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Antennas_CD-ROM_Walnut_Creek_September_1996.iso
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w4mb
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vol2
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clsa.asc
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1996-06-30
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4KB
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87 lines
2 ON ERROR GOTO 60000
3 CLS
10 PRINT " **************************************************************"
20 PRINT " * CYLINDER SLOT ANTENNA *"
30 PRINT " * REFERENCE - RSGB VHF-UHF MANUAL *"
40 PRINT " * PROGRAM BY R.P. HAVILAND, W4MB *"
50 PRINT " * COPYRGHT 1990 *"
60 PRINT " * MINILAB BOOKS, DAYTONA BEACH, FL 32121-1086 *"
70 PRINT " **************************************************************"
80 DEF FNP(X)=INT(100*X+.5)/100
90 PI=3.141592
100 INTM=1/39.37
200 PRINT
210 PRINT " THE CYLINDER SLOT PRODUCES AN ESSENTIALLY
220 PRINT " ONNI-DIRECTIONAL HORIZONTALLY POLARIZED"
230 PRINT " SIGNAL WHEN MOUNTED WITH THE CYLINDER AXIS VERTICAL"
240 PRINT " THE SLOT IS PARALLEL TO THE CYLINDER AXIS"
250 PRINT " CYLINDER WALLS ARE ASSUMED TO BE VERY THIN,"
260 PRINT " AND CAN BE SHEET METAL OR MESH"
400 PRINT
410 INPUT " ENTER OPERATING FREQUENCY, MHZ";FO
420 IF FO=<0 THEN 400
430 LAM=299.8/FO
440 PRINT " WAVELENGTH=";FNP(LAM);"METERS"
450 PRINT " =";FNP(LAM/INTM);"INCHES"
460 FRAT=146.2/FO
600 SLEN=58*FRAT
610 BWID=1*FRAT
620 LOA=60*FRAT
630 DIA=10*FRAT
640 SHTW=31*FRAT
650 FP=14*FRAT
660 SWID=1*FRAT
1000 PRINT
1010 PRINT " SLOT LENGTH=";FNP(SLEN*INTM);"METERS"
1020 PRINT " =";FNP(SLEN);"INCHES"
1030 PRINT " END BRIDGES=";FNP(100*BWID*INTM);"CM"
1040 PRINT " =";FNP(BWID);"INCHES"
1050 PRINT " CYLINDER LOA=";FNP(LOA*INTM);"METERS"
1060 PRINT " =";FNP(LOA);"INCHES"
1070 PRINT " CYLINDER DIAMETER=";FNP(DIA*INTM);"METERS"
1080 PRINT " =";FNP(DIA);"INCHES"
1090 PRINT " SLOT WIDTH=";FNP(100*SWID*INTM);"CM"
1100 PRINT " =";FNP(SWID);"INCHES"
1110 PRINT " CONDUCTOR WIDTH, BEFORE FORMIING=";FNP(SHTW*INTM);"METERS"
1120 PRINT " =";FNP(SHTW);"INCHES"
1130 PRINT " FEED POINT, FROM LOWER END OF CYLINDER=";FNP(100*FP*INTM);"CM"
1140 PRINT " =";FNP(FP);"INCHES"
1150 INPUT " PRESS RETURN TO CONTINUE";T$
1160 PRINT
1200 PRINT " IF DIMENSIONS ARE INCONVENIENT, DESIGN FOR SLIGHTLY HIGHER FREQUENCY,"
1210 PRINT " AND PLACE A FEW PF OF VARIABLE CAPACITY ACROSS SLOT"
1220 PRINT " AT CYLINDER CENTER (A HIGH VOLTAGE POINT)"
1230 PRINT
1240 PRINT " FEED IMPEDANCE=";288;"OHMS, BALANCED"
1250 PRINT " FOR 200 OHM BALANCED FEED, FEED POINT"
1260 PRINT " IS APPROXIMATELY";FNP(FP*200/288*INTM);"METERS FRON END"
1270 PRINT " OR ABOUT";FNP(FP*200/288);"INCHES FROM END"
1500 INPUT "ENTER R= RERUN, P= PRINTOUT, Q= QUIT";T$
1510 IF T$="R" THEN 400
1520 IF T$="P" THEN 2000
1530 IF T$<>"Q" THEN 1500
1540 END
2000 LPRINT " CYLINDER-SLOT ANTENNA"
2010 LPRINT " SLOT LENGTH=";FNP(SLEN*INTM);"METERS"
2020 LPRINT " =";FNP(SLEN);"INCHES"
2030 LPRINT " END BRIDGES=";FNP(100*BWID*INTM);"CM"
2040 LPRINT " =";FNP(BWID);"INCHES"
2050 LPRINT " CYLINDER LOA=";FNP(LOA*INTM);"METERS"
2060 LPRINT " =";FNP(LOA);"INCHES"
2070 LPRINT " CYLINDER DIAMETER=";FNP(DIA*INTM);"METERS"
2080 LPRINT " =";FNP(DIA);"INCHES"
2090 LPRINT " SLOT WIDTH=";FNP(100*SWID*INTM);"CM"
2100 LPRINT " =";FNP(SWID);"INCHES"
2110 LPRINT " CONDUCTOR WIDTH, BEFORE FORMING=";FNP(SHTW*INTM);"METERS"
2120 LPRINT " =";FNP(SHTW);"INCHES"
2130 LPRINT " FEED POINT, FROM LOWER END OF CYLINDER=";FNP(FP*INTM);"METERS"
2140 LPRINT " =";FNP(FP);"INCHES"
2150 LPRINT " FEED IMPEDANCE=";288;"OHMS, BALANCED"
2160 LPRINT " FOR 200 OHM BALANCED FEED, FEED POINT"
2170 LPRINT " IS APPROXIMATELY";FNP(FP*200/288*INTM);"METERS FRON END"
2180 LPRINT " OR ABOUT";FNP(FP*200/288);"INCHES FROM END"
2190 LPRINT
2200 GOTO 1500
60000 PRINT "ERROR";ERR;"AT LINE";ERL
60010 STOP