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JCSM Shareware Collection 1993 November
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JCSM Shareware Collection - 1993-11.iso
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cl760
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schartj.lzh
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README
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1992-03-20
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82 lines
SCHART
SMITH CHART IMPEDANCE MATCHING PROGRAM
V2.1 Copyright (C) 1990, 1992
by
Lynn A. Gerig
R.R.#1, 6417 Morgan Road
Monroeville, IN 46773
This program is distributed under the Shareware concept. It is available for
anyone to try without obligation. If you find this program useful, you are
asked to register your use of it. ALL COMMERCIAL USERS MUST REGISTER! For
the registration fee of $25.00 you will receive a disk with the latest version
of this program, a VHF propagation program, and an HF propagation program. A
printed MANUAL containing documentation for all the programs and the source code
will also be included. Send $30.00 for air mail delivery outside the USA.
A description of an earlier version of this program can be found in Oct '84 HAM
RADIO magazine, Jun '85 RF DESIGN magazine, and May '87 COMMUNICATIONS magazine.
Type SCHART <return> to run the Smith Chart program.
SCHART is an impedance matching program with Smith Chart Graphics. It is an
MS-DOS version of a 10-year old program originally written for the HP-9830 then
the Commodore-64. Given a starting or "load" impedance, the program calculates
new input impedances for any combination of passive matching elements you
choose. Outputs are listed in tabular form with resistive and reactive values
given for each frequency of operation.
For those wishing to graphically analyze the impedances as a function of
frequency, a graphics option is included which draws a Smith Chart in high
resolution graphics and plots the impedances. The CGA graphics option was
written in BASICA and will run on any computer which can run graphics from
BASIC. On most computers this means you are using the "IBM color card" or
"CGA" equivalent with a monochrome composite video monitor or an RGB monitor.
You cannot do compiled BASIC graphics on a TTL monitor with a monochrome text
card. If you can't run the graphics, select Option "1" on the first menu and
you can still use the program with all its equations--you just won't be able
to plot a Smith Chart on your screen.
Note. Version 2 includes a new option which goes beyond "BASIC graphics."
This version, written in and compiled from TURBO BASIC or POWER BASIC, will now
display graphics and plot your Smith Charts on a Hercules graphics card. In
addition, EGA and VGA cards will display the CGA graphics.
I originally developed the program on a Zenith 158, then slightly modified it
for compatibility with a variety of machines. I have personally used it on
IBM XT & AT computers and a great variety of clones (XT/AT/386/486, etc.).
Text dumps to printer should work with any printer. For high resolution
graphics screen dumps, it will be necessary to run the appropriate DOS utility
for your hardware configuration before running SCHART. On an IBM or Compaq this
will most likely be GRAPHICS.COM. For high resolution dumps to my Panasonic
(Epson compatible) printer from my Zenith 158 computer, I run PSCMX80.COM when
in CGA mode and HERC.COM (typing HERC PRINTER) when using my Hercules graphics
card. I have personally used it successfully with IBM, Panasonic, Epson, and
Gemini printers.
Help keep shareware alive. Register your use of this product to help support
the development of future shareware programs. Send $25.00 to the address above
and get a copy of the latest version of this and 2 other programs, complete with
a printed manual giving a full description of the program.