• Solid State Microwave Power Generation

      Brounley, Richard W.; Electronic Communications, Inc. (International Foundation for Telemetering, 1966-10)
    • Evaluation of Redundancy Reduction Algorithms

      Simpson, R. S.; University of Alabama (International Foundation for Telemetering, 1966-10)
    • Transistor-Magnetic Logic in Aerospace Timing

      Goldman, Samuel C.; Stern, Michael M.; Goldman, David J.; Di/An Controls, Inc. (International Foundation for Telemetering, 1966-10)
    • Microsecond Resolution Telemetry

      Moore, Jerry D.; Sandia Corporation (International Foundation for Telemetering, 1966-10)
    • Refinements on Analysis of PCM Synchronization

      Williard, Merwin W.; Symetrics Engineering (International Foundation for Telemetering, 1966-10)
      In this paper, the author reconsiders some of his previously reported assumptions on an analysis of mean time to establish PCM synchronization, and he provides further insight into the effect of specific synchronization patterns and parameters of the synchronization process. An improvements in one assumption shows how the analysis can provide slightly more accurate results. Specific recommendations are made for standardization of PCM sync patterns.
    • A Report on the Application of Data Abbreviation on Actual Range Telemetry Data

      Maestre, N. E.; Radio Corporation of America (International Foundation for Telemetering, 1966-10)
      The growing interest in the practical applications of data abbreviation and compaction to efficiently handle large quantities of significant information have led to numerous investigations and studies of this discipline. Although there is great potential in both the airborne and ground applications, it is primarily the latter that led RCA to initial independent data abbreviation and compaction studies. It is the purpose of this report to present results of the practical application of data abbreviation to actual telemetry data recorded on magnetic tapes. The presentation will include the affects of routine parameters, the amount of redundancy information removal, and, the reduction in processing time and recording facilities. Even though these studies involved the use of telemetry data from a mission that has already occurred, the need for the inclusion of data abbreviation devices into the existing ranges to process data in real time is becoming more apparent.
    • Low Level F. E.T. PAM Multicoder

      Gregory, Terence R.; General Devices, Inc. (International Foundation for Telemetering, 1966-10)
      This paper describes a new all solid state airborne low level PAM multicoder that employs N-channel FET for all the analog switching functions of the system. The unit features a 72KHz true chopper amplifier that affords complete isolation between input and output. This unit is fully developed and went into production in June 1966 offering many advanced features to airborne telemetry system users. Each input channel presents a true differential analog switch into the low level D. C. amplifier. The operating characteristics such as C. M. R. (100 db) out to 1KHz, no D. C. drift or gain-change, and selectable pedestal levels add to ease of operation and flexibility. Heavy use of integrated circuits was also made including monolythics, hybrids and discrete elements. The gating logic, chopper amplifier front end, and carrier amplifier/synchronous demodulator each have a separate power supply winding thus providing excellent isolation for user applications. Mechanical construction employs plug in boards affording ease of manufacture and complete interchangeability of boards between units. The system is discussed as to unique features and techniques necessary to build the unit and satisfy stringent specifications.
    • International Telemetering Conference Proceedings, Volume 02 (1966)

      International Foundation for Telemetering, 1966-10
    • UHF Telemetry Systems Design for The Edwards High-Range

      Blakely, R. T.; Bosinoff, I.; Heenan, N. I.; The Mitre Corporation (International Foundation for Telemetering, 1966-10)
      A systems design analysis for the Edwards High-Range UHF telemetry receiving station network is described which takes into account reliability, availability, design adequacy, and initial and operating costs. Alternate High-Range configurations investigate the utility of sites using omnidirectional, sector, and steerable antenna systems in both the manned and unmanned modes of operation. In the analysis, reliability, availability, and design adequacy are combined as a measure of system effectiveness in a manner that permits the system design to be selected on the basis of maximum system effectiveness for a given total systems cost. Finally, an operational guideline is presented that permits the future programming of the range operation and expansion to be premised on probable losses incurred due to down-time.
    • A User Controlled Test Data Computing System

      Fink, A. J.; Boeing Aerospace Group (International Foundation for Telemetering, 1966-10)
      Test data systems have not yet fully capitalized on the use of digital computers for the handling of test and test related data. Advancements in computing technology will make it possible to improve total efficiency of test information systems by coupling data sources to data users through remote terminals connected directly to large timesharing computing systems. The concepts which can be applied to effecting this coupling are described.
    • A Scientific Lunar Payload Communications System

      Wilker, L. B.; Space-General Corporation (International Foundation for Telemetering, 1966-10)
      Based on the selection of scientific instruments suitable for application to the payload, conceptual designs were synthesized of payload packages, including the supporting subsystems. Parametric and/or conceptual design studies were conducted of such areas as communications. The primary communications link was to be payload to lunar survey probe communication facility carried with the Apollo vehicle, e.g., modified LEM. No burden was to be placed on the basic Apollo communication system. Payload-to-earth link was also to be considered as an alternate mode, particularly for the long duration instrument operation. The communications system described in this report is a natural outgrowth of the mission requirements and presents a realistic approach to a solution of the communications problems. As such, the system described could be readily instrumented, utilizing current state-of-the-art hardware and techniques.
    • A Miniaturized RF Acceleration Measuring System

      Trapp, D. L.; Sandia Corporation (International Foundation for Telemetering, 1966-10)
      This paper will describe the design and development of a miniaturized high-shock package utilizing an FM modulated 19.8 mc transmitter and a piezoresistive accelerometer. This program was initiated in October 1965 for the purpose of measuring deceleration profiles generated by small diameter (1-1/4 inch) vehicles that penetrate targets of known composition with input velocities up to 1500 feet per second. Shock levels were anticipated to be in the 0 - 10,000 g range, with rise times varying as a function of projectile ogives and anticipated to be as fast as 100 μsec. The system was designed to an existing volume described by a right circular cylinder, 1 inch in diameter by 6 inches in length, and an allowable volume of 3/4-inch diameter by 4-inches long was allocated for the 19.8 mc transmitting antenna. The first operational usage of this system was in late January 1966.
    • A New Analog Magnetic Recording Technique

      Johnson, W. R.; Jorgensen, F.; Fairchild Winston Research (International Foundation for Telemetering, 1966-10)
      The magnetic recording process using ac bias is reviewed and applied in a discussion of recording heads. The difficulties in obtaining a sharp gradient are explained. A new magnetic recording head that overcomes the weaknesses of conventional heads is described and compared with the conventional ring core head. Performance data are listed and show improvement in frequency response, decrease in harmonic and intermodulation distortion, reduced electronics and higher reliability.
    • New Concept in High Reliability Tape Recorders for Spaceborne Data Storage

      Burdorf, D. L.; Kinelogic Corporation (International Foundation for Telemetering, 1966-10)
      The need for large bit capacity in on-board data storage for deep-space probes, spacecraft, satellites, and aircraft, has created a requirement for a tape recorder of ultra-high reliability. In an ideal recorder, the conventional capstan would be eliminated and the reels would be driven such that the linear velocity and the tension of the tape between reels would be constant from the beginning to the end of the reel. The heads would also be the only elements in contact with the tape. Reliability would be enhanced by driving the reels, rather than the tape, through a reduction in the number of moving parts. Reducing the number of elements in contact with the tape would also increase tape life. The Iso-Elastic Drive, closely approaches the ideal recorder drive system. The reels are driven by a seamless polyester belt which is in direct contact with the periphery of the tape reel. The belt is driven at constant linear velocity (resulting in low flutter) and in such a manner that it generates a constant tension in the tape connecting the two reels and passing across the heads. Constant tape tension in a high-reliability recorder is necessary in order to optimize 1) tape tracking and guidance, 2) effective bias level on the tape during direct-type recording, 3) playback level, 4) head wear, and 5) drop-outs. The Iso-Elastic Drive reduces the number of moving parts by approximately 30% as compared with conventional recorders. The tape drive has the additional desirable characteristic of operation equally well in either direction.
    • Magnetic Tape Recorder Spectral Purity

      Bradford, R. S.; 3M Company (International Foundation for Telemetering, 1966-10)
      The data recovery and reduction processes of various telemetering systems have clearly demonstrated the critical role of flutter and time errors in instrumentation recording and reproduction. One of the effects of these errors is that of "frequency smearing" of individual recorded/reproduced sine wave components. The advent of precision tape speed servo control has reduced these errors to a point where a detailed examination of the residual effect becomes both possible and profitable. The detailed measurements of the resultant spectrum of a recorded/reproduced sine wave component are described. These are quantitatively analyzed and interpreted in terms of the flutter and time error characteristics of the recording/reproduction system.
    • Magnetic Memory Techniques for High Accelerations

      McAlexander, J. C.; Cook, S. C.; Bell Telephone Laboratories; Sandia Corporation (International Foundation for Telemetering, 1966-10)
      A system to obtain and record impact data at accelerations of 3000 g’s has been designed around a 1024 word, 12 bits per word, piggyback twistor memory. Memory construction and potting techniques were developed to minimize the effect of large acceleration forces. The memory and system tests prove that the memory can withstand shock signatures beyond its original design requirements.