Download 'TLW (Transmission Line for Windows)'. Download Document. Read TLW (Transmission Line for Windows) text version TLW (Transmission Line for Windows) Version 2.0, November 6, 2003 Copyright ARRL, 2002-2003, by R. Dean Straw, N6BV For those of you who may be familiar with my older transmission-line program TLA distributed with the 18th Edition of The ARRL Antenna Book, the new TLW is a full-featured upgrade that takes full advantage of the Windows programming environment. Many users during the beta testing phase successfully navigated through all of TLW's many features without the benefit of an instruction manual. Consider the advantage you have, dear reader, since you are now reading the instruction manual! Version 2.0 now includes additional graphing capabilities described below. Computer Requirements The minimum requirements to run TLW (and its companion program YW, Yagi for Windows) are a PC running Windows 95 or later, including Windows 98, Windows XP and Windows 2000. The processor should be at least a Pentium 90 MHz, with at least VGA 640 × 480 screen Page 1 resolution (with 'Small' font size, so you can see the whole window), 24 MB of RAM (32 MB for Windows 2000) and a CD-ROM. Note that a screen resolution of 800 × 600 or even better yet, 1024 × 768, will result in easier-to-read windows. These higher resolutions are best viewed with 'Large' font size. To set the screen size from the Windows Desktop Taskbar, select Start, then Settings, Control Panel, Display and then click on the Settings tab. Choose either 800 × 600 or 1024 × 768 in the Screen Area list box. Next, click on the Advanced button and select 'Large Fonts' in the Font Size list box. Then reboot your computer (if necessary), and exit by clicking on the OK buttons until you can exit the Control Panel folder. A Short History of the TLW Program TLW, short for 'Transmission Line for Windows' started out life as TL, short for just 'Transmission Line.' TL was replaced by TLA, short for 'Transmission Line Advanced.' The core algorithms in TLW have been under development, intermittently, for more than 10 years and the program has developed into a sort of 'Swiss Army Knife' for transmission lines and antenna tuners. TLW does assume that the user has some technical knowledge about transmission lines and antenna tuners. Political book pdf. The user must be familiar with the so-called rectangular representation of complex impedance, in the form Z = R ± j X. Later in this document there are two tables of typical impedance data for two types of antennas. You can use this data with TLW to experiment with realistic situations and to gain familiarity with the program. Installing TLW Normally, you would automatically install TLW when you use ABSETUP to install the other programs from the CD-ROM included with the 20th Edition of The ARRL Antenna Book. This section describes how to re-install TLW, or install it for the first time if you opted not to install it previously. At the lower left-hand of your Desktop, click Start, then Run. Click on the Browse button and then select the drive corresponding to your CD-ROM. We'll assume here that it is drive D. Select the ABSETUP program by clicking on it twice and then clicking OK. Follow the onscreen instructions to enter your name and company, to choose your target directory (the default is c: AntBk20) and then Program Group. When the menu tree 'Select Components to Install' appears, deselect everything except for TLW. Then click OK to start the installation. Afterwards, allow the computer to shut down and reboot. Possible Problems During TLW Installation You may possibly encounter warnings or problems during installation or re-installation of TLW. The program uses DLLs (Dynamic Linked Libraries) and other files (such as OCX ActiveX Controls) supplied from Microsoft for Visual Basic 6, the language in which TLW was written. Microsoft will occasionally update its DLLs and OCXs. If the installation program finds an older file that must be updated, it will ask your permission to do so. It is OK to allow this updating, since older programs that also use these DLLs and OCXs should still work--in other words, they are backwards compatible. On rare Page 2 occasions, however, a newer DLL or OCX will not function with older programs. Should this occur, please contact the publisher of the other program, or contact ARRL for problems with TLW, using the e-mail address at the end of this document. We have found that some auxiliary 'Uninstall' programs can interact with an installation or re-installation of TLW because certain uninstall programs automatically makes DLLs and OCXs 'read-only.' Consult your operator's manual for such uninstall programs if you see a warning message about a 'read-only' file during TLW installation. You will probably have to Cancel your TLW installation and run the auxiliary uninstall program to update its file inventory.
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