Manual Reference Pages - FIRST (1)
first - Yagi-Uda project quick antenna builder
first filename elements f_min f_design f_max f_step diameter
first is one of a number of executable programs that forms part of a set of
programs, collectively known as the
Yagi-Uda project , which were designed for analysis and optimisation of Yagi-Uda antennas.
first is used to define an antenna quickly, if you are not interested in analysing a specific design (in which case use
input ) but need to get a design that is half-way reasonable so that it may be optimised. It is much faster in use (since its not interactive) than
input The design methodology that
first is the DL6WU antenna designs, which are valid for 10 or more elements, although
first will calculate for any number of elements. DL6WU reccomends a folded dipole, but
the designs here are for a simple dipole, since I dont yet know how to calculate
the self and mutual impedances of folded dipoles.
Filenames, including full
path, cant exceed 90 characters.
Does not take into account the variation of impedance of a dipole with
change in wavelength/diameter of elements.
filename Yagi description, created by first.
filename.out Binary data file, created by yagi.
filename.dat Performance of antenna, created by output.
filename.gai Gain of antenna, created by output.
The DOS .EXE files as distributed require a 387 maths coprocessor to be
present and will not run without it. A 486, Pentium, and I assume later
processors of this series will run it without any extra hardware.
Both DOS and and Unix versions have been built. The DOS version as
distributed requires a 386 PC with a 387 maths coprocessor. The DOS version is no longer being
developed, so the DOS executables included with the distribution are not upto date with the current
Dr. David Kirkby G8WRB (firstname.lastname@example.org).
with help with the conversion to the DOS/PC enviroment from Dr. Joe Mack NA3T (email@example.com)
input(1), output(1), yagi(1), optimise(1).
Bugs should be reported to:
David Kirkby G8WRB (firstname.lastname@example.org).
Bugs tend actually to be fixed if they can be isolated, so it is in your
interest to report them in such a way that they can be easily reproduced.
If the input file is edited manually and done incorrectly, there can be unpredictable results.
Options are not checked for sensible numbers. A negative length can be
|Version 1.10 ||FIRST (1) ||Fri Dec 2 1994 |
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