The frequency assignment process is meant to insure interference-free service within the service volume. This is done by choosing frequencies in a manner which provides certain minimum cochannel and adjacent channel desired to undesired signal ratios at critical points of the service volume. One of the factors which affects a station's signal strength in space is its horizontal antenna pattern. ILS localizer antennas have undergone significant changes in recent years. In order to reduce siting...
Topics: DTIC Archive, Smith,Robert D, FEDERAL AVIATION ADMINISTRATION WASHINGTON D C SYSTEMS RESEARCH AND...
Featured articles in this edition follow: Boutelle gives testimony - As given to the Committee on Armed Services Subcommittee on terrorism; Brigade Task Force communicates in OEF; Media on the battlefield: 'A non-lethal fire'; AN/PRC-150HF radio in urban combat; Mobility favors small antennas: small-loop high-frequency antennas; combat net radio lesson learned again.
Topics: DTIC Archive, ARMY SIGNAL CENTER AND FORT GORDON GA, *ARMY OPERATIONS, *COMMUNICATION AND RADIO...
We fabricated a hybrid antenna that consists of a logarithmic spiral and loop antenna. The antenna was designed to detect electromagnetic (EM) noise and be broadband in the range of 1 MHz to 1 GHz. This style of antenna can be located in buildings and passageways in inaccessible areas for the purpose of shielding integrity surveillance and life cycle shielding degradation monitoring, and can be used as permanent fixtures that detect critical threshold levels of unwanted EM radiation. The...
Topics: DTIC Archive, ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE, *LOOP...
This report provides the documentation for a set of computer applications for the evaluation of antenna parameters. The applications are written for the Mathcad personal computer software for various antenna types listed in the thesis index. Antenna dimensions and, in some cases, ground parameters are the only required inputs for each application. No new antenna parameter equations were developed as a part of this research. The chapters of this thesis are intended to provide Mathcad antenna...
Topics: DTIC Archive, Gerry, Donald D, NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF ELECTRICAL AND...
A simple equivalent circuit of recently introduced split ring resonator (SRR) is proposed in this paper. It is shown that in the vicinity of resonant frequency the SRR can be thought of electrically small capacitively loaded loop antenna. Due to resonant behaviour of the antenna current, intensity of the magnetic field of the incoming plane wave may be locally decreased yielding a stop-band with negative effective permeability. Theoretical analysis was verified by measurements of the...
Topics: DTIC Archive, Hrabar, Silvio, Bartolic, Juraj, ZAGREB UNIV (CROATIA) DEPT OF RADIOCOMMUNICATIONS...
Measurements have been made on a segment of the ELF flexible loop antenna to study its electrical sensitivity to vibration and strain. Transfer functions for the output voltage resulting from various types of vibration and strain were determined as functions of frequency, bias current, and orientation with respect to the gravitational field. Based on these laboratory measurements, it is tentatively concluded that the principle source of noise for the flexible loop antenna towed from a submarine...
Topics: DTIC Archive, Manning, Jerome E, MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB, *LOOP ANTENNAS,...
The development of a D/F system using the 8-loop antenna (fixed spaced loop) is discussed. New results obtained with the 8-loop antenna and both the twin channel technique and the goniometer method are presented. An improved 8-loop goniometer system has been constructed to provide a laboratory breadboard to solve the basic engineering problems of the system. The receiver requirements for a goniometer scan D/F system are discussed in detail with comparisons of the R-390A, RA.17C and the...
Topics: DTIC Archive, Moore, John D, SOUTHWEST RESEARCH INST SAN ANTONIO TX, *DIRECTION FINDING,...
This report describes the design, assembly, and electrical matching of two identical measurement systems that were used in an experiment conducted by APL for the U.S. Air Force and the Defense Advanced Research Projects Agency to determine the validity of one facet of the theory of groundwave propagation at 100 kHz. It is Volume C of four volumes. Volume A is the summary report, Volume B covers test operations, and Volume D documents the data and analysis. The goal of the experiment was to...
Topics: DTIC Archive, Oden,S F, Perschy,J A, JOHNS HOPKINS UNIV LAUREL MD APPLIED PHYSICS LAB,...
This report presents the first annual review of research at Ohio State sponsored by the Joint Services Electronics Program (JSEP). The research is in the area of electromagnetics and the specific topics are: (1) Diffraction Studies; (2) Hybrid Techniques; (3) Surface Cell Model; (4) Electrically Small Antenna Studies; (5) Time Domain Studies; and (6) Adaptive Array Studies. (Author)
Topics: DTIC Archive, OHIO STATE UNIV COLUMBUS ELECTROSCIENCE LAB, *DIFFRACTION, *METHOD OF MOMENTS, *SLOT...
This publication is one of six catalogs produced in order to collect data on all types of military antennas in readily accessible form. This volume deals with unclassified shipboard and buoy antennas.
Topics: DTIC Archive, KYLE, ROBERT J, GEORGIA INST OF TECH ATLANTA ENGINEERING EXPERIMENT STATION,...
Printed multi-turn loop antennas have been designed for contactless powering of, and reception of radio signals transmitted by, surgically implantable biotelemetric sensor units operating at frequencies in the vicinity of 300 MHz.
Topics: NASA Technical Reports Server (NTRS), BIOTELEMETRY, LOOP ANTENNAS, RADIO FREQUENCIES,...
Properties of the ionosphere D region under conditions of a solar total eclipse were measured utilizing a VLF receiving system in Bolivia. The signals were transmitted from southeast Brazil along the path of totality for the 12 November 1966 solar eclipse. This report describes the study conducted for the selection of a VLF receiving antenna which was to provide maximum discrimination against atmospheric noise in the 9- to 31-kc band. The antenna selected was a two-loop superdirective antenna...
Topics: DTIC Archive, Hildebrand, V E, NAVAL ORDNANCE LAB CORONA CA, *IONOSPHERIC PROPAGATION, *LOOP...
In this paper, a novel printed multi-turn loop antenna for contact-less powering and RF telemetry from implantable bio- MEMS sensors at a design frequency of 300 MHz is demonstrated. In addition, computed values of input reactance, radiation resistance, skin effect resistance, and radiation efficiency for the printed multi-turn loop antenna are presented. The computed input reactance is compared with the measured values and shown to be in fair agreement. The computed radiation efficiency at the...
Topics: NASA Technical Reports Server (NTRS), LOOP ANTENNAS, TELEMETRY, RADIO FREQUENCIES,...
Apparatus is described for determining the distance to lightning strokes from a single station. The apparatus includes a first loop antenna system for sensing the magnetic field produced by the lightning which is filtered, square rooted, and fed into a peak voltage holding circuit. A second antenna is provided for sensing the electric field produced by the lightning which is fed into a filter, an absolute value meter, and to a peak voltage holding circuit. A multivibrator gates the magnetic and...
Topics: NASA Technical Reports Server (NTRS), DISTANCE MEASURING EQUIPMENT, ELECTRIC FIELDS, LIGHTNING,...
03 Apr 1968 227964213
Topics: Loop antennas, Electrical impedance, Aircraft antennas, Ham radio, Amateur radio, Efficiency,...
A computer model has been developed that estimates bearing error for a VOR airborne navigation system operating in the presence of small, parasitic scatterers such as antennas, antenna masts, and guy wires. This model, which is written using FORTRAN 77, interacts with an unmodified version of the Numerical Electromagnetics Code (NEC-2) to obtain the pertinent scattered-field data. These data are then used to calculate the composite field, and indicated bearing, at the airborne receiver...
Topics: DTIC Archive, Barre, Paul R., AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH,...
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Real-time tracking of multiple targets and three dimensional object features was demonstrated using a laser range scanner. The prototype was immune to ambient illumination and sun interference. Tracking error feedback was simultaneously obtained from individual targets, global predicted target position, and the human operator. A more complete study of calibration parameters and temperature variations on the scanner is needed to determine the exact performance of the sensor. Lissajous patterns...
Topics: AEROSPACE ENGINEERING, ELECTROMAGNETIC FIELDS, ELECTROMAGNETIC RADIATION, ELECTROMAGNETIC...
Federal Aviation Administration Systems and Research and Development efforts have resulted in the development of a set of Instrument Landing System localizer antenna arrays of the traveling wave type. These arrays including integral monitors have been shown capable of overcoming the major shortcomings associated with earlier antennas. The results of this effort are summarized. Distinguishing performance characteristics are pointed out for each of the so-called Type O, 1A, 1B and II antenna...
Topics: DTIC Archive, Peterson,Carl G, FEDERAL AVIATION ADMINISTRATION WASHINGTON DC SYSTEMS RESEARCH AND...
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Magnetic reversal applications to stratigraphic problems in geology
Topics: FOLDING STRUCTURES, LOOP ANTENNAS, SPACE ERECTABLE STRUCTURES, SPACECRAFT STRUCTURES, CENTRIFUGAL...
The Models 2.040 and 2.041 Quadraloop Antennas are the result of a mounting problem associated with the Aerobee rocket telemetry extension. The Model 2.041 is the pressurized version of the un-pressurized Model 2.040. Electrical and mechanical characteristics are given in the form of graphs and figures.
Topics: DTIC Archive, NEW MEXICO STATE UNIV LAS CRUCES PHYSICAL SCIENCE LAB, *TELEMETERING ANTENNAS, *LOOP...
Tapan Sarkar wrote a substantial technical paper on a transformation mapping an antennas near-field into its far field. A numerical implementation of Sarkars near-to-far transformation is assessed in this report. This report assesses this near-to-far implementation on the following antenna models using only a finite number of near-field samples: Analytic antenna models where the near field, far field, and the spherical expansions are computable in closed form, Mini-NEC antenna simulations where...
Topics: DTIC Archive, Meloling,John H, Space and Naval Warfare Systems Center Pacific San Diego United...
In this report we investigate the possibility of using ultra-low- frequency (ULF) signals from airborne loop antennas (i.e., magnetic dipoles) for air/undersea communication. Because of the low data rate at ULF, communication is here understood to mean the transfer of short messages of high information content. We use numerical integration to calculate the 1 Hz total magnetic field amplitudes in the sea at depths from 0 m to 200 m due to airborne unit moment vertical and horizontal magnetic...
Topics: DTIC Archive, Fraser-Smith, A. C., STANFORD UNIV CA STANFORD ELECTRONICS LABS, *DATA TRANSMISSION...
This document is one of a series issued by the DCA/MEECN System Engineer which is directed at definitive prediction of the time availability of VLF/LF radio system included in the MEECN. The studies described in this report are critical to VLF/LF system performance. The tri-Service Propagation program was established by the MEECN System Engineer to improve the accuracy and reliability of VLF/LF link integrity analyses. This report presents experimental data derived from field strengths of...
Topics: DTIC Archive, DEFENSE COMMUNICATIONS AGENCY ARLINGTON VA, *COMMUNICATIONS NETWORKS, *IONOSPHERIC...
This project deals with development of a man overboard detection and location system for use on documented vessels. Preliminary research indicated that radio (RF) systems offered more potential than sonar. The concept for use of the RF system involves a small transmitter the size of a metal tape rule to be worn by each crewman while on deck. In the event of a fall overboard, the unit automatically begins transmitting which actuates an alarm and serves as a homing device for rescue. The major...
Topics: DTIC Archive, Bowman,J, WYLE LABS HUNTSVILLE ALA, *RADIO BEACONS, *RESCUE BEACONS, CONTINUOUS...
This report provides a summary of high latitude ionospheric reflectivity as observed by the USAF high resolution VLF/LF ionosounder operating in northern Greenland. Ionospheric reflectivity parameters, including reflection heights and coefficients, are presented as a function of time of day. VLF long path propagation measurements, along with magnetometer and riometer data, are presented as supplementary data. (Author)
Topics: DTIC Archive, Pagliarulo,Robert P, ROME AIR DEVELOPMENT CENTER GRIFFISS AFB NY, *IONOSONDES,...
The long-term goal of this research is to develop multifrequency, high-frequency (HF) radar techniques and instrumentation for measuring surface currents, waves, and winds in coastal regions and large lakes for scientific, civil, and military applications. The goals include deployment of HF radar systems in coastal regions for air-sea interaction and coastal oceanography research as well as technology development. This project began with the completion and deployment of two multifrequency HF...
Topics: DTIC Archive, MICHIGAN UNIV ANN ARBOR DEPT OF ATMOSPHERIC OCEAN AND SPACE SCIENCES, *AIR WATER...
This report serves as the user's manual for the X-Antenna code. X-Antenna is intended to simplify the analysis of antennas by giving the user graphical interfaces in which to enter all relevant antenna and analysis code data. Essentially, X-Antenna creates a Motif interface to the user's antenna analysis codes. A command-file allows new antennas and codes to be added to the application. The menu system and graphical interface screens are created dynamically to conform to the data in the...
Topics: NASA Technical Reports Server (NTRS), ANTENNA DESIGN, ANTENNA RADIATION PATTERNS, APPLICATIONS...
A Calibrated, Omnidirectional, LF Loop Antenna for GWEN (Ground Wave Emergency Network). 1989-07 "This paper presents the design and performance characterization of a calibrated, omnidirectional, mobile LF receive antenna. This antenna is unique in its use of active circuitry to isolate two crossed-loop antenna elements from the combining network. A prototype was built for the Ground Wave Emergency Network (GWEN) in the 150 to 175 kHz band. The prototype has an effective height of 39...
Topics: Ground Wave Emergency Network, Cold War, LF, Longwave, LW, Loop Antennas, Electrical and electronic...
Erratic operation of Raydist T radio navigation equipment aboard mine countermeasures helicopters has been traced to fuselage-tow cable interactions with the Raydist receiving antenna and to negative-corona generated impulse noise. The development of a balanced active antenna and an impulse noise blanker which have proved successful in reducing these detrimental effects are described. The final system is described in detail and the results of laboratory tests are presented (Author).
Topics: DTIC Archive, Ludlum,Bobby R, NAVAL COASTAL SYSTEMS CENTER PANAMA CITY FL, *Radio navigation,...
Wireless sensors are desired for monitoring aircraft engines, automotive engines, industrial machinery, and many other applications. The most important requirement of sensors is that they do not interfere with the environment that they are monitoring. Therefore, wireless sensors must be small, which demands a high level of integration. Sensors that modulate an oscillator active antenna have advantages of small size, high level of integration, and lower packaging cost. Several types of...
Topics: NASA Technical Reports Server (NTRS), FIELD EFFECT TRANSISTORS, LOOP ANTENNAS, MICROWAVE...
A new reaction solution was formulated for three-dimensional wire antennas located in free space or over a ground plane, using a piecewise- sinusoidal expansion for the unknown current distribution on the antenna. A set of linear equations was developed for solution by a digital computer. Impedance, radiation efficiency, field patterns, gain, and directivity can be calculated. Computer programs based on this new formulation were used to determine the impedance versus frequency for various loop...
Topics: DTIC Archive, Richards, G A, OHIO STATE UNIV COLUMBUS ELECTROSCIENCE LAB, *ANTENNAS, COMPUTER...
A method of capacitive connection to the signal winding of a towed ELF loop antenna is proposed which achieves a smoothly tapered sensitivity profile using a series of strictly uniform and standard fabrication steps. Thus the expense, risk and waste involved in the non-uniform methods of core permeability tapering, core cross section tapering or turns density tapering can be avoided.
Topics: DTIC Archive, Burrows, Michael L., MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB, *LOOP...
The Office of Naval Research Forward Deployed Energy and Communications Outpost (FDECO) Program is an Innovative Naval Prototype (INP). One of the critical wireless data link methods under the program is very low frequency (VLF) radio frequency (RF) communication in the ocean environment. This report presents experiments and findings for VLF RF communications using both commercial off the shelf (COTS) transceivers acquired from vendor Wireless For Subsea (WFS) and low-cost loop antennas that...
Topics: DTIC Archive, Dea, Jack, SSC Pacific San Diego United States, VERY LOW FREQUENCY, RADIO FREQUENCY,...
The application of carbon nanotube (CNT) materials to produce lightweight, flexible, and durable alternatives to existing and future Army antenna designs is explored through fabrication and measurement of a variety of CNT thread and sheet antenna designs. A variety of CNT thread/rope dipole and loop antennas are fabricated, measured, and compared with a standard copper dipole antenna. An aperture-coupled patch antenna composed of CNT sheet material, is fabricated, measured, and compared with a...
Topics: DTIC Archive, ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE, *CARBON...
A phenomenological theory was developed to analyze the response of an RF intrusion detection system. The system consisted of a loop of leaky coax cable which acted as a distributed transmitting antenna and one or more receiving monopoles located inside the loop. The variation in received signal power was computed for two system configurations. The first used a single arbitrarily located receiving antenna; the second used two receiving antennas. The results showed an increase in system response...
Topics: DTIC Archive, Poirier, J. L., ROME AIR DEVELOPMENT CENTER HANSCOM AFB MA DEPUTY FOR ELECTRONIC...
As the S-band spectrum becomes crowded, future space missions will need to consider moving command and telemetry services to Ka-band. NASA's Space Communications and Navigation (SCaN) Testbed provides a software-defined radio (SDR) platform that is capable of supporting investigation of this service transition. The testbed contains two S-band SDRs and one Ka-band SDR. Over the past year, SCaN Testbed has demonstrated Ka-band communications capabilities with NASAs Tracking and Data Relay...
Topics: NASA Technical Reports Server (NTRS), TDR SATELLITES, SPACE COMMUNICATION, BANDWIDTH, COMMUNICATION...
This report describes development of a tri-axial mutually orthogonal broadband twin-loop receiving antenna for the HF band. The three twin-loops have been arranged so that they exhibit the same distributed parameters between themselves and ground. The upper frequency limit of the antenna is discussed and a method for extending the low frequency cut-off is presented. The antenna noise factor is calculated from measured data.
Topics: DTIC Archive, DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) COMMAND CONTROL...
Initial results obtained from an investigation using pattern recognition techniques for identifying fault modes in the Deep Space Network (DSN) 70 m antenna control loops are described. The overall background to the problem is described, the motivation and potential benefits of this approach are outlined. In particular, an experiment is described in which fault modes were introduced into a state-space simulation of the antenna control loops. By training a multilayer feed-forward neural network...
Topics: NASA Technical Reports Server (NTRS), CLASSIFICATIONS, COMPUTERIZED SIMULATION, DEEP SPACE NETWORK,...
Previous work on the characteristics of electrically small antennas, antennas in the tip region of a conical projectile, and antennas in or on a conical projectile is briefly reviewed. Using computer modelling new design data for antennas in the tip region of a conical projectile in the frequency range 500 to 1100 MHz is presented. A loop-dipole combination is used to obtain a cardioid type pattern in the forward hemisphere.
Topics: DTIC Archive, Newman, E H, OHIO STATE UNIV COLUMBUS ELECTROSCIENCE LAB, *ANTENNAS, ANTENNA...
Federal Aviation Administration Systems and Research and Development efforts have resulted in the development of a set of Instrument Landing System localizer antenna arrays of the traveling wave type. These arrays including integral monitors have been shown capable of overcoming the major shortcomings associated with earlier antennas. The results of this effort are summarized. Distinguishing performance characteristics are pointed out for each of the so-called Type O, 1A, 1B and II antenna...
Topics: DTIC Archive, Peterson,Carl G, FEDERAL AVIATION ADMINISTRATION WASHINGTON DC SYSTEMS RESEARCH AND...
As the S-band spectrum becomes crowded, future space missions will need to consider moving command and telemetry services to Ka-band. NASAs Space Communications and Navigation (SCaN) Testbed provides a software-defined radio (SDR) platform that is capable of supporting investigation of this service transition. The testbed contains two S-band SDRs and one Ka-band SDR. Over the past year, SCaN Testbed has demonstrated Ka-band communications capabilities with NASAs Tracking and Data Relay...
Topics: NASA Technical Reports Server (NTRS), TDR SATELLITES, SPACE COMMUNICATION, BANDWIDTH, COMMUNICATION...
The Space Sciences Laboratory of The Aerospace Corporation is currently defining an experiment to test a loop antenna configuration as a very low frequency (VLF) transmitter in the ionosphere. The experiment is sponsored by the Naval Air Systems Command. The primary objectives of the experiment are to validate existing models for radiation by a loop antenna and to study the performance of the antenna in the ionospheric plasma. The antenna will be carried into orbit in the payload bay of the...
Topics: DTIC Archive, Koons,H C, AEROSPACE CORP EL SEGUNDO CA SPACE SCIENCES LAB, *LOOP ANTENNAS,...
We present a detailed electromagnetic analysis of an electrically small colocated electric dipole and magnetic loop antenna array. This antenna is the simplest example of the Grimes multipole class of antenna arrays. We have determined that since the interaction term between the two elements disappears from the radial complex power, we were able to set the radial reactance to zero by choosing appropriate current magnitudes and phases on the array elements. By driving the two elements in...
Topics: DTIC Archive, Overfelt, P L, NAVAL AIR WARFARE CENTER WEAPONS DIV CHINA LAKE CA, *ELECTROMAGNETIC...
THE APPLICABILITY OF THE FIRST LAYER CONJUGATE POLE PAIR AT A TIME EQUIVALENT CIRCUIT SYNTHESIS FOR ENERGY COLLECTING STRUCTURES IS CONSIDERED. It is found that, at least for some highly resonant structures, the whole eigenset of poles can be approximately represented by the first layer dominant pole. The driving point admittance function can then be synthesized in the form of a parallel connection of simple pole-pair modules. the biquadratic functions corresponding to each conjugate pole pair...
Topics: DTIC Archive, Michalski,Krzysztof A, KENTUCKY UNIV LEXINGTON DEPT OF ELECTRICAL ENGINEERING,...
A systematic approach is developed for the synthesis of physically realizable equivalent circuits for antennas and scatterers with definable ports from their SEM (Singularity Expansion Method) description. The necessary SEM information includes the complex natural resonances (or 'poles') of the structure and the associated modal currents ('natural modes') and normalization coefficients. From the poles and natural modes one can compute the coupling coefficients, which weight the given...
Topics: DTIC Archive, Michalski,Kryzstof A, MISSION RESEARCH CORP SANTA BARBARA CA, *EQUIVALENT CIRCUITS,...
Analytical studies of mast-cable-hoop-membrane type antennas were conducted using a transfer matrix numerical analysis approach. This method, by virtue of its specialization and the inherently easy compartmentalization of the formulation and numerical procedures, can be significantly more efficient in computer time required and in the time needed to review and interpret the results.
Topics: NASA Technical Reports Server (NTRS), ANTENNA COMPONENTS, DYNAMIC STRUCTURAL ANALYSIS, LOOP...
The Plasma Wave Instrument on the Polar spacecraft is designed to provide measurements of plasma waves in the Earth's polar regions over the frequency range from 0.1 Hz to 800 kHz. Three orthogonal electric dipole antennas are used to detect electric fields, two in the spin plane and one aligned along the spacecraft spin axis. A magnetic loop antenna and a triaxial magnetic search coil antenna are used to detect magnetic fields. Signals from these antennas are processed by five receiver...
Topics: NASA Technical Reports Server (NTRS), PLASMA WAVES, POLAR REGIONS, PLASMA RADIATION, RADIO...
Digital techniques are discussed for application to the servo and control systems of large antennas. The tracking loop for an antenna at a STADAN tracking site is illustrated. The augmentation mode is also considered.
Topics: NASA Technical Reports Server (NTRS), AUTOMATIC CONTROL, COMPUTER TECHNIQUES, DIGITAL SYSTEMS, LOOP...
This report provides a summary of high latitude ionospheric reflectivity as observed by the USAF high resolution VLF/LF ionosounder operating in northern Greenland. Ionospheric reflectivity parameters, including reflection heights and coefficients, are presented as a function of time of day. VLF long path propagation measurements, along with magnetometer and riometer data, are presented as supplementary information.
Topics: DTIC Archive, Rasmussen, John E., ROME AIR DEVELOPMENT CENTER GRIFFISS AFB NY, *IONOSPHERIC...
The general problem of permeable body in external magnetic fields is formulated as a two-dimensional Fredholm integral equation of the second kind. Using the method of averaging functional corrections, the equation is solved approximately for a highly-permeable rectangular solid (a) in a uniform field and (b) in the field of a rectangular current loop wound around the midsection of the solid. A large magnetic flux concentration is found in both cases for a thin solid. The results are applicable...
Topics: DTIC Archive, Lam,John, DIKEWOOD INDUSTRIES INC ALBUQUERQUE N MEX, *ELECTROMAGNETIC FIELDS,...
