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<!-- Manpage converted by man2html 3.0.1 -->
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first - Yagi-Uda project quick antenna builder
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<H2>SYNOPSIS</H2><PRE>
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<B>first</B> filename elements f_min f_design f_max f_step diame-
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<H2>DESCRIPTION</H2><PRE>
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The program <B>first</B> is one of a number of executable programs
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that forms part of a set of programs, collectively known as
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the <I>Yagi</I>-<I>Uda</I> <I>project</I> , which were designed for analysis and
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optimisation of Yagi-Uda antennas. <I>first</I> is used to define
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an antenna quickly, if you are not interested in analysing a
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specific design (in which case use <I>input</I> ) but need to get a
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design that is half-way reasonable so that it may be optim-
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ised. It is much faster in use (since its not interactive)
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than <I>input</I> The design methodology that <I>first</I> is the DL6WU
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antenna designs, which are valid for 10 or more elements,
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although <I>first</I> will calculate for any number of elements.
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DL6WU reccomends a folded dipole, but the designs here are
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for a simple dipole, since I don't yet know how to calculate
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the self and mutual impedances of folded dipoles.
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<H2>LIMITATIONS</H2><PRE>
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Filenames, including full path, can't exceed 90 characters.
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Does not take into account the variation of impedance of a
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dipole with change in wavelength/diameter of elements.
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filename Yagi description, created by first.
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filename.out Binary data file, created by yagi.
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filename.dat Performance of antenna, created by output.
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filename.gai Gain of antenna, created by output.
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The DOS .EXE files as distributed require a 387 maths copro-
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cessor to be present and will not run without it. A 486,
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Pentium, and I assume later processors of this series will
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run it without any extra hardware.
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<H2>PLATFORMS</H2><PRE>
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Both DOS and and Unix versions have been built. The DOS ver-
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sion as distributed requires a 386 PC with a 387 maths
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coprocessor. The DOS version is no longer being developed,
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so the DOS executables included with the distribution are
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not upto date with the current source code.
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Dr. David Kirkby G8WRB (david.kirkby@onetel.net). with help
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with the conversion to the DOS/PC enviroment from Dr. Joe
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Mack NA3T (mack@fcrfv2.ncifcrf.gov)
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<H2>SEE ALSO</H2><PRE>
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<B>input(1)</B>, <B>output(1)</B>, <B>yagi(1)</B>, <B>optimise(1)</B>.
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Bugs should be reported to: David Kirkby G8WRB
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(david.kirkby@onetel.net). Bugs tend actually to be fixed
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if they can be isolated, so it is in your interest to report
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them in such a way that they can be easily reproduced.
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If the input file is edited manually and done incorrectly,
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there can be unpredictable results.
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Options are not checked for sensible numbers. A negative
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length can be entered!
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Man(1) output converted with
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<a href="http://www.oac.uci.edu/indiv/ehood/man2html.html">man2html</a>
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doc/first.1.html
