Electrical & Computer Engineering Theses and Dissertations
Permanent URI for this collectionhttp://hdl.handle.net/1903/2765
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Item Sunspots, and the Solar Influence Upon High Frequency Radio Communications(1960) Jacobs, George; Reed, Henry R.; Electrical Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md)Item The Application of the Gyrator Concept to Transistors(1956) Breeskin, Sol Daniel; Corcoran, George F.; Electrical & Computer Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md)Item PRESENTATION OF A NEW HIGH-FREQUENCY COMMUNICATION SYSTEM PERFORMANCE PREDICTION TECHNIQUE(1965) Gatts, Thomas Fiscus Jr.; Reed, Henry R.; Electrical & Computer Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md)The prediction technique developed by the National Bureau of Standards has been used extensively by high-frequency communicators. An adaption of this technique is used to demonstrate the type of results obtained when applied to the Buffalo, N.Y. to Boston, Mass. (B/B) link for January and July 1965. A new prediction technique is presented which will allow the HF communicator to predict system performance between the maximum useable frequency (MUF) and the lowest useable frequency (LUF) and which is flexible enough to allow system parameter changes to be made and the effect on the overall system determined. The new technique is demonstrated by applying it to the B/B link for January and July 1965 and displaying the results in the form of relative gain contours, which show the effect on communication capability of reducing the LUF by increasing system gain and the increase in process gain that may be achieved for the purpose of raising the data rate or decreasing transmission error rate. Some of the many applications of the results of this new technique are presented. The results are used: (1) to facilitate the selection of necessary operating frequencies to provide communication throughout a 24-hour period, (2) to estimate the severity and length of occurrence of multipath, (3) to investigate possible frequency adaption, and (4) to investigate possible power adaption.Item A Set of Karnaugh Map Manipulation Computer Routines for Use in Logic Design(1968) Shub, Charles Martin; Marcovitz, Alan B.; Electrical Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md)The Karnaugh map provides a convenient visual aid for the manipulation of switching functions for both the design engineer and the student of logic design. Algorithms for the minimization of switching functions by the manipulation of information displayed on a Karnaugh map are presented, along with a method of obtaining more information than was previously possible from the Karnaugh map. A dynamic, flexible, and easy to use collection of computer subroutines written in the MAD language to accomplish such manipulations as a subset of an entire logic design system of computer programs is described. A user's manual for the entire system is included, as well as descriptions of the programs used in conjunction with the map manipulation process. Several examples are included.Item Study of a UHF Command Destruct Missile Antenna System(1960) Mullins, Elwood Hatcher; Schuchard, E.A.; Electrical and Computer Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md)