Man Linux: Main Page and Category List


       first - Yagi-Uda project quick antenna builder


       first filename  elements f_min f_design f_max f_step diameter


       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.


       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.


       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 source code.


       Dr. David Kirkby G8WRB (  with help  with  the
       conversion   to   the   DOS/PC   enviroment  from  Dr.  Joe  Mack  NA3T


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


       Bugs    should    be    reported     to:     David     Kirkby     G8WRB
       (   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