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DR9031 Wireless Data Acquisition & Control System Copyright © 2008 Wilkerson Instrument Co., Inc All rights reserved
Two DR9031 Products Make a Bi-directional Acquisition and Control System Send and Receive Data in Both Directions Analog Inputs Available For DC Voltage or DC Current, RTD, or Bridge Four Digital Inputs For Contact Closure or NPN Transistor Status DR9031 POINT-TO-POINT WIRELESS TRANSCEIVER Copyright © 2008 Wilkerson Instrument Co., Inc All rights reserved
DR9031 POINT-TO-POINT WIRELESS TRANSCEIVER Dual DC Voltage or Current Inputs—Individually Isolated Dual Channel DC Inputs Can Have Mixed Inputs 100 Ohm Platinum RTD Input – 2 or 3 Wire Bridge Input – Built In Precision 10VDC Excitation For Four 330 Ohm Bridges Each DR9031 May Have Different Analog Inputs. Copyright © 2008 Wilkerson Instrument Co., Inc All rights reserved
DR9031 POINT-TO-POINT WIRELESS TRANSCEIVER Dual 4-20mA Outputs Dual DC Inputs Have An Output Proportional to Each Input Single Analog Inputs Have Dual 4-20 mA Outputs – Each Proportional to The Single Input Four Optically Isolated NPN Transistor Discrete Outputs Copyright © 2008 Wilkerson Instrument Co., Inc All rights reserved
DR9031 POINT-TO-POINT TRANSCEIVER Frequencies 915 MHz Band 908 or 922 MHz 2.4 GHz Band GHz Spread Spectrum Type Frequency Hopping, Direct FM 7 Hop Sequences Each Frequency Range / Line of Sight 915 MHz Band Up to 20 Mi. 2.4 GHz Band Up to 10 Mi. I/O Data Rate Tx to Rx 9600 bps Data Update Rate 9/Sec RADIO Copyright © 2008 Wilkerson Instrument Co., Inc All rights reserved
Antenna Data Radio frequency currents flowing in an antenna element creates a magnetic field around the conductor. This magnetic field radiates through space and induces a small current in any conductor it passes. The small current created in the receiving antenna of interest is processed by the radio receiver to accomplish the required task. Copyright © 2008 Wilkerson Instrument Co., Inc All rights reserved
Antenna Data Transmit and receive antennas’ elements must be aligned in the same direction Antenna gain is stated as gain relative to a reference antenna Reference “antenna” is a point (isotropic) source which radiates in a perfect sphere Gain is achieved by distorting the perfect sphere to radiate more in a given direction The isotropic antenna is assigned a gain of 1 Practical antennas have their gain referenced to the isotropic source. Copyright © 2008 Wilkerson Instrument Co., Inc All rights reserved
Antenna Data The gain of an antenna, in a given direction, can be defined as “for a given input power, the gain of an antenna is the power radiated by the antenna divided by the power radiated by an isotropic source.” Gain is usually expressed in decibels which is expressed by Gain = 10log (power radiated by antenna) / (power radiated by isotropic source). An i indicates gain relative to an isotropic source (dBi). For a gain of 2 10log(2/1) = 10 X 0.3 = 3dBi For a gain of 10 10log(10/1) = 10 X 1 = 10dBi Antennas are perfectly reciprocal – Gain is the same for transmitting and receiving. Copyright © 2008 Wilkerson Instrument Co., Inc All rights reserve d
915MHz Band Antennas Short Range Antennas Small vertical antennas are used for short range communications 7” vertical antenna for indoor mounting. Mounts by screwing on SMA bulkhead connector. Articulated 90 degree joint allows horizontal or vertical connector to be used. Line of sight range about 1000 to 1500 feet. 2.1dBi gain 2 3/4” vertical antenna for outdoor mounting. Mounts on a special bulkhead connector. A bracket is available for mounting on a flat vertical surface or a mast. Line of sight range about 1000 to 1500 feet. 2.1 dBi gain Vertical omni-directional antenna for outdoor mounting. Type N female connector to accept coaxial cable. Has bracket for mounting on 1 ½” mast. Line of sight range several miles. 6dBi and 8.5dBi gain models. 27” and 60” lengths. Copyright © 2008 Wilkerson Instrument Co., Inc All rights reserved
915MHz Band Antennas Long Range Antennas Yagi antennas with high gain are used for long range communications. 8 dBi gain 18” length 11 dBi gain 21” length 12 dBi gain 26” length 14 dBi gain 48” length 2 Stacked Yagi 17 dBi gain 48” length Copyright © 2008 Wilkerson Instrument Co., Inc All rights reserved
Antenna Beam Patterns Vertical beam pattern of a long range vertical antenna. From the top it appears as a doughnut. From the side it has the radiation pattern shown. Horizontal beam pattern of a yagi antenna. Note the insensitivity from the rear. 8.5dBi gain 52” dBi gain 21” length 4078 Copyright © 2008 Wilkerson Instrument Co., Inc All rights reserved
Need More Information! Wilkerson Instrument Co., Inc Parkway Street Lakeland, FL Toll Free: Phone: Fax: Complete documentation is available for all Wilkerson Instrument Co. products on and Copyright © 2008 Wilkerson Instrument Co., Inc All rights reserved
DR9011/DR9021 Point to Point Wireless Data Acquisition System Copyright © 2008 Wilkerson Instrument Co., Inc All rights reserved.
Wireless Data Acquisition and Control How Antennas Work Copyright © 2008 Wilkerson Instrument Co., Inc All rights reserved 3 Element Yagi Yagi Horizontal.
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