• A Meteor Burst Telemetry System for a Nuclear Lunar Power Plant

      Swisher, B. F.; Johnson, R. E.; Boeing Company (International Foundation for Telemetering, 1965-05)
      The meteor burst telemetry system to be described was conceived, designed, and developed as an Engineering Model. The telemetry system will be used to telemeter oceanographic data from an experimental instrumented ocean buoy to be moored at continental shelf depths on Cobb Seamount to shore facilities at Seattle, Washington. Cobb Seamount is located in the Pacific Ocean approximately 300 miles off the coast of the State of Washington. A general description of the telemetry system and its operational characteristics, which are dictated by the statistical characteristics of the meteor burst mode of propagation, is presented. This is followed by a more detailed description of equipment elements of the system. The developmental status, the results of a propagation path field test, and plans for additional tests are discussed. Development results to date are sufficiently encouraging to generate confidence in the utility of a meteor burst telemetry system for oceanographic data acquisition.
    • Meteorological Rocket Telemetry in the 1680 Megacycle Band

      Drews, William A.; Walton, W. T.; Atlantic Research Corporation (International Foundation for Telemetering, 1965-05)
      A summary of the present state of design and a review of hardware currently in use and under development for meteorological rocket payloads is given. Important design parameters are discussed and the constraints imposed by existing ground support equipment are described.
    • A Microwave Telemetry Automatic Tracking Antenna

      Bejarano, Eduardo; White Sands Missile Range (International Foundation for Telemetering, 1965-05)
    • Miniature Telemetry Transmitter

      Wiley, J. R.; Busch, W.; Langan, L.; M.C.D. General Electric Company (International Foundation for Telemetering, 1965-05)
      The increased use of L and S-Band for telemetry services in conjunction with the need for miniaturized equipment, points up the desirability for compact transmitter units. This report describes a miniature S-Band transmitter and its associated power supply. The design goals are presented together with a discussion of the technical approach used to meet the severe requirements. Illustrations and performance data are included for completeness.
    • A Multiple-Beam Scanning Circular Array

      Chadwick, George G.; Glass, John C.; Hill, Jerome E.; Radiation Systems, Inc. (International Foundation for Telemetering, 1965-05)
      The geometry of the cylindrical array has always been appealing to system designers because of its ability to provide 360° of coverage. A technique will be discussed which allows a cylindrical array to provide high-resolution coverage over 360° of azimuth angle. When used as a scanning array, a beam may be swept through 360° by using any of the numerous techniques available for scanning a linear array. When used to provide multiple beams, an array of N elements is excited by N isolated inputs. Each input corresponds to a beam in a selected direction; all of the N beams being disposed uniformly over 360° of azimuth angle. In both the instance of the scanning array and the multiple-beam array, the resolution achieved is comparable to that available from a planar aperture of the same height and with a length equal to that of the cylinder diameter. The theory of operation for the cylindrical array is discussed in abridged form. Data are also presented for experimental four-, eight-, and sixteen-element cylindrical arrays.
    • A New Approach to Effective Digital Filter Design

      Duncan, P. H.; Douglas Aircraft Company (International Foundation for Telemetering, 1965-05)
      In this paper the effect of modifying digital filter weights derived on a least squares error basis through multiplication by certain weighting functions is investigated. It is shown that this approach amounts to adopting frequency resolution as a filter performance criterion, in a manner analogous to resolution in spectral estimates along the lines of Blackman and Tukey. Weight formulation using the method is very simple, and working transfer functions are easily estimated without computation. Simple, effective designs are presented for low, high and band-pass (or band-stop) filters of the "cosine" or in-phase type, for cosine "low low-pass" and "sampling" filters, and for "sine" or quadrature "sampling" filters, as well as differentiators.
    • A New Approach to Solid-State Communicator Design

      Schoenwetter, H. K.; General Devices, Inc. (International Foundation for Telemetering, 1965-05)
      An electronic commutator is described which employs only two types of modules and is expandable one channel at a time. Either high or low level commutators can be constructed. Data input circuits are completely isolated from gating voltages. Power per channel is 10 milliwatts; volume, 0.4 cubic inch. Commutator modules are suitable for air/spacecraft environments.
    • New Techniques in Telemetry Data Processing for the Apollo/Saturn S-II Program

      Moore, Paul D.; Frederickson, Water G.; North American Aviation, Inc.; Radiation Incorporated (International Foundation for Telemetering, 1965-05)
      The Apollo/Saturn S-II telemetry data processing systems are described from concept through development and fabrication. The systems are large-scale, dual computer-controlled systems that accept PCM, PAM, PDM, FM/FM, and FM data and are capable of processing raw data for display as time-history digital plots, tabulations, or oscillograph recordings. Stored-program decommutators which eliminate distribution patchboards for each data word are integrated into the system, thus, providing a flexible means of routing data with a minimum of human error. High-speed digital plotter/printers produce final annotated plots of selected channels for engineering reports, Small general-purpose computers are integrated in the system to establish data flow discipline. The computers function as an entry for operation control and for preparation and loading information to all programmable equipment, interconnecting digital equipment, process monitoring, and diagnostic testing of subsystem operation. Versatility of computer or manual systems control provides an optimum telemetry data processing environment. Advanced techniques are briefly discussed as related to these and other telemetry data processing systems.
    • A Novel PMCM System for Geophysical Research

      Toney, P. A.; Walter, J. M.; Dynatronics, Inc. (International Foundation for Telemetering, 1965-05)
      The concepts leading to development of an inexpensive digital data acquisition system employing novel Pulse-Morse Code Modulation and providing accuracy comparable to that of PCM are discussed. The several system-level and circuit-level considerations permitting the complete elimination of separate signal conditioning equipment and receiving-site synchronization, recording and processing equipment are presented. Finally, there is a brief commentary on future applications of the device and suggestions for related work.
    • The Operational Pre-D for the Atlantis Missile Range

      Shollenberger, George D.; Defense Electronics, Inc. (International Foundation for Telemetering, 1965-05)
      This newly-developed receiving and predetection recording system currently being integrated into the Atlantic Missile Range should prove of considerable interest to the telemetry systems engineer. The system, designated TRKI-12, will become part of the familiar "Range Rehabilitation Program." The TRKI-12 is capable of handling up to twelve simultaneous telemetry signals of any known or projected telemetry format. Frequency-translation methods used enable recording and reproduction of high bit-rate PCM and other wide-bandwidth signals with minimum distortion. A wideband FM recording method gives true DC to 500-kc bandwidth recordings. The system incorporates a diversity reception and combining concept enabling optimum combination of telemetry data from diversity antenna systems without undesirable byproducts or need for special phase-correction. The description herein, which includes design constraints and limitations for a system of this type, should yield information of concern to the range user and should be especially useful in establishing efficient and economical range interfaces.
    • An Operational Test Instrument for PCM Bit Synchronizers/Signal Conditioners

      Cumings, R. G.; Davies, R. A.; Defense Electronics, Inc. (International Foundation for Telemetering, 1965-05)
      The application for a device which will effectively test a PCM bit synchronizer/signal conditioner is described. The general requirements for a bit synchronizer analyzer are listed and some of the problems in implementing these requirements are discussed, including some problems relating to PCM signal conditioners. A description of an instrument capable of performing the required measurements is given.
    • Optimization of Potentiometric Type Pressure Transducers

      Welsh, Luther; Marks, Eugene A.; Bourns, Inc. (International Foundation for Telemetering, 1965-05)
      Potentiometric pressure transducer designs can be optimized to allow application of a given model or family to a very wide range of pressures with consistently low static error band. Analytical and empirical design relationships are developed and correlated to suggest specific optimization techniques.
    • Propagation Characteristics of the Space Channel

      Baghdady, Elie J.; ADCOM, Inc. (International Foundation for Telemetering, 1965-05)
      A discussion is provided of the propagation phenomena, and their associated disturbances, that have been observed to cause significant degradation of the performance of space instrumentation and communication links.
    • A Radiation Hardened L-Band Telemetry Transmitter

      Butler, Dan M.; Ling-Temco-Vought, Inc. (International Foundation for Telemetering, 1965-05)
      The advent of requirements for nuclear radiation hardened telemetering components is accompanied by numerous technological problems. Future vehicles may impose severe environmental problems on a telemetering transmitter, as well as the need for relatively high r. f. power output. This paper describes the development of a nuclear radiation hardened telemetry transmitter, designed for operation in the 1435-1535 MC/S band at a nominal 100 W average R.F. power. The development phases covered in the paper consist of (1) design and radiation test of three low power transmitter exciters, (2) design and test of three transmitters, including the 100 W power amplifier and circuit modifications as dictated by radiation test, and (3) change in selection of the final R. F. tube. The paper includes a description of the resultant developmental transmitter, some comments on the major radiation effects problems, and some of the considerations in the radiation test of the transmitter. The author concludes with current status remarks.
    • Receiver Noise Factor

      Hildner, Ernest G.; National Bureau of Standards (International Foundation for Telemetering, 1965-05)
      The Institute of Radio Engineers definition of receiver noise factor is reviewed and adopted for this paper. The definition’s implications are explored. CW-and dispersed-signal source measurement techniques are discussed and the mathematical base for each method is displayed. The quantities which must be measured in each method are pointed out with the respective advantages and disadvantages. It is concluded that the dispersed-signal source measurement technique is simpler than the CW-signal source techniques considered in this paper.
    • Recent Developments Pertaining to Solid-State S-Band Transmitters

      Slone, Sam; Fjeldsteld, Norman B.; Monitor Systems (International Foundation for Telemetering, 1965-05)
      This paper discusses the performance of some recent R. F. power transistors as frequency multipliers and relates this information to their use in solid state V. H. F. and U. H. F. Telemetry Transmitters. The step-recovery diode is - similarly discussed. Both devices are shown to have great promise for ultimately lowering the complexity, size, and price of Solid State S Band and L Band Telemetry Transmitters.
    • Research and Development Work on Personal Telemetry Systems

      Marko, Adolf R.; Wright-Patterson Air Force Base (International Foundation for Telemetering, 1965-05)
    • Rocket Trajectory Analysis from Telemetered Acceleration and Attitude Data

      Cooper, Oscar L.; Research Foundation, Oklahoma State University (International Foundation for Telemetering, 1965-05)
      Double integration of the longitudinal acceleration of a sounding rocket is useful as a simple means of determining its trajectory. Reasonably accurate altitude calculations can be made by this method except when surface winds alter the launch angle of the rocket. Surface wind velocity corrections can be introduced to correct velocity and position information in the horizontal direction, but accurate wind correction data is difficult to obtain for all rockets. A special solar aspect sensor was designed to be used with a commercially available magnetic aspect sensor for rocket attitude determination. This attitude data allows the longitudinal acceleration to be broken more accurately into three vector components. A feasibility study of the aspect system was made using three Aerobee-150 rockets. A digital computer trajectory program was written to utilize aspect and acceleration data for trajectory analysis. It is evident that rocket attitude data is a useful supplement to the longitudinal acceleration data for trajectory determination. More accurate magnetic aspect data is necessary, however, to refine the longitudinal acceleration technique.
    • A Single-Transistor, L-Band Telemetering Transmitter

      D'Elio, C.; Poole, J.; RCA Electronic Components and Devices (International Foundation for Telemetering, 1965-05)
    • A Six-Channel Physiological Telemetering System

      Robrock, R. B., II; Ko, W. H.; Case Institute of Technology (International Foundation for Telemetering, 1965-05)
      A six channel FM/FM physiological telemetering system was designed to measure two surface temperatures, an internal temperature, the respiration rate, and position and muscle spasm of a paralyzed patient. Tunnel diode subcarrier oscillators operating from a constant-current source provided excellent temperature and long term stability while permitting a complete transmission package with size 0.6" x 2.5" x 2.5" and weight 15 gm. A compatible transistorized receiving system was also constructed.