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OUTPUT(5)		      File Formats Manual		     OUTPUT(5)

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  an-
       tenna 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 re-
       fer.
       The gain-E(dBi) is the gain at theta, relative to an  isotropic	radia-
       tor.   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 de-
       sign. 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 col-
       umns, 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 con-
       verting to DOS from Dr. Joe Mack	NA3T (mack@fcrfv2.ncifcrf.gov).

Version	1.16		       24th October 2000		     OUTPUT(5)

NAME | DESCRIPTION | Example of a .dat File | What is what in the .dat file | Example of a .gai File | What is what in the .gai file | Example of a .up File | What is what in the .up file | SEE ALS0 | AUTHORS

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