Provided by: yagiuda_1.19-5_i386 bug

NAME

       output - output data file formats

DESCRIPTION

       This  manual  page describes the output formats of the files created by
       the Yagi-Uda project’s output program. The files are ASCII file, so can
       be analysed with any graph plotting program.

Example of a .dat File

       Below is a typical .dat file, for a 4ele 144-146MHz beam, optimised for
       a huge (and useless) FB.

       # Driven=1 parasitic=3 total-elements=4 design=145.000MHz
       # Checked from 144.000MHz to 146.000MHz.
       f(MHz) E(deg) H(deg) R       jX   VSWR  Gain(dBi)  FB(dB) SideLobes(dB)
       144.000 54.7  71.5  44.47  -2.35  1.136  9.386     21.944     16.650
       144.500 54.0  70.1  41.34  -0.75  1.210  9.553     27.244     17.153
       145.000 53.2  68.4  37.55   1.61  1.335  9.742    103.055     17.777
       145.500 52.3  66.6  33.26   5.00  1.530  9.947     25.734     18.547
       146.000 51.3  64.6  28.77   9.63  1.832 10.149     18.919     18.919

What is what in the .dat file

       The f(MHz) column is the frequency (MHz) at which the data is evaluated
       at.
       The  E(deg)  column is the approximate 3dB E-plane bandwidth calculated
       to the nearest 0.1 degree.
       The H(deg) column is the approximate 3dB H-plane  bandwidth  calculated
       to the nearest 0.1 degree.
       The (R) column is the input resistance in Ohms.
       The (jX) column is the  input reactance in Ohms.
       The (VSWR) column is the input VSWR, usually refered to a 50 Ohm input,
       but this may be changed.
       The Gain (dBi) column is the gain at theta=90  degrees,  which  is  the
       forward direction of the beam. It is possible that a higher gain occurs
       at other than 90 degrees, but this  is  not  taken  into  account.  The
       antenna is seriously at fault if this occurs.
       The FB(dB) column is the front to back ratio in dB.
       The  Sidelobes(dB) column is the minimum level in dB down from the peak
       gain of any sidelobe. This is not calculated unless the ’-c’ option  is
       used, and then only on some optimisation techniques.

Example of a .gai File

       The following is a small section of the .gai file.
       f(MHz)     theta  gain-E(dBi) G(E)-peak   phi   gain-H(dBi) G(H)-peak
       144.0000 -90.0000  -12.5584   -21.9444 -180.0000 -12.5584  -21.9444
       144.0000 -45.0000   -7.3507   -16.7367 -135.0000  -3.5971  -12.9830
       144.0000   0.0000 -999.0000 -1008.3860  -90.0000  -0.9010  -10.2870
       144.0000  45.0000    0.1848    -9.2012  -45.0000   4.0261   -5.3599
       144.0000  90.0000    9.3860     0.0000    0.0000   9.3860    0.0000
       144.0000 135.0000    0.1848    -9.2012   45.0000   4.0261   -5.3599
       144.0000 180.0000 -999.0000 -1008.3860   90.0000  -0.9010  -10.2870
       144.0000 225.0000   -7.3507   -16.7367  135.0000  -3.5971  -12.9830
       144.0000 270.0000  -12.5584   -21.9444  180.0000 -12.5584  -21.9444

What is what in the .gai file

       The f(MHz) column is the frequency in MHz.
       The  theta  column  is  the angle theta, for which the next two columns
       refer.
       The gain-E(dBi)  is  the  gain  at  theta,  relative  to  an  isotropic
       radiator.   This  is  the E-plane gain. Hence at the peak (theta), this
       gives the peak forward gain.
       The G(E)-peak is the gain at theta, relative to the peak gain. Hence at
       the peak (theta=90 degrees), this is zero.
       The phi column has nothing to do with the previous 3 columns. It is the
       angle for which the next two columns refer.
       The gain-H(dBi) is the gain at phi, relative to an isotropic  radiator.
       This  is  the  H-plane  gain. Hence at the peak (phi=0), this gives the
       peak forward gain.
       The G(H)-peak is the gain at phi, relative to the peak gain.  Hence  at
       the peak (phi=0 degrees), this is zero.

Example of a .up File

       The  .up  file  list  the  improvements  made by optimise to an antenna
       design. Starting from the original design, the file  is  appended  each
       time  a new better design is found. Here is an example, where the final
       line is the performance of the 4ele  beam  with  the  .dat  file  shown
       earlier.
           1 7.57dBi,  16.93dB F/B, Z=(31.77-56.34j) Ohms, VSWR=3.95, SL=16.95 dB
          84 7.58dBi,  16.93dB F/B, Z=(31.78-56.32j) Ohms, VSWR=3.95, SL=16.95 dB
         623 7.58dBi,  16.93dB F/B, Z=(31.78-56.28j) Ohms, VSWR=3.95, SL=16.95 dB
       89345 9.74dBi, 103.06dB F/B, Z=(37.55 +1.61j) Ohms, VSWR=1.33, SL=17.78 dB

What is what in the .up file

       The  first  column  is  an  integer specifying the iteration. The other
       columns, going from left to right are gain(dBi), FB,  input  impedance,
       VSWR and level of the most significant sidelobe, in dB down on the peak
       gain.

SEE ALS0

       yagi(1), output(1), input(1), optimise(1), first(1) and yagi(5).

AUTHORS

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