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<meta name="generator" content="HTML Tidy, see www.w3.org">
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<meta name="GENERATOR" content="Bluefish 0.6 and vi on a Sun SPARCstation 20">
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<meta name="Reply-to" content="drkirkby@ntlworld.com">
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<meta name="KEYWORDS" content="transmission lines, tranmission line, CAD, electrical, atlc, impedance, Z0, transmission, line, lines, arbitrary, cross, section, shape, Zo">
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<meta name="DESCRIPTION" content="A finite difference program for computing the properties of any transmission line ">
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<title>atlc - Arbitrary Transmission Line Calculator</title>
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<!-- Manpage converted by man2html 3.0.1 -->
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<H2>SYNOPSIS</H2><PRE>
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<B>atlc</B> <B>[-C]</B> <B>[-s]</B> <B>[-S]</B> <B>[-v]</B> <B>[-c</B> <B>cutoff]</B> <B>[-d</B> <B>rrggbb=Er]</B> <B>[-i</B>
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<B>factor]</B> <B>[-t</B> <B>threads]</B> <B>[-r</B> <B>rate_multiplier]</B> <B>bitmapfile</B>
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<B>factor]</B> <B>[-i</B> <B>prefix]</B> <B>[-t</B> <B>threads]</B> <B>[-r</B> <B>rate_multiplier]</B> <B>bit-</B>
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<H2>WARNING</H2><PRE>
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This man page is not a complete set of documentation. See
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the html files for more complete information. So far, I've
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not managed to install the html files into /usr/local, so
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you will have to look into the atlc-X.Y.Z/docs/html-docs
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This man page is not a complete set of documentation - the
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complexity of the atlc project makes man pages not an ideal
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way to document it, although out of completeness, man pages
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are produced. The best documentation that was current at the
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time the version was produced should be found on your hard
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/usr/local/share/atlc/docs/html-docs/index.html
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although it might be elsewhere if your system administrator
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chose to install the package elsewhere. Sometimes, errors
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are corrected in the documentation and placed at
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http://atlc.sourceforge.net/ before a new release of atlc is
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released. Please, if you notice a problem with the documen-
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tation - even spelling errors and typos, please let me know.
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<H2>DESCRIPTION</H2><PRE>
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<B>atlc</B> is a finite difference programme that is used to calcu-
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<B>atlc</B> is a finite difference program that is used to calcu-
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late the properties of a two-conductor electrical transmis-
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sion line of arbitrary cross section. It is used whenever
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there are no analytical formula known, yet you still require
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The impedance Zo (in Ohms)
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The capacitance per unit length (pF/m)
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The inductance per unit length (nF/m)
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The velocity of propogation v (m/s)
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The velocity of propagation v (m/s)
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The velocity factor, v/c, which is dimensionless.
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A bitmap file (usually with the extension .bmp or .BMP) is
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drawn in a graphics package such as <B>Gimp</B> available from
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http://www.gimp.org. The bitmap file <B>must</B> be saved as a 24-
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bit (16 million colour) uncompressed file. The colours used
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bit (16,777,216 colour) uncompqessed file. The colours used
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in the bitmap indicate whether the region is a conductor
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(pure red, pure green or pure blue) or a dielectric (any-
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thing else). Pure white is assumed to be a vacuum dielec-
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tric, but other colours have diferent meanings. See COLOURS
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tric, but other colours have different meanings. See COLOURS
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below for precise definitions of the colours.
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<H2>OPTIONS</H2><PRE>
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print copyright, licencing and copying information.
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print copyright, licensing and copying information.
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Skip writing the Ex, Ey, E, V, U and Er bitmap (.bmp) files
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makes the output more verbose/talkative.
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<B>-c</B> <B>cutoff</B>
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Sets the convergence criteria of the finite difference pro-
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gramme. The default is 0.0001, meaning two separate itera-
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tions must be within 01% for the programme to stop iterat-
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ing. Setting to a smaller positive number gives more accu-
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racy, but takes longer.
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gram. The default is 0.0001, meaning two separate iterations
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must be within 01% for the program to stop iterating. Set-
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ting to a smaller positive number gives more accuracy, but
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<B>-d</B> <B>rrggbb=Er</B>
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is used to indicate the colour 0xrrggbb in the bitmap is
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<B>-r</B> <B>ratemultiplier</B>
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Sets the parameter 'r' used internally when computing the
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voltage at a point w,h. The default, which is (as of ver-
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sion 3.0.0) 1.95, results in what is belived to be optimal
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sion 3.0.0) 1.95, results in what is believed to be optimal
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results. Setting to 1.0 will avoid the use of the fast con-
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vergence method, which is generally not a good idea.
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<B>-t</B> <B>threads</B>
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tells atlc to run using that number of threads, to speed
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calculation. This option is only valid if atlc was compiled
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with the --with-threads option to configure. The pthreads
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library (or similar) <B>must</B> be installed in order to compile
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with support for more than one CPU. Generally, setting the
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number of threads to the number of cpus is a good idea, but
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it is worth experimenting. The number can be changed per-
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manently by editing the parameter MAX_THREADS in
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<B>-p</B> <B>prefix</B>
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Adds 'prefix', which is usually a directory name, in front
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represent the amount of red, 8 for blue and 8 for green.
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Hence there are 256 levels of red, green and blue, making a
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total of 256*256*256=16777216 colours. Every one of the pos-
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sible i16777216 colours can be defined precisely by the
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stating the exact amount of red, green and blue, as in:
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sible 16777216 colours can be defined precisely by the stat-
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ing the exact amount of red, green and blue, as in:
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red = 255,000,000 or 0xff0000
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green = 000,255,000 or 0x00ff00
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Brown = 255,000,255 or 0xff00ff
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gray = 142,142,142 or 0x8e8e8e
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Some colours, such as pink, terquiose, sandy, brown, gray
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etc may mean slightly different things to different prople.
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This is not so with atlc, as the programme expects the
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colours below to be exactly defined as given. Whether you
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feel the colour is sandy or yellow is up to you, but if you
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use it in your bitmap, then it either needs to be a colour
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reconised by atlc, <B>or</B> you <B>must</B> define it with a command line
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option (see OPTIONS).
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Some colours, such as pink, turquiose, sandy, brown, gray
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etc may mean slightly different things to different people.
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This is not so with atlc, as the program expects the colours
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below to be exactly defined as given. Whether you feel the
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colour is sandy or yellow is up to you, but if you use it in
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your bitmap, then it either needs to be a colour reconised
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by atlc, <B>or</B> you <B>must</B> define it with a command line option
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red = 255,000,000 or 0xFF0000 is the live conductor.
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green = 000,255,000 or 0x00FF00 is the grounded conductor.
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blue = 000,000,255 or 0x0000FF is the negative conductor
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All bitmaps <B>must</B> have the live (red) and grounded (green)
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conductor. The blue conductor is used to indicate a negative
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conductor, is needed when the programme is used to analyse
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conductor, is needed when the program is used to analyse
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directional couplers.
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The following dielectrics are recognised by atlc<B>:</B>
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The following dielectrics are reconised by atlc<B>:</B>
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white 255,255,255 or 0xFFFFFF as Er=1.0 (vacuum)
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pink 255,202,202 or 0xFFCACA as Er=1.0006 (air)
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sandy 239,203,027 or 0xEFCC1A as Er=3.3 (PVC)
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brown 188,127,096 or 0xBC7F60 as Er=3.335 (epoxy resin)
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L. yellow 223,247,136 or 0xDFF788 as Er=3.7 (FR4 PCB)
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Terquoise 026,239,179 or 0x1AEFB3 as Er=4.8 (glass PCB)
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Turquoise 026,239,179 or 0x1AEFB3 as Er=4.8 (glass PCB)
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Dark gray 142,142,142 or 0x696969 as Er=6.15 (duroid 6006)
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L. gray 240,240,240 or 0xDCDCDC as Er=10.2 (duroid 6010)
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D. orange 213,160,067 or 0xD5A04D as Er=100.0 (mainly for
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<H2>EXAMPLES</H2><PRE>
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Here are a few examples of the use of atlc. Again, see the
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html documentation in atlc-X.Y.Z9ocsl-docs for for examples.
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html documentation in atlc-X.Y.Z9ocsl-docs, the documentation
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on your system (normally at
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/usr/local/share/atlc/docs/html-docs/index.html ) or online
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at http://atlc.sourceforge.net for examples.
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<B>ex_1</B> <B>%</B> <B>atlc</B> <B>coax2.bmp</B>
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This is a simple example (ex_1), in which the geometry of a
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2.33, 2.5, 3.3, 3.335, 3.7, 4.8, 6.15 or 10.2) could have
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been used in the bitmap, which would have been done with one
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of 13 different colours. white (0xFFFFFF) for Er=1.0, pink
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(0xFFCACA) for 1.0006 etc. No other colour(dilectric) could
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have been used, since it was not specified with the -d
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(0xFFCACA) for 1.0006 etc. No other colour (dielectric)
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could have been used, since it was not specified with the -d
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<B>ex_2</B> <B>%</B> <B>atlc</B> <B>-d</B> <B>f9e77d=2.43</B> <B>somefile.bmp</B>
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In ex_2, a dielectic with Er=2.43 was wanted. A colour with
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In ex_2, a dielectric with Er=2.43 was wanted. A colour with
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the RGB values of 0xF9E7&d was used. The -d option tells
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atlc what Er this colour refers to.
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<B>ex_3</B> <B>%</B> <B>atlc</B> <B>-v</B> <B>.bmp</B> <B>coax2.bmp</B>
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<B>ex_3</B> <B>%</B> <B>atlc</B> <B>-v</B> <B>coax2.bmp</B>
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In ex_3, atlc has been instructed to print the results of
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intermediate calculations to stdout. Normally, only the
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final result is printed.
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final result is printed. Using -vv even more information may
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be produced, but this is really of only use to the developer
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<B>create_bmp_for_stripline_coupler(1)</B>
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<B>create_bmp_for_symmetrical_stripline(1)</B> <B>design_coupler(1)</B>
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<B>find_optimal_dimensions_for_microstrip_coupler(1)</B> <B>readbin(1)</B>
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http://atlc.sourceforge.net - Home page
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http://sourceforge.net/projects/atlc - Download area
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atlc-X.Y.Z/docs/html-docs/index.html - HTML docs
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atlc-X.Y.Z/docs/qex-december-1996/atlc.pdf - theory paper
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atlc-X.Y.Z/examples - examples
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http://www.david-kirkby.co.uk - my home page
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http://www.david-kirkby.co.uk/ham - ham radio pages
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docs/html-docs/atlc.1.html
