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GW-BASIC | 1987-02-21 | 3.4 KB | 52 lines |
- 10 ' All of the programs on this disk are freeware and in the public
- 20 'domain. They may be freely copied and used but are not to be sold.
- 30 'All of the equations used to generate the graphs produced by the
- 40 'programs named QMAX, QCORR, and INSLOSS, were derived independently
- 50 'by myself and the results checked against similar graphs which can be
- 60 'found in the literature. The correlations are quite close. They were
- 70 'done simply because it is more convenient to be able to call necessary
- 80 'data up on the screen than it is to cart textbooks and paperwork around.
- 90 '
- 100 ' The equations used in the DATABAS and CAVDES programs were derived
- 110 'from Eq. 28-15 on page 774 of the textbook entitled Very High Frequency
- 120 'Techniques by the Harvard Radio Research Laboratory, edited by Herbert
- 130 'J. Reich, and published by Boston Technical Publishers in 1965.
- 140 '
- 150 ' The DATABAS program is principally for the purpose of generating the
- 160 'values used by the KTHETA program to produce the graph showing the loop
- 170 'center location and the minimum relative bandwidth as functions of the
- 180 'tuning range. All four of the above graphs have counterparts of the same
- 190 'name preceded with a 'P' which are for the purpose of reproducing those
- 200 'graphs on paper with a Sweet-P plotter. This is a quite common machine
- 210 'but the programs should not be difficult to convert for use with another
- 220 'type. The graphs will each require a standard eight and a half by eleven
- 230 'sheet of paper. Printouts of these graphs are very useful for making
- 240 'preliminary estimates as to the practicality of a particular design
- 250 'without having to wait for access to a computer system.
- 260 '
- 270 ' The CAVDES program, however, is the real thing. When you have the
- 280 'required design parameters in hand then all you will have to do is to
- 290 'answer the questions about the end frequencies, mid-frequency Q value,
- 300 'cavity dimensions, characteristic impedances, and loading, and it will
- 310 'give you all the answers.
- 320 ' Whether or not the end results will be satisfactory will depend, of
- 330 'course, on a great number of things. All electronic equations are only
- 340 'approximations to begin with; at low frequencies the results can be very
- 350 'accurate but even at frequencies of 5-10 mHz they can be noticeably
- 360 'affected by circuit strays such as parasitic capacitances and inductances.
- 370 'It should be borne in mind that devices such as coaxial vavities are very
- 380 'sensitive to such things as surface finish, plating depth, the type of
- 390 'joint formed by the center post and the shorting plane, the structure of
- 400 'the tuning mechanism, etc. There is no guarantee, therefore, that the
- 410 'use of the CAVDES program will be the answer to all your prayers but it
- 420 'should fill a gap that has existed for too long.
- 430 '
- 440 ' If you find that these programs are very useful in your work I would
- 450 'appreciate it if you mailed me a check for ten dollars. This would in no
- 460 'way compensate me for the time I have put in on the project but it would
- 470 'help to defray the cost of the computer system.
- 480 '
- 490 ' Robert F. Arnesen, P.E.
- 500 ' 9340 E. Magdalena Drive,
- 510 ' Tucson, Arizona. 85710-6623
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