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first(1)


NAME

   first - Yagi-Uda project quick antenna builder

SYNOPSIS

   first filename  elements f_min f_design f_max f_step diameter

DESCRIPTION

   The  program 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 don't yet know how to calculate
   the self and mutual impedances of folded dipoles.

LIMITATIONS

   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.

FILES

   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.

PLATFORMS

   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 source code.

AUTHORS

   Dr. David Kirkby G8WRB (david.kirkby@onetel.net).  with help  with  the
   conversion   to   the   DOS/PC  environment  from  Dr.  Joe  Mack  NA3T
   (mack@fcrfv2.ncifcrf.gov)

SEE ALSO

   input(1), output(1), yagi(1), optimise(1).

BUGS

   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!



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