November 2000

	YGO3 (Yagi Genetic Optimizer, Ver. 3) is a real-valued genetic
algorithm (GA) that designs optimized Yagi-Uda arrays by maximizing a
user-specified figure-of-merit (FoM).  Antenna designs created by YGO3 
are modeled by NEC-2D (Numerical Electromagnetics Code, Ver. 2, double
precision), a recognized standard for modeling wire antennas developed
at Lawrence Livermore National Laboratory.  YGO3 handles up to 150 ele-
ment arrays at up to 50 frequencies.  The GA includes state-of-the-art
techniques such as quadratic interpolation, auto-grooming, coefficient
perturbation, coefficient activation, several selection methods, and two 
crossover methods.  YGO3 is a DOS program which may be run in a DOS win-
dow under the Windows operating system.

	YGO3 is a FREEWARE program.  It may be copied and distributed
without restriction as long as there is no cost or charge of any kind,
including "tie-in" costs, to the recipient.  YGO3 has been developed and
is distributed as a service to the amateur radio community.  Please email
comments, suggestions, or questions to: ygo3@yahoo.com.

	YGO3 is installed by executing the self-extracting file
YGO3INST.EXE in the default directory, usually C:\YGO3.  All necessary
files are created, including several versions of NEC-2D that allow for
models with 28 to 1500 segments.  Please read the file YGO3_MAN.TXT for
setup and operating instructions.

	YGO3 is the successor program to YGO2, a binary-coded genetic
algorithm for optimizing Yagi arrays.  Because YGO3 includes several
improvements, designers using YGO2 should upgrade to the newer real-valued
GA.