Provided by: yagiuda_1.19-7_amd64 bug

NAME

       output - Yagi-Uda project antenna display program

SYNOPSIS

       output [ - cehps ] [ -EE_max ] [ -HHmax ] [ -rminimum ] [ -Rmaximum ] [ -ZZo ]

       filename

DESCRIPTION

       The  program  output 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.   output  calculates  the gain, FB ratio, input
       impedance etc etc of an antenna that was described by the program input or first  and  has
       had the element currents calculated with the program yagi The data about the forward gain,
       VSWR, FB ratio, input impedance etc is written to a file filename.dat Angular data, giving
       the variation of gain with theta and phi is put into a file filename.gai
       Sometimes  the  program  fails to find the 3dB bandwidths in the E and H planes, and bombs
       out with a 'zbrent' error. This can occur if:
       (1) The antenna has an almost isotropic pattern, in which case its never 3dB down, so  the
       3dB point is undefined.
       (2) The 3dB point is outside the assumed angular range.  You then have to either:
       (a) Calculate with the -e option, which avoids calculation of the 3dB E-plane beamwidth or
       (b)  Do (a) above, then find approximately where the 3dB point is (from the .gai file -see
       later), then set options -E and -H so the program calculates them properly.

       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. The DOS files are no longer being maintained, so are out of
       sync with the latest source.

OPTIONS

       -c     Calculate  the maximum level of any sidelobe - not just the rear on as the FB ratio
              tells us. If the sidelobe and FB ratio are equal, it means the biggest sidelobe  is
              the  rear one. If the Sidelobe is less than the FB ratio, then another lobe is more
              significant. Look in the '.gai' file (see below) to see where it  is.  This  option
              slows the program quite a bit.

       -e     Suppress  calculation  of the 3dB E-plane bandwidth. This is sometimes necessary if
              the programme is unable to find the 3 dB beamwidth, to prevent an error occuring.

       -h     Suppress calculation of the 3dB H-plane bandwidth. This is sometimes  necessary  if
              the programme is unable to find the 3 dB beamwidth, to prevent an error occuring.

       -p     Put  data  into  a file filename.freq for reading into gnuplot, and a commmand file
              filename.gc  for  gnuplot  to  use.  (run  'output  -p  filename'   then   'gnuplot
              filename.gc' )

       -s     Suppress all diagnostic output. By default, the program print the percentage of the
              job completed.

       -EE_max
              When the program computes the E-plane 3dB beamwidth, it assumes the antenna pattern
              is  3dB  down  somewhere  in  the  range  90 to Emax, where E_max is by default 179
              degrees. This can fail if it is never 3dB down in the range, or if it  happened  to
              go 3dB down in two or more points. You can change E_max, if you need to, but rarely
              if every should need to. I've never seen a failure here, but are  guarding  against
              one.  If  you dont want the pattern, use the -e option instead, which skips it. See
              also '-H' below.

       -HH_max
              When the program computes the H-plane 3dB beamwidth, it assumes the antenna pattern
              is 3dB down somewhere in the range 0 to Hmax, where H_max is by defualt 60 degrees.
              This can fail if it is never 3dB down in the range, or if it happended  to  go  3dB
              down in two or more points. Also, if it goes more than 3dB down, but that starts to
              come up again. You can change H_max, if you need to, as  failures  do  occasionally
              occur. If you dont want the pattern use -h option instead, which will skip it.
              An  obvious  example of an antenna where you cant find the 3dB bandwidth for the H-
              plane is the 1ele dipole. The radiation is symmetrical about its axis, so the level
              is the same everywhere in the H plane. The program automatically avoids calculating
              it for a 1 ele beam.

       -ZZo   Zo is the characteristic impedance used when calculating the VSWR. By default  it's
              50 Ohms, but can be changed to any real, positive value.

        filename
              is the name of the file containing the antenna description. It is expected to be in
              a format created by input or first - two other programs in  the  Yagi-Uda  project.
              The  is  also  expected  to exist a binary file filename.out created by typing yagi
              filename

Limitations

       I'm not aware of any limitations, apart from that filenames, including  full  path,  can't
       exceed 90 characters.

FILES

       filename        ASCII file with antenna description.
       filename.out    Binary data file, created by yagi.
       filename.dat    ASCII file with gain, FB ratio etc.
       filename.gai    ASCII file with angular dependence of gain.

SEE ALSO

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

PLATFORMS

       Both  DOS and Unix versions have been built. The DOS version as distributed requires a 386
       PC with a 387 maths coprocessor.

BUGS

       Bugs should be reported to 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.  The program gives errors if element lengths are well  away  from  a
       half-wave  (by  a factor of ~3) due to a breakdown in the equations.  If the input file is
       edited manually and done incorrectly, there can be unpredictable results.

AUTHORS

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