagnostic Tools

Base Station Test System from Agilent Technologies

An over-the-air maintenance tool for testing CDMA base stations, the E7490A from Agilent Technologies, Inc., Palo Alto, CA, allows technicians to drive into a sector, run automated tests from inside their vehicle, and report on whether the base station is operating normally. The device integrates BOAT (base station over-the-air test) software with the company’s digital receiver and platform software for the E7400 series of drive-test systems. PC-based BOAT software monitors active traffic channels in real time, providing over-the-air code domain, channel and pilot power, PN offset number, absolute timing offset, pilot-paging and pilot-sync amplitude delta, estimated rho, frequency error, and peak and avg. power/active traffic channel measurements. (800-452-4844, x-6930, www.agilent.com)

Noise-Figure Analyzers from Agilent Technologies

The NFA series of noise-figure analyzers from Agilent Technologies, Inc., Palo Alto, CA, provides a real-time display of noise figure or gain vs. frequency for RF and microwave device and system characterization; the series consists of the 1.5 GHz entry-level N8972A and the 3.0 GHz N8973A. The N8972A has a 10 MHz to 1.5 GHz frequency range, 0.1 dB noise figure uncertainty, <100 ms typical speed/frequency point, and 4 MHz nominal bandwidth. The N8973A has a 10 MHz to 3 GHz frequency range, 0.05 dB noise figure uncertainty, <50 ms typical speed/frequency point, and selectable 4, 2, or 1 MHz, and 400, 200, or 100 kHz measurement bandwidth. Both devices provide easy measurement setup, built-in data storage, and printer connectivity. (800-452-4844, x-7021, www.agilent.com/find/nf)

CDMA Power Meter from Anritsu

Anritsu Co., Microwave Measurements Div., Morgan Hill, CA, offers the ML2407A (single-channel) and ML2408A (dual-channel) RF power meters, designed to measure signals used in code division multiple access (CDMA) radio systems and by pulsed RF carriers. The units use the company’s MA2469A power sensor that features 1.25 MHz video bandwidth and 0.6 µs rise time. The power meters can measure peak and average power, as well as crest factor parameters on pulsed modulated signals, capturing and displaying pulses down to 1 µs; max. sampling rate is 600 readings/s. A GPIB interface allows you to perform automated measurements; profile mode gives graphical displays of pulsed waveforms. (800-267-4878, fax 972-644-3416, www.anritsu.com)

RF-Enabled Sensing and Data Acquisition

Digital Telemetry Systems from Accumetrics

The miniature, battery-powered AT-5000 TapeOn Series of digital telemetry systems from Accumetrics Associates, Inc., Schenectady, NY, consists of transmitter and battery housing modules that mount on opposing sides of a rotating shaft to maintain balance. Requiring 0.85 in. of radial clearance, the system accommodates strain gauges, load cells, thermocouples, and other measurement sources. Data gathered on the rotor is digitized into 12 bit code before transmission; receivers display engineering units, interface to a computer, or convert measurements back into analog signals. Battery life is as much as 400 hr. (518-393-2200, fax 518-393-3622, www.accumetrix.com)

Telemetry Recorder/Workstation from Astro-Med

Designed for aerospace applications, Everest from Astro-Med, Inc., West Warwick, RI, is a telemetry recorder/workstation that provides 32 analog or digital input channels, an 18 in. color display, a chart printer, and a built-in 250 MB Zip drive. The device has a touchscreen interface; a Virtual Chart feature lets you save an entire test to the standard internal 4 GB hard drive without needing to print; you can record up to 32 waveforms and 32 events at any one time. Everest can record combinations of analog and digital data and accepts IRIG A, B, H, and NASA 36. Digital input is via Ethernet or other optional interfaces; a modem option is available. Applications include flight and missile testing, flight simulation, and satellite telemetry. (877-867-9783, fax 401-822-2430, mtgroup@astro-med.com, www.astro-med.com)

Remote Hygrometer/Thermometer from Control Co.

Control Co., Friendswood, TX, offers the traceable hygrometer/thermometer that receives radio signals from up to 3 different remote wireless sensors; range is 65–100 ft., depending on location or number of walls. RH range is 25%–95% with 1% resolution; switchable thermometer range is –20°C to 60°C and –4°F to 140°F with resolution of 0.1°. Data is transmitted every 30 s; the main unit receives and displays the data and features trend indicators and an alarm that sounds when humidity or temperature is above or below the high and low set points. A NIST-traceable certificate is included. The company is ISO 9001 certified. (281-482-1714, fax 281-482-9448, info@control3.com, www.control3.com)

Wireless Surveillance System from Matco

Matco, Inc., Schaumburg, IL, offers the AS-1004 surveillance system that operates on an FCC-approved 2.4 GHz frequency and has a 300 ft. range (higher using an optional patch antenna); the system can expand to simultaneously monitor up to 4 cameras, holding or skipping channels. Each camera operates on its own separate FM channel and has a built-in 3.6 mm wide-angle lens with 400 TV lines of resolution. The system includes a transmitter, receiver, camera, power adapters, mounting hardware, and color-coded video and audio plugs for monitor or VCR hookup, as well as audio capabilities. (800-719-9605, fax 847-619-0852, info@mat-co.com, www.mat-co.com)

Wireless Pressure Transmitter from Omega

PX921 Series devices from Omega Engineering, Stamford, CT, operate by radio telemetry, sending a low-power RF signal up to 500 m to a receiver/retransmitter where it is converted to a 4–20 mA signal; pressure ranges are from 30 in. Hg. to 0 and from 0–5 psig to 0–15,000 psig. Features include a silicon-on-sapphire sensor, 12 bit accuracy, and a NEMA 4 (IP65) SS body. Typical applications include mechanical and civil engineering projects, process plants, power generation, water resource management, and production test facilities. (800-826-6342, fax 203-359-7700, info@omega .com, www.omega.com)

Explosionproof Controller/Transceiver from Otek

The Model EP955 from Otek Corp., Tucson, AZ, is a wireless transceiver for monitoring or controlling overload situations; a true rms-to-DC converter conditions the output from current or power transformers or provides direct control of high/low comparators. The transceiver operates in the 916.5 MHz band and also provides RS-232 I/O. Frequency response is from DC to 20 kHz. The unit continuously monitors the input signal and compares it to the field-adjustable high and low set points; when a limit is exceeded, it turns on an alarm LED, transmits its address and alarm type to the master, and turns on its open collector transistors. Approval is pending for explosionproof ratings for Class I, Groups B, C, and D; Class II, Groups E, F, and G; Class III Hazardous Locations. UL, CSA, FM, EEx, and CE approvals are also pending. (877-227-6835, fax 520-790-2808, otek corp@primenet.com, www.otekcorp.com)

2-Wire RF Level Transmitter from Princo Instruments

A self-diagnostic level transmitter, the Model L2631-IS from Princo Instruments, Inc., Southampton, PA, is FM approved for use in hazardous locations (used with an appropriate power source with safety barriers). The device uses the company’s Null-Kote circuitry that lets it ignore the buildup of conductive coatings on the sensor element, enabling it to function with proc ess materials ranging from low dielectric substances such as refined oils to conductive slurries and to sticky, viscous materials. Probe and electronics install as a single unit. An explosionproof/weatherproof housing is available for use in Class I, II, III, Div. 1, Groups C, D, E, F, and G/NEMA 4 standard. (800-221-9237, fax 215-355-7766, info@princoinstruments.com, www.prin coinstruments.com)

Tank Monitoring System from Robertshaw

The Centeron Advanced Distribution Management System from Robert shaw Industrial Products Div., Knoxville, TN, allows you to remotely monitor customer tank levels and provide continuous assessment of tank fill priorities; level monitors on each tank transmit readings to a central controller using direct sequence spread spectrum (DSSS) wireless communications. The ultrasonic level monitors have 0.043 in. level resolution and automatically compensate for temperature and aging effects; all level monitors use RF telemetry and are battery-powered. The monitor transmits level information to a DSSS controller, which oversees up to 50 monitors with up to 16 set points each. Sensitivity is –107 dBm; unobstructed range is 1–2 mi.; obstructed range is 500 ft. The controller relays information to the data collector and delivery analysis software suite, allowing you to view images, data, graphics, and scalable maps from a PC; information is accessible via the Internet. (800-643-2110, www.centeron.net)

Radar-Based Level Gauge from Saab Tank Control

TankRadar REX from Saab Tank Control, Houston, TX, meas ures liquid levels in tanks in real time with accuracy of ±0.5 mm using frequency-modulated continuous wave radar technology. Installed on existing flanges or manholes, while the tank is in operation, the level gauge has no moving parts and is not in physical contact with the stored liquid. A 440 mm parabolic antenna transmits a concentrated radar signal for a strong echo and reliable reading, even in liquids with low reflection, such as agitated aromatic hydrocarbons; a drip-off function avoids condensation and contamination. Inputs for temperature and pressure connect directly to the level gauge. The unit communicates via Profibus and Fieldbus or uses a radio modem. (713-722-9199, fax 713-722-9115, saabtank@saab radar.com, www.saabradar.com)

Wireless Personal Alarm from Seaboard Electronics

Available in VHF and UHF units, the PTX-2 long-range personal alarm transmitter from Seaboard Elec tronics, New Rochelle, NY, produces a 2–5 W RF signal that penetrates most concrete and steel buildings. Effective in prisons, institutions, and refineries, the transmitter works with both the PTX/M1A receiver that monitors up to 256 transmitters and the RC-2/RX receiver that monitors up to 8 transmitters. The unit clips to a belt and is manually activated by a push of a button, or is automatically started by a tilt switch. An audio listen-back option activates the unit’s internal microphone, relaying conversation back to the central station. The automatic man-down alarm option sends a signal when the unit tilts more than a set number of degrees. The unit can send 500 messages on 1 set of 9 V batteries. (914-235-8073, fax 914-235-8369, subgra@aol.com, www.angelfire .com/ct/seaboard)

Noncontact Torque Transducer from Sensor Technology

Torqsense from Sensor Technology Ltd., Banbury, England, uses SAW transducers bonded to a shaft to measure its applied torque; signals are then exchanged via an RF couple from the rotating shaft to a fixed pickup, eliminating physical contact between the revolving shaft and its housing. The transducer acts as a frequency-dependent strain gauge that measures the change in resonant frequency caused by induced stresses in the shaft. Frequency of the exciting oscillation is 100–1000 MHz, typical; shaft-produced frequency varies by up to 1 MHz over a typical 1 MHz bandwidth; overall accuracy does not vary by >0.1%. A nonvolatile memory chip in each transducer stores parameter and calibration data. (44 1295 730 746, fax 44 1295 730 746, info@sensors.co .uk, www.sensors.co.uk)

Single-Loop Process Control System from SimPro Controls

The SimLink Control System from SimPro Controls, Milford, NH, provides a single dedicated field controller/process that either can be controlled from your PC or can run autonomously. The system uses single-process field controllers, individually controlled from a PC. The control program provides graphical control of multiple units and can be set up for continuous control of each field controller. Alternatively, control parameters can be downloaded to each controller, which can then operate autonomously. Each controller can control either an electric or pneumatic actuator. A variety of analog and digital inputs are available, as are hardwired or wireless communication options. (603-654-3217, fax 603-654-3218, info@sim procontrols.com, www.simprocontrols .com)

Piston-Mount Telemetry System from SRI/PMD

The ST-363 piston mount transmitter from SRI/PMD, Inc., Melbourne, FL, provides real-time digital telemetry from within operational combustion engines. The miniaturized mold supports instrumentation for up to 16 mixed sensor types for pistons as small as 4 in. dia. The rugged, high-temperature device lets you access and validate such parameters as crown/skirt operational temperatures, inner-ring gas pressures, ring dynamic displacement characteristics, and torque and strain measurements. (407-254-2580, fax 407-254-2492, info@summationresearch.com, www.summationresearch.com)

Wireless DA Platform from ViaSat

ViaSat, Inc., San Diego, CA, introduces the MiniDAT handheld digital device that enables wireless and networked remote DA and comes equipped with a National Instruments DAQCard, a 486-compatible processor, and a PCMCIA COMMCard. A remote MiniDAT samples external sensors and transmits the data over the 2.4 GHz ISM wireless band to a PC base station located at a distance from a few feet to >1 mi. away. The base station interprets the data using LabVIEW or BridgeVIEW and can interface to other software or networks as needed. Communication options include wireless LAN, Ethernet, cellular, and satellite. Features include point-to-point or multipoint protocols; up to sixteen 16 bit analog inputs; up to two 12 bit analog outputs; up to 24 bits of digital I/O; and up to 250 Ksps sample rate. Range, resolution, and sustainable sample rate are dependent on the DAQCard, COMMCard, and antenna configuration. (760-431-3590, x-2089, fax 760-431-3636, minidat@viasat.com,www.viasat .com)

Transmitting Thermometer from WIKA

WIKA Instrument Corp., Law rence ville, GA, offers its Twin-Temp thermometer that provides 1 access point for local and remote temperature readings. The device combines a bimetal thermometer with a thermocouple or RTD. Available in 3 in. and 5 in. back-connected and adjustable-angle configurations, with 1/4 in. stem dia. and 21/2 to 48 in. stem lengths, the thermometer is offered in °F, °C, and dual-scale ranges from –40°F (–40°C) to 500°F (260°C). The company is ISO 9001 certified. (888-945-2872, fax 770-338-5118, info@ wika.com, www.wika.com)

Design Software

Planar EM Simulation Software from Ansoft

A simulation software package for design and simulation of RF and wireless circuit and planar antennas, Ensemble from Ansoft, Pittsburgh, PA, uses the Method of Moments to calculate s-parameters and full-wave fields. You can import structures from the company’s Serenade software, DXF input, or draw them with the modeler. Simulation analyses include s-, y-, and z-parameters, far and near field radiation, surface currents, and bistatic radar cross sections. You can simultaneously use open and closed formulations of Green’s Functions to check your assumptions. (412-261-3200, fax 412-471-9427, info@ansoft.com, www.ansoft.com)

RF, Wireless Design Simulation Software from Ansoft

Symphony, from Ansoft, Pitts burgh, PA, lets you simulate communications systems that consist of RF, microwave, and digital components. Running within the company’s Windows-compliant (95, 98, NT) Serenade Desktop, the software lets you construct a system that includes blocks from its libraries of built-in analog RF and DSP components. Linear and nonlinear system analysis provides outputs such as gain, noise figure, and bit error rate in the time and frequency domains. Features include RF and DSP blocks for time division multiple access, frequency division multiple access, and code division multiple access communications systems and the ability to incorporate data from test equipment and mathematics programs. (412-261-3200, fax 412-471-9427, info@ansoft.com, www.ansoft .com)

Wireless MEMS Design Software from Microcosm

Microcosm Technologies, Inc., Raleigh, NC, offers AutoMM and MemHenry software tools for designing MEMS-enabled wireless products for telecommunication applications. Auto MM for RF lets you extract HDL models that accurately represent wireless MEMS components’ dynamics from layout and 3D device-level descriptions. MemHenry lets you extract HDL models that represent accurate and efficient frequency-dependent RL from 2D and 3D layout or netlist device descriptions. One use for AutoMM for RF is for the design of MEMS varactors; Mem Henry is suited for design of MEMS-based integrated inductors. (919-854-7500, fax 919-854-7501, sales@memcad.com, www.mem cad.com)

OEM Products

Wireless Transceiver from AeroComm

AeroComm, Inc., Lenexa, KS, offers the PKLR2400 miniaturized 2.4 GHz, frequency hopping spread spectrum transceiver for OEMs. The unit features data rates up to 880 Kbps with 115 mA avg. current draw, 25 mA in standby mode, built-in error detection, and programmable packet retries and broadcast attempts. Effective communication distances are up to 3000 ft. line-of-sight with standard low-gain antennas and several miles with high-gain antennas. The transceiver uses 5 V TTL serial data I/O and is 1.65 by 2.65 by 0.2 in. Multiple transmission modes let you configure transceivers for specific applications. Developer kits are available. (800-492-2320, x-203, fax 913-492-1243, trazack@aerocomm.com, www.aerocomm.com)

GSM Radio Chip Set from Analog Devices

Analog Devices, Inc., Norwood, MA, introduces Othello, a global system for mobile communication (GSM) direct conversion radio chip set that converts incoming signals to baseband and enables up to 1000 hr. of standby time for GSM cellular phones. Based on a patent-pending direct conversion architecture, the 2-chip unit consists of the AD6523 transceiver and AD6524 synthesizer and features a virtual intermediate frequency transmit loop. The dual-band receiver features a fully integrated low-noise amplifier and voltage regulator and supports full triple-band (GSM900, DCS1800, and PCS1900) functionality. A Fractional-N synthesizer supports GSM GPRS/ HSCSD multislot data services. (800-262-5643, fax 781-937-1021, www.analog.com)

High-Speed DAC from Burr-Brown

The 12 bit DAC902 from Burr-Brown Corp., Tucson, AZ, provides high-performance, low-power, spurious-free dynamic range for single tone and multitone signals in communication applications. Features include 200 Msps update rate at 5 V, 165 Msps at 3 V; 68 dBc SFDR (20 MHz output at 100 Msps:); 3 pV-s glitch, an internal 1.24 V reference; a supply range of 2.7–5.5 V; and power consumption of 170 mW at 5 V or 45 mW in powerdown mode. Both 3 V and 5 V CMOS logic families can be interfaced to the DAC902. F.S. output current can be adjusted over a span of 2–20 mA with 1 external resistor. The unit is optimized for a variety of communications applications, including transmitters for cellular/paging base stations, wireless local loop, and wireless LANs. (800-548-6132, fax 520-746-7401, www.burr-brown.com)

High-Speed DAC from Burr-Brown

Suited for use in wireless local loops, wireless LANs, fiber-optics, microwave radio links, cellular/paging base station transceivers, and other communication systems, the 14 bit DAC904 from Burr-Brown Corp., Tucson, AZ, has a 2.7–5.5 V supply range, and a 200 Msps update rate at 5 V. Update rate is 165 Msps at 3 V; glitch is 3 pV-s; F.S. output range is adjustable 2–20 mA; SFDR is 20 MHz output at 100 Msps, 67 dBc. The SO-28-packaged DAC has an internal 1.24 V reference; power consumption is 170 mW at 5 V and 45 mW in powerdown mode. Both 3 and 5 V CMOS logic families can be interfaced to the device. (800-548-6132, fax 520-889-1510, www.burr-brown.com)

GPS Board from Magellan

The OEM Falcon GG12 GPS board from Magellan Corp./Ashtech Products Group, Santa Clara, CA, is designed for avionics applications and available in 2 configurations: GPS-only and GPS + GLONASS. The receiver operates in autonomous or differential mode, provides code and carrier data for ground station operation, and features anti-jam capabilities in the RF hardware. The GPS-only configuration receiver meets the CWI specification from RTCA DO-208 and DO-229 and features 12 channels, GPS L1 C/A code and carrier, 5 Hz position update rate (user selectable up to 5 Hz), differential remote RTCA, geoid and magnetic variation models, and 1 PPS timing signal (5V TTL). Horizontal accuracy in autonomous mode is typically 10–30 m for GPS + GLONASS, compared to 50–100 m for GPS-only. Accuracy in differential mode is 40 cm CEP (50%) and 85 cm 95% for GPS + GLONASS, and 45 cm CEP (50%) and 95 cm 95% for GPS-only. (800-922-2401, fax 408-615-5200, oem@ashtech.com, www.ashtech.com)

Spread Spectrum Radio from WWC

The 900 SS MicroHopper from World Wireless Com mun i cations, Inc., West Valley City, UT, is a 21/2 by 13/4 in., frequency hopping spread spectrum digital transceiver, designed for OEMs, that operates in the 902–928 MHz license-free band. The unit supports point-to-point, point-to-multipoint, and multipoint-to-multipoint network configurations, including client-server and peer-to-peer configurations. Interface data rates from 2400 bps to 19.2 Kbps are supported, with an over-the-air rate of 20 Kbps; effective communications distances are up to 5 mi., line of sight. In fully addressable Guaranteed Delivery Mode, the receiver confirms the successful receipt of each data packet and automatically retries until delivery is successful. Windows-based software configures the radios. Developer kits are available. (888-992-9924, fax 801-575-6621) n

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