2 February 1998
                        YAGI GENETIC OPTIMIZER
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	YGO (YAGI GENETIC OPTIMIZER) designs optimized Yagi antennas
 using one of the most recent and powerful techniques in applied electro-
 magnetics: a genetic algorithm.  A genetic algorithm mimics natural sel-
 ection ("survival of the fittest") by creating generations of Yagi designs
 in which the best designs ("individuals") pass their design parameters
 ("genes") onto the next generation in such a way that better and better
 antennas are the result.  GA optimizers can produce remarkable results
 not achievable with any other design technique.  Genetic algorithms are
 superior to deterministic optimzers, and they are easily implemented on
 a PC.

	YGO is user-friendly and easy to run.  All GA parameters are
 changed by editing a single set-up file.  The user can specify popu-
 lation size, number of generations, antenna figure-of-merit, and all
 other parameters needed by the GA.  The Yagi's performance is computed
 using NEC-2D, the state-of-the-art Numerical Electromagnetics Code
 (double precision) developed at Lawrence Livermore National Laboratory.

	When YGO has completed its optimization, the radiation pattern of
 the best antenna is plotted on screen.  A separate plotting utility allows
 the user to view radiation patterns for other top designs on a generation-
 by-generation basis.  One of the GA's most attractive features is that,
 instead of producing only one "best" design, it produces groups of designs
 that achieve similar performance.  The designer can then select from these
 groups the Yagi that best meets the requirements.

	YGO is installed on your hard drive by copying the self-extracting
 installation program YGO_INST.EXE into the default directory from which
 YGO will be run.  You must first create that directory ("YGO" is the
 suggested directory name).  Running YGO_INST.EXE in the default directory
 recovers YGO.EXE and its associated files.

	Be sure to check the README.TXT and YAGI_GA.TXT files for inform-
 ation on setting up a YGO run.  Any changes to the original YGO release
 (ver. 1.00) will be included in a file named UPDATE.TXT.  Please consult
 that file if it is present.

	YGO is a DOS program that must be run under MS or PC DOS (ver.3.3
 or higher), Compaq DOS (ver.3.31 or higher), or in a DOS window under MS
 Windows 3.0 or higher.  YGO also requires an 80386/87 math coprocessor or
 higher CPU and about 1 MB of RAM.

	This version of YGO is a FREEWARE program.  Its copyright is owned
 by Phadean Engineering Company, Inc., and Phadean gives the user of this
 software permission to freely copy and distribute it, as long as YGO.EXE
 and all associated files are included, and as long as there is no cost to
 the recipient.  Although the FREEWARE version has limited capabilities, it
 can be used to design some very interesting Yagis that cannot be designed
 in any other way.  An unrestricted version of YGO is available for anyone
 who needs greater capabilities - the opening YGO screen provides details.

	Thanks for using YGO!  Your comments and suggestions are welcome,
 and we hope to hear from you.  You can contact us at: Phadean Engineering
 Company, Inc., P.O. Box 611, Shrewsbury, MA 01545-8611 USA  tel.(508) 869-
 6077, fax (508) 869-2890.
 -------------------------- end of file YGO.TXT ------------------------------