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Antennas_CD-ROM_Walnut_Creek_September_1996.iso
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jpol.asc
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1996-06-30
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2KB
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42 lines
3 CLS
10 PRINT " ***************************************************************"
20 PRINT " * J-POLE ANTENNAS *"
30 PRINT " * R.P. HAVILAND, W4MB *"
40 PRINT " * PROGRAM COPYRGHT 1990 *"
50 PRINT " * MINILAB BOOKS, DAYTONA BEACH, FL 32121-1086 *"
70 PRINT " ***************************************************************"
80 DEF FNP (X) = INT(1000 * X + .5) / 1000
90 MTI = 39.37
200 PRINT : PRINT " THIS PROGRAM IS BASED ON MININEC ANALYSIS"
210 PRINT
220 INPUT "ENTER DESIGN OPERATING FREQUENCY, MHZ "; FREQ
230 FF = 70.8 / FREQ
300 JLONG = 3 * FF
310 SHORT = FF
320 SEP = .1016 * FF
330 DIA = .0508 * FF
500 PRINT
510 PRINT " GENERAL J-POLE ARRANGEMENT IS"
520 PRINT
530 PRINT " xooooooooooooooooooooooo"
540 PRINT " xooooooo"
560 PRINT
600 PRINT " LONG ARM LENGTH="; FNP(JLONG); "METERS, OR"; FNP(JLONG * MTI); "INCHES"
610 PRINT " SHORT ARM LENGTH="; FNP(SHORT); "METERS, OR"; FNP(SHORT * MTI); "INCHES"
620 PRINT
630 PRINT " ARM SEPARATION="; FNP(SEP); "METERS, OR"; FNP(SEP * MTI); "INCHES"
640 PRINT " ARM DIAMETER="; FNP(DIA); "METERS, OR"; FNP(DIA * MTI); "INCHES"
650 PRINT
660 PRINT " FEED IMPEDANCE AT xx IS 11 OHMS"
670 PRINT " FOR 50 OHM COAX USE 4:1 BALUN FOR LOW SWR"
680 PRINT " OR STRAP XX TOGETHER AND TAP LINE UP ARMS"
690 PRINT " APPROXIMATELY"; FNP(SEP); "METERS, OR"; FNP(SEP * MTI); "INCHES"
700 PRINT " SMALL CHANGES IN DIAMETER OR SPACING WILL NOT AFFECT PERFORMANCE"
710 PRINT " FOR APPRECIABLE CONDUCTOR AND SPACING CHANGES,"
720 PRINT " USE MININEC TO GUIDE DESIGN."
800 PRINT
810 INPUT " ENTER R FOR RERUN, OTHER= QUIT"; T$
820 IF T$ = "R" THEN 220
830 END