We have provided many different consulting services for our clients. Below are some of the older archived projects we have worked on. This information is enclosed to provide you with a sampling of our broad base of experience and capabilities, but does not include all our capabilities. If you have any questions, please contact us and let us discuss how we can help you and your company.
R. A. Wood Associates has been awarded a contract from Naval Surface Warfare Center (NSWC), Crane Division. The contract involves designing and delivering an automated test rack consisting of:
We are fortunate to be able to work with Viewpoint Systems on this contract.
This contract was won on a competitive bid, and our solution was selected out of many other submissions. We are very excited about the opportunity to work with NSWC Crane Division!
Using our Extreme BW RF amplifiers, we designed, built, and tested 7 LB RF amplifier modules for one of our customers. Our customer's original vendor failed to deliver their amplifier products and meet the requirements. So we stepped in and helped them meet their delivery schedules. These modules were made to "drop in" to our customer's modules.
These modules will be used in our customer's systems, which will be installed on board Navy vessels.
A full set of test data was provided for each LB RF Amplifier Module delivered. Our automated RF test software (RFSpecTest and Painless Extraction) helped to quickly capture the test results and create the test reports.
We've enhanced our portfolio of equalizer designs with new high frequency equalizers, with low losses all the way up to 18 GHz!
We also now have a smaller package design (M02 package).
We can now offer low loss, high linearity equalizers over the following frequency bands:
R. A. Wood Associates designed, built, tested, and delivered 2 Electronics Support Switching Units (ESSU) to one of our customers. This was another set of hardware slated to to be installed on a Navy Vessel. The ESSU was designed to be installed between the front end (Antennas, RF amplification switching, filtering) and back end (RF processing) of a complex RF/Microwave system. The purpose of the ESSU was to allow a second front end (RF Subsystem 2) to be switched into the same back end, to make use of the RF signal processing in the back end.Some of the major components in the ESSU are as follows:
We've taken a challenge and come out on top again! We've developed an Extreme BW RF Amplifier, providing ~22 dB gain, and high dynamic range (~36 dBm Third Order Output Intercept Point) over the frequency band of 5 KHz to 2 GHz. An integrated RF package of 1.9" L X 1.3" W X 0.4" H was developed for the Extreme BW RF Amplifier and also included:
The input Equalizer and output Power Divider can be "zeroed out" if not needed. The input Equalizer can be used to compensate for the amplifier slope and/or passive loss slopes. We can provide a variety of RF slopes in the input Equalizer. More information is available from our Extreme BW RF Amplifier page. Let us know if you are interested in this product line! Bob Wood.
R. A. Wood Associates designed, built and tested and delivered 2 "JBU RF PLate" Assemblies. These RF assemblies were used to provide wideband gain, equalization, and Built-in-test (BIT) injection between two very long RF cable runs (between an Antenna Assembly and below decks receivers). The gain and equalization was needed to preserve the RF path noise figure and dynamic range performance through the long cable run.
The exciting part for us is that this design will actually be deployed on a US Naval vessel. This is our first of several LRU's that were designed to be used on a US Naval vessel.
Greetings! We've been very busy working on creating a new series of RF/microwave products: "Equalizers on Demand". "Equalizers on Demand" are wideband, low loss frequency equalizers made to provide a positive gain slope from the lower frequency to the upper frequency. These equalizers are designed to flatten out slope caused by long cables or other passive losses, or amplifier negative gain slopes. We have developed a wide series of equalizers with various slopes covering the following frequency bands:
Equalizers are very important to help your system obtain the best dynamic range performance. You can use them to flatten out a negative gain slope to reduce gain tolerances/differences before going into high dynamic range amplifiers.
We're hoping this series of products create a new paradigm in RF performance. We can provide these very quickly to help correct slope in an RF path, "Equalizers on Demand" can trim RF path slopes almost as easily as attenuators can be used to adjust nominal gains.
These products were developed internally to fill a void in the RF industry. It's very difficult to quickly order a fixed slope equalizer to correct an excessive sloped RF path without waiting 10-12 weeks for delivery. Our losses at the high frequency are the lowest available in the industry. We've searched far and wide to find products with the characteristics of our products, but could not find vendors to supply them. So we bit the bullet (many bullets) and worked on these designs ourselves.
We've worked very hard to make these products easily producible. We can deliver these very quickly (typically 2-4 weeks). If you pre-order an equalizer in a certain frequency band, and then let us know what slope you need, we can most likely incorporate the slope and deliver a tested equalizer within 1-2 weeks.
For more information for the current products and designs available, please visit our "Equalizers on Demand" product page.
We hope we can help improve your RF/Microwave system performance with these products! Bob Wood
We just delivered our latest product: a multi-channel RF/Microwave Receiver Simulator. This device simulates the RF front end of an ESM (Electronic Support Measures) system. The simulator matched the noise figure, gain and dynamic range of the RF front end. The simulator contained 9 channels of RF bands covering from 10 MHz all the way up to 40 GHz.
Some pictures of the RF Receiver Simulator are shown below. The RF Receiver Simulator is a 3U rack-mounted assembly mounted in a protective roll-away cart for ease of transportability.
'We just delivered an EW Receiver Simulator to one of our customers. The simulator provided the simulated RF and microwave front end performance of an EW (Early Warning) Receiver subsystem. Our simulator allows the EW Receiver/Processor to be evaluated without requiring the actual front end system. The simulator was designed to match the system front end noise figure, gain, and dynamic range. This also represents a new modular and mechanical design for us.
A block diagram of one channel of the EW Receiver Simulator is shown below:
Some pictures of the EW Receiver Simulator are shown below. The box is built to be used as bench-top equipment or as a 3U rack-mount installation. This is the first design of our standard rack-mount chassis, capable of supporting up to 16 plug-in modules (1 inch standard width). Cooling air is pulled from front to back, and the modules are thermally clamped (with Calmark Clamps) to the top and bottom of the chassis.
On September 15 2006, R. A. Wood Associates delivered the first two of 15 complete Integrated RF Test Racks. The Integrated RF Test Rack provided a complete solution for complete automated testing of 7 RF/Digital modules. All equipment was controlled through GPIB interfaces. All automated test software was written in National Instruments LabVIEW by R. A. Wood Associates. RFSpecTest was used in "script" mode to perform most of the RF measurements. The rack consisted of:
The full rack was designed to be a comfortable testing environment, as well as easy to maintain. Equipment is easy to remove if needed with minimal interference to other equipment.
|We designed and developed a Computer Automated RF Test Station for one of our customers. The Computer Automated RF Test Station is capable of testing 7 different RF and RF/digital modules, but is flexible enough to test many possible RF modules. The Test Stations were built and tested at R. A. Wood Associates. Computer automated test software was also developed to test the 7 different modules using LabVIEW. RFSpecTest was used in a "scripted" mode to perform all RF tests. More information about the Computer Automated RF Test Station is available at this link.|
|We delivered a wideband RF/microwave Receiver Simulator to one of our clients on March 1. The simulator was designed to simulate the front end of an RF/Microwave system. Frequency coverage went from HF to SHF Ka Band. The simulator was required to have very low noise figures and very high intercept points/compression points. The unit was delivered in 6 months after order. More information is available at this link location.|
R. A. Wood Associates demonstrated our RFSpecTest software product at MTT Symposium in Philadelphia, PA during June 10-12, 2003. See our Press Release for more info.
R. A. Wood Associates introduced their latest computer automated RF test software suite, RFSpecTest, at National Instruments (NI) Week, August 13-16. See Press release. The test software suite is centered around NI's latest RF product, the NI 5660 Spectrum Analyzer. Automated testing for gain, two tone intermodulation products, gain compression, relative measurements, and others was demonstrated for amplifiers, mixers, switches, filters, attenuators, RF integrated circuits and more. Thanks to all who stopped by to see our new product! A picture of our booth and computer automated test setup at NI Week. For an overview of the of RFSpecTest, select this link (1.7 MB pdf file).
Upgrade and Repair Services
We have developed a computer automated Metal Tester for testing metals using thermo-electric measurements from an Acromag meter, a PC A/D converter board, and LabVIEW software. For more information, go to this page.
Filter Design Study
Computer Automated Test System for LDMOS Wireless RF Power Amplifiers
Satellite Communication Phased Array Solid State Transmitter Design
Cable TV System Model to Predict Linear and Nonlinear Performance from Headend to the Home
A software program was developed using LabVIEW, a graphical programming language from National Instruments. The program runs on a PC and is connected to an Acromag Metal Tester using a PC Data Acquisition board. The program compares the readings gathered from the Metal Tester to readings in a database for various alloys. The program then gave a readout of what metal alloy most closely coincided with the metal being tested. The program also provided probability levels (T-Test) to show confidences against the various other possible alloys in the database. The MetalTest System is currently being used to recycle aircraft engine machining scrap and is helping the company earn hundreds of thousands of dollars in metal reclamation sales.
EW System Analysis and Support
Engineering Consulting Examples: IF Receiver/Digitizer
Software was developed to retrieve the binary data from a IF Receiver/Digitizer board. The board design utilized a 10 MHz A/D converter to sample the IF signal. A Logic Analyzer attached to the board captured the digital data from the IF Receiver/Digitizer board. The computer used an IEEE-488 interface to connect to the Logic Analyzer and retrieve the values. After the binary data was retrieved, converted, and stored in an array, the data could be graphed and analyzed. The arrays were converted to a series of voltage values of the incoming signal. The voltages were plotted and then recorded. The data was then used in signal frequency and noise analysis. The Fast Fourier Tranform was used to determine the spectral content of the sampled signals. The FFT of the digital signal could then be compared to the Power Spectrum Analyzer data of the analog signal. The software was developed using National Instruments LabVIEW graphical programming language. The measured data could be stored to a data file to record that particular test.
Cryogenic Cooled RF Amplifier Development for PCS Application
High Speed Synthesizer for Medical Monitoring Equipment
The figure above is a simplified block diagram of a high speed synthesizer developed by R. A. Wood Associates for a medical application. Some of the preliminary specifications are shown below:
RF Wireless Link for 915 MHz ISM Band
Software Controlled Laser Power Meter Interface
RF System Design for F-22 Electronic Warfare (EW) System
Noise Figure Computer Automated Test
HP BASIC Software to Provide Test Interface to Micro-controller
HT BASIC Program for controlling an on-board micro-controller through a PC serial port interface. This was to be used in an automated test environment.
Subcontract Specification Development
A commercial manufacturer needed to develop a subcontract specification for an integrated RF assembly which they wanted to send out for quotations, and subcontract the design and development services. R. A. Wood Associates analyzed the requirements for the device based on its "system" application, and developed a 25 page specification for the device. All this occurred to meet a rush deadline in about 3 weeks time. More info to be provided...
Wireless Components Research
Provide research and quotes for wireless components including low noise RF amplifiers, ceramic filters, base station duplexers in the cellular frequency bands.
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