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- WA9GFR RF ENGINEERING SOFTWARE DISK 1C
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- V2.0 Copyright (C) 1987
-
- by
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- Lynn A. Gerig
-
- R.R.#1, 6417 Morgan Road
- Monroeville, IN 46773
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- This disk is placed in the Public Domain and distributed under the Shareware
- concept. It is available for anyone to try without obligation. If you find
- these programs useful, you are asked to register your use of them. All
- commercial users MUST register.
-
- ALL PROGRAMS ON THIS DISK ARE TOTALLY MENU DRIVEN FOR EASE OF USE WITHOUT THE
- NEED FOR SEPARATE INSTRUCTIONS. The assumption is made, however, that the user
- of the Smith Chart program is already familiar with impedance matching
- networks, and that the user of the propagation programs is familiar with the
- associated terms. A complete manual will be furnished to all who register.
-
- For the registration fee of $15.00 you will receive a disk with the latest
- version of all the programs, complete documentation for those who desire
- further information, and a copy of the source code for those who wish to modify
- the programs for their own applications.
-
- SCHART is a Smith Chart impedance matching program. It is a new IBM version of
- an 8-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.
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- 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 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 the proper option 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.
-
- 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
- Zenith, IBM PC-XT, Compaq, and PC's Limited Turbo PC computers.
-
- Text dumps to printer should work with any printer. If you desire high
- resolution graphics screen dumps, it will be necessary to run the appropriate
- file for your hardware configuration from DOS before running SCHART. On an IBM
- or Compaq this will most likely be GRAPHICS.COM. To enable high resolution
- dumps to my Panasonic (Epson compatible) printer from my Zenith 158 computer, I
- run PSCMX80.COM. I have personally used it successfully with IBM, Panasonic,
- Epson, and Gemini printers.
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- The HFPROP program will predict expected ground-wave communications ranges (in
- miles) from 3.5 to 50 MHz based upon inputs of frequency, transmitter power,
- receiver sensitivity, antenna parameters, and type of terrain. Data are based
- upon the classical "Bell Labs Curves" (declassified after WW2).
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- The VHFPROP program predicts expected communications ranges (in nautical and
- statute miles) from 100 MHz to 3.5 GHz based upon inputs of frequency,
- transmitter power, receiver sensitivity, and antenna parameters. Data are
- included for ground-to-ground, ground-to-air, and air-to-air applications plus
- free-space line-of-sight information useful for satellite communications
- predictions. Data are based upon propagation curves found in ESSA TECHNICAL
- REPORT ERL 111-ITS 79 (available from Government printing offices).
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- Type SCHART <return> to run the Smith Chart program.
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- Type VHFPROP <return> to run the VHF Propagation program.
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- Type HFPROP <return> to run the HF Propagation program.
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- Remember, a disk with the latest versions of these programs, source code, and
- complete documentation are available for a registration fee of $15.00.
-