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RF Workbench™ FAQs

RF Workbench v4.0a ReadMe file.
August 25, 2001
---------------------------------------------------------------------------
** CONDITIONS OF USE **

RF Workbench 4.0a is a Barterware(tm) edition of TxRx Designer.

Copyright (c) 1999
by
Kirt Blattenberger
1639 Westbridge Drive
Erie, PA  16506


Use of this software implies that the user agrees to hold harmless Kirt Blattenberger and his business and personal affiliates in connection with this software.

You are permitted to use RF Workbench free of charge. Distribution is encouraged. RF Workbench is fully protected by U.S. copyright laws. No change may be made to the program or its documentation.

If you are running Windows Vista and are having issues with running DOS programs, please take a look at this Windows Vista TechCenter page on the MS website. It appears to do a good job of answering questions and providing.


Although a $25 donation is requested , feel free to send a larger
amount - or even a material donation such as books, hardware, test
equipment, or legal software. My interests include full scale and
model airplanes, so items pertaining to those activities will also be
graciously accepted. Thank you.

Please send donations to:

Kirt Blattenberger
1639 Westbridge Drive
Erie, PA  16506


"Barterware" is a registered trademark of Waypoint Software & RF Cafe.
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** INSTALLATION **
UnZipping rfwb40a.zip should have created the directory structure that is required for RF Workbench to run. If not, then launch "install.bat", which will create the directories under the c:\rfwb40 directory. After the install program has been run, you may move the entire \rfwb40
directory structure anywhere you please.

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** LAUNCHING **
Launch rfwb40.exe. An overlay file named rfwb40.ovr is included which must be in the same directory as rfwb40.exe.
---------------------------------------------------------------------------

** RFWB.BAT PARAMETERS **
rfwb.bat is no longer required to launch RF Workbench 4.0a.
---------------------------------------------------------------------------

** HISTORY **
RF Workbench 4.0a is the Barterware version of TxRx Designer, a highly successful effort that was sold commercially for many years. An extensive user's manual was available for TxRx Designer that doubled as a tutorial on RF system design. The level of detail of the on line help should make the manual unnecessary. However, if you would like a manual, I will make one available for $25 (U.S. & Canada), or $30 elsewhere.

RF Workbook 4.0a corrects the run time error 200 message that was occurring when version 4.0 was run on some high speed processors. The problem was due to a flaw in the Borland CRT unit that was fixed by a third party vendor.
---------------------------------------------------------------------------

** MOUSE sitting in the upper left corner? **
RF Workbench requires a DOS mouse driver to function. If you are running from Windows, you must assure that a DOS mouse driver is loaded prior to starting Windows. The following modification to your autoexec.bat file will do the job: .

--> <drive>:\<path to DOS mouse driver>\mousewin.
---------------------------------------------------------------------------

** HINTS **
If you think RF Workbench should be capable of performing a task, but cannot figure out how to do it, refer to the extensive on line help. Here are a few of the most frequently asked questions that are answered:

Q. How do I restore the graph scales that were saved with the system file?
A. Immediately after loading the file, select "Restore Last Scale" from the "Graph" menu (Alt+G,Alt+R).

Q. Can I use the mouse to zoom in on the graph scale?
A. Yes, there are four modes for zooming. While in the graph area, use Alt+F to zoom only the frequency scale, Alt+L to zoom only the power level scale, Alt+D to zoom only the group delay scale, or Alt+A to zoom all of the scales at once.

Q. How do I print the graph while the cursor is in the graph area?
A. Use Alt+P to open the print dialog window.

Q. Can the scales of the Spur Web chart be changed manually?
A. No, autoscaling is performed by RF Workbench.

Q. How many conversion stages can RF Workbench handle?
A. Effectively infinite since preceding stage output data is used as input data for the succeeding stage.

Q. I need more than seven components before or after the mixer stage. How do I model the other components?
A. The simplest method would be to combine two or more cascaded components and enter them on one line. To calculate parameter values for the combinations, simply enter the values into an empty GAIN block dialog window and then transfer the cascaded values into the line in your actual system GAIN dialog window. If you are running RF Workbench from Windows, launching another instance of
RF Workbench to use specifically for combining components will be most convenient. Another method would be to use the stage as a no conversion stage by setting the LO for 0.001 Hz. The mixer can be set for conversion loss and NF of 0, and intercept points and P1dB of +500 to effectively remove it from the system. The extremely small LO frequency will usually not noticeably affect the system frequencies.
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** MIXER FILES **
The *.mf3 mixer files included with RF Workbench are example files provided as a basis for establishing a library of mixer model files.

Quantities recorded in the provided files originate from the manufacturer's data sheets. If the data sheet did not include a particular single tone spur product suppression value, then the worst case RF harmonic value was used to fill in the unspecified values in the table. Actual tests will need to be performed if precise values are required.

In all cases, the spur suppression levels and all other parameters in the supplied mixer model files should be verified by the user prior to basing design decisions on the tables. Some manufacturers specify parameters relative to the input while others specify relative to the output. See the RF Workbench help screens for instructions on input-to-output or output-to-input conversions.

** INITIAL PARAMETERS **
The "initsys.sf3" file that is created the first time RF Workbench is launched has all component gains set for 0 dB with P1dB, IP3, and IP2 set to +250 dBm.
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RF Workbench v4.0a will prove to be one of the most useful design aides that you will ever use. Short of employing an expensive CAE program no greater value can be found. I can only continue to provide such high quality software if every copy used is supported by a contribution to my effort. Your comments and suggestions will be greatly appreciated.

Thank you.

Sincerely,
Kirt Blattenberger
Owner
rfcafe@yahoo.com
 
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