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ARFTG Conference Digest-Fall, 24th ARFTG

Date Dec. 1984

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Displaying Results 1 - 20 of 20
  • Design Considerations for Automated RF Test Equipment

    Page(s): 23 - 36
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    Radio frequency (RF) equipment repair facilities face a number of challenges in developing and applying effective test strategies. Modern communications systems are not designed around a single technology. Equipment manufacturers offer varying implementations based on an array of technologies. Naturally, test requirements for these equipments are becoming more demanding. Maintenance organizations must possess the right resources necessary to test and repair these complex systems. Defining the optimum combination of manpower and test equipment for such a facility requires proper forethought. This paper explores communications systems test and repair by establishing general design considerations for an RF ATE system, outlining test requirements for one class of RF equipment, and presenting a specific implementation. View full abstract»

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  • Spectrum Analysis with the AN/USM-410(V)

    Page(s): 53 - 66
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    The automated spectrum analysis provided by the AN/USM-410 test equipment is accomplished with a programmably tuned receiver with VDT and hardcopy numerical output data instead of the usual visual scope presentation. The present implementation is for 20 MHz to 18 GHz. Software calibration connection routines have been developed to enhance measurement time accuracy. The local oscillator signal synthesis is controlled by the run time system to insure avoidance of otherwise residual spurious responses. A wide range of input power levels and IF signal conditioning are user programmable. View full abstract»

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  • Automatic Frequency Response of Frequency-Modulated Generators Using the Bessel Null Method

    Page(s): 131 - 153
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    This paper describes a Bessel null technique to measure the frequency response of a frequency-modulated rf carrier and a program to automate frequency response measurements of signal generators with output frequencies from 0.450 to 2000 MHz. The measurements obtained using this technique are more accurate than those obtained by a highly trained technician using a manual system. Automated measurement of this process is desirable since the manual method is subject to the following problems: (1) excessive time, (2) error in finding the null, and (3) lack of assurance that the null is the first Bessel null. Automated measurements can be performed using a system controller, a spectrum analyzer, a function generator, and a voltmeter (all of which are compatible and control1ab1e remotely). The nonlinear relationship between modulating signal amplitude and the center frequency amplitude of the carrier is a major obstacle to automated measurement. This problem was solved by obtaining an approximate formula for this nonlinear curve. Assurance that the null found is the first Bessel null is provided by the analysis of the frequency response of the test signal generator as displayed on the spectrum analyzer. View full abstract»

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  • Intermodulation Products: Automated Prediction and Measurement

    Page(s): 154 - 184
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    Most intermodulation distortion measurement systems are tailored to a specific RF signal procecsing system, where it is known which intermodulation products are desired and which are undesired. An alternative and more general approach would be to apply a set of signals of known frequencies and amplitudes. Now, all products to be a specified Nth order within a specified bandwidth can be calculated and measured. In this manner, the relationship between any resultant intermodulation product and the signals producing it are known. This facilitates a more intelligent, control over the spectrum analyzer for more accurate, repeatable, and comprehensive measurement of intermodulation. View full abstract»

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  • PLANA/2.1-Enhanced Control Software for Network Analyzer Systems

    Page(s): 194 - 205
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    PLANA/2.1 is an extensive software package for controlling the HP-8409 network analyzer. PLANA has been updated to allow on-line statistical analyses of data and operation with mm-wave test sets. A version of PLANA that controls the HP-8510 network analyzer will appear in the near future. View full abstract»

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  • Verification of Waveguide Measurements Using 2-Port Standards

    Page(s): 206 - 228
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    Verification standards are required to determine the accuracy of waveguide measurements on a Vector Automatic Network Analyzer (VANA). The use of such standards can also show the importance of using certain measurement techniques. This paper deals with waveguide two-port standards which are precision, quarter-wave sections of reduced height waveguide, for which two-port s-parameters can be accurately calculated. A comparison of measured and calculated data will be shown. Measured data showing the effects of using index pins for flange alignment, and of using measured values for the calibration standards instead of nominal values will also be presented. The emphasis of this paper is primarily on presentation of measured data and comparision of the measured to the calulated data of the two-port standards. Some techniques that can be used to improve the accuracy of waveguide measurements in general are discussed, as well as how to use the two-port standards to get a feel for the level of accuracy of two-port measurements. The following is an outline of the paper, which is broken into two sections: I. Errors not Related to 2-Port Standards A. Flange Repeatibility B. Nominal vs. Measured Values for Standards II. Using 2-port Standards A. Calculation of S-parameters B. Comparision of Calculated vs. Measured Data The first section has to do with errors not related to the two-port standards that can be analyzed before getting to the two-port measurements. View full abstract»

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  • Distortion Analysis of a 10 dB Pad and a 10 cm Line with Short/Open

    Page(s): 229 - 239
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    The distortion of a signal that travels through a 10 dB pad can be analyzed by observing a short or open termination using the time-domain. This technique has application for measuring the absorption (or radiation) of energy along a transmission line or antenna. View full abstract»

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  • Error Analysis of an I and Q Linear Detector

    Page(s): 240 - 256
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    A tentative software computer program is proposed to control instruments on the IEEE Bus for testing a coherent I/Q linear detector used in search radars. Hewlett-Packard (HP) equipments are used in the test setup which features a HP-9845 option 270 desk-top computer. A four-part HPL computer program consists of an analysis section, a short routine for generation of actual error data, a reduction portion for reducing this data, and a plotting section. Results from this study indicate that amplitude and phase errors are passed through directly. Both amplitude and phase errors of the output vary at twice the angular rate (e.g., sin 2¿ not sin¿) and appear to be in quadrature. It is hoped that this work will make it easier for bench checking I/Q channels thus cutting down on the enormous amount of testing time during fabrication and final factory testing for the verification of specifications. Future work will include the hardware implementation of the test setup and measurement on an actual I/Q channel. View full abstract»

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  • ARFTG Constitution

    Page(s): 265 - 268
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    Freely Available from IEEE
  • Membership List for Automatic RF Techniques Group as of January 16, 1985

    Page(s): 269 - 303
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    Freely Available from IEEE
  • Table of contents

    Page(s): 1 - 22
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    Freely Available from IEEE
  • Survey of the articles

    Page(s): 1 - 146
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    Freely Available from IEEE
  • Author index

    Page(s): 1 - 165
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    Freely Available from IEEE
  • Table of contents

    Page(s): 1 - 102
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    Freely Available from IEEE