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<PRE>
<!-- Manpage converted by man2html 3.0.1 -->
</PRE>
<H2>NAME</H2><PRE>
first - Yagi-Uda project quick antenna builder
</PRE>
<H2>SYNOPSIS</H2><PRE>
<B>first</B> filename elements f_min f_design f_max f_step diame-
ter
</PRE>
<H2>DESCRIPTION</H2><PRE>
The program <B>first</B> is one of a number of executable programs
that forms part of a set of programs, collectively known as
the <I>Yagi</I>-<I>Uda</I> <I>project</I> , which were designed for analysis and
optimisation of Yagi-Uda antennas. <I>first</I> is used to define
an antenna quickly, if you are not interested in analysing a
specific design (in which case use <I>input</I> ) but need to get a
design that is half-way reasonable so that it may be optim-
ised. It is much faster in use (since its not interactive)
than <I>input</I> The design methodology that <I>first</I> is the DL6WU
antenna designs, which are valid for 10 or more elements,
although <I>first</I> will calculate for any number of elements.
DL6WU reccomends a folded dipole, but the designs here are
for a simple dipole, since I don't yet know how to calculate
the self and mutual impedances of folded dipoles.
</PRE>
<H2>LIMITATIONS</H2><PRE>
Filenames, including full path, can't exceed 90 characters.
Does not take into account the variation of impedance of a
dipole with change in wavelength/diameter of elements.
</PRE>
<H2>FILES</H2><PRE>
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 copro-
cessor 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.
</PRE>
<H2>PLATFORMS</H2><PRE>
Both DOS and and Unix versions have been built. The DOS ver-
sion 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 source code.
</PRE>
<H2>AUTHORS</H2><PRE>
Dr. David Kirkby G8WRB (david.kirkby@onetel.net). with help
with the conversion to the DOS/PC enviroment from Dr. Joe
Mack NA3T (mack@fcrfv2.ncifcrf.gov)
</PRE>
<H2>SEE ALSO</H2><PRE>
<B>input(1)</B>, <B>output(1)</B>, <B>yagi(1)</B>, <B>optimise(1)</B>.
</PRE>
<H2>BUGS</H2><PRE>
Bugs should be reported to: David Kirkby G8WRB
(david.kirkby@onetel.net). 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 entered!
</PRE>
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