                        YAGI GENETIC OPTIMIZER
                        ----------------------

	YGO is a FREEWARE progarm.  It may be freely copied and
 distributed, but ONLY as long as there is no cost to the recipient.

	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.

	To install YGO, copy the file INST_YGO.EXE into the directory on your
 hard drive that you will use for YGO.  YGO files are created by executing
 INST_YGO.EXE, which is a self-extracting EXE file.  If you have a previous
 version of YGO, simply overwrite all files of the same name.

	Be sure to check the README.TXT and YAGI_GA.TXT files for inform-
 ation on setting up a YGO run.  The file NEC2INFO.TXT contains information
 on creating various size NEC-2D executables.  Any changes to YGO will be
 described in the file UPDATE.TXT.  Please read UPDATE.TXT 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 (depending on the model size).

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