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faq.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
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<title>Qucs project: F.A.Q.</title>
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<div id="main">
<hr />
<h3>Frequently asked Questions</h3>
<a href="#q001">1. On which OS will Qucs run?</a><br />
<a href="#q002">2. What kind of software is need to be installed on my system to run Qucs?</a><br />
<a href="#q003">3. Why don't you use Spice to simulate the schematics?</a><br />
<a href="#q004">4. How can I set the language for Qucs?</a><br />
<a href="#q005">5. Qucs does not start on my MacOSX. What's wrong?</a><br />
<a href="#q006">6. I try to run the ASCO optimizer and it gave
me the following error: 'qucsator' is not recognized as an
internal or external command, operable program or batch
file.</a><br />
<a href="#q007">7. I use the Windows version of Qucs. After
installing it, I can't use it when logged in as different user.
Simulation cannot be started, projects are away and/or icons
don't appear properly in the GUI. What's wrong?</a><br />
<a href="#q008">8. What do I do if my question isn't answered
here?</a><br />
<h3>Answers</h3>
<p><a name="q001" id="q001"><b>1. On which OS will Qucs
run?</b></a><br />
Qucs is currently developed on GNU/Linux systems using the GNU
autotools (and CMake experimentally).
For this reason it is very likely that Qucs runs on
all kinds of Unix systems supporting an appropriate system
interface and an installed Qt® environment. It has been
verified that Qucs can be installed on GNU/Linux, Solaris 2.9,
MacOS 10.5, NetBSD, FreeBSD and Cygwin (Unix emulation layer
for Windows).
Qucs is
also available natively on x86 Windows (XP/Vista/7/8) systems
and experimentaly on x86_64 versions of these. </p>
<p><a name="q002" id="q002"><b>2. What kind of software is need
to be installed on my system to run Qucs?</b></a><br />
Currently Qt4 (version 4.6 and higher) are known to work well.
To compile qucs you will need some additional packages like
qt4-dev-tools, bison, flex, gperf and adms-2.3.0 (included into Qucs)</p>
<p><a name="q003" id="q003"><b>3. Why don't you use Spice to
simulate the schematics?</b></a><br />
There are several debatable reason for this. When looking at
the Spice3f.5 source code (i.e. the last version with technical
support from the University of California) it seems like the
program was made as a proof of concept rather than a ready to
use application. In fact the code is not easy to extend though
possibly reliable and tested for a great variaty of schematics.
The original Spice misses a S-parameter and harmonic balance
simulation which may be necessary for microwave engineers, thus
Spice would not be an all-in-one solution. Of cource there are
trillions of derivates of the last official Spice version
extending and bug-fixing it: but which shall we use? Last but
not least the licence issue. The copyright holder for the Spice
code are the Regents of the University of California. The code
comes for free but isn't in fact meant to be re-used.<br />
<br />
Some more restriction of Spice3f.5</p>
<ul>
<li>limited number of nodes and devices (student
version)</li>
<li>though implemented and possibly ready-to-use the
integration order (for the Gear formulae) won't exceed 2 in
the transient simulation code</li>
<li>there are no such components as phaseshifter, isolator,
circulator, microstrip components, etc.</li>
<li>the frontend isn't as good as it could be</li>
</ul>
<p><a name="q004" id="q004"><b>4. How can I set the language
for Qucs?</b></a><br />
If you want to change the language for the Qucs GUI you need to
quit Qucs and then</p>
<pre>
$ export LANG=de
</pre>for German for example. Then start Qucs again. Also you can
change the language in the application settings dialog (in the file
menu).
<p><a name="q005" id="q005"><b>5. Qucs does not start on my
MacOSX. What's wrong?</b></a><br />
Please contact the developers. Provide details and if available a
crash report.</p>
<p><a name="q006" id="q006"><b>6. I try to run the ASCO
optimizer and it gave me the following error: 'qucsator' is not
recognized as an internal or external command, operable program
or batch file.</b></a><br />
The optimizer ASCO runs the 'qucsator' program to perform
optimizations. Therefore the 'qucsator' program which is the
backend simulator for Qucs needs to reside in the program PATH
environment.<br />
<br />
Under GNU/Linux or similar do</p>
<pre>
$ export PATH=$PATH:/path/to/qucsator
</pre>On Win32 systems go to "Start", "Settings", "System
properties", click on "Advanced" tab. In the "Advanced" section
click the "Environment Variables" button. There edit or add the
<tt>PATH</tt> environment variable to point to the path where
'qucsator.exe' resides.
<p><a name="q007" id="q007"><b>7. I use the Windows version of
Qucs. After installing it, I can't use it when logged in as
different user. Simulation cannot be started, projects are away
and/or icons don't appear properly in the GUI. What's
wrong?</b></a><br />
Don't panic! Under Windows environment variables are used to
steer "relocation", meaning how a program knows where it
resides. During installation these environment variable are set
up. These are user specific (even when installed as
"Administrator"). If you want to use Qucs two variables are
most important: <tt>QUCSDIR</tt> and <tt>HOME</tt>.<br />
<br />
<tt>QUCSDIR</tt> specifies where qucs is installed. On Win32
systems go to "Start", "Settings", "System properties", click
on "Advanced" tab. In the "Advanced" section click the
"Environment Variables" button. There edit or add the
<tt>QUCSDIR</tt> environment variable to point to the path Qucs
is installed (e.g., <tt>C:\Programs\Qucs</tt>).<br />
<br />
The <tt>HOME</tt> variable is used to identify where settings
and project data are stored. Even for network drives you can
let point it to e.g. <tt>H:\</tt>. In this folder a directory
<tt>.qucs/</tt> is created and used to store project related
files.</p>
<p><a name="q008" id="q008"><b>8. What do I do if my question
isn't answered here?</b></a><br />
You may go through the <a href=
"http://sourceforge.net/mail/?group_id=90337">mailing list
archive</a>. If that doesn't help, <a href=
"contact.html">contact us</a>.</p>
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