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Antennas_CD-ROM_Walnut_Creek_September_1996.iso
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1996-06-30
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3KB
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54 lines
1 PRINT " ***************************************************************"
2 PRINT " * COLINEAR COAXIAL ANTENNA *"
3 PRINT " * REFERENCE- ARRL FM AND REPEATERS FOR THE RADIO AMATEUR *"
4 PRINT " * ARRL, NEWINGTON, CT O6111 *"
5 PRINT " * PROGRAM BY R.P. HAVILAND, W4MB *"
6 PRINT " * COPYRGHT 1990 *"
7 PRINT " * MINILAB BOOKS, DAYTONA BEACH, FL 32121-1086 *"
8 PRINT " ***************************************************************"
20 DEF FNP(X)=INT(100*X+.5)/100
30 PI=3.1415923#
110 PRINT "A COLINEAR COAXIAL ANTENNA IS COMPOSED OF N SECTIONS OF"
120 PRINT " TRANSMISSION LINE, END TO END ALONG A LINE."
130 PRINT " EACH IS ONE=HALF WAVELENGTH LONG INSIDE THE COAX,"
140 PRINT " WITH A SMALL SPACE BETWEEN OUTER CONDUCTORS FOR CONNECTION."
150 PRINT "AT THE JUNCTION, THE CENTER CODNDUCTOR IS CONNECTED TO THE OUTER"
160 PRINT " CONDUCTOR OF THE ADJACENT SECTION."
170 PRINT " THE END SECTIONS ONLY ARE SHORTED AT THEIR CENTERS, AS:"
210 PRINT " oooosoooo oooosoooo"
220 PRINT " ccccscccccooooooooocccccscccc THIS CONNECTION PLACES"
230 PRINT " oooosoooocccccccccccoooosoooo THE RADIATING CURRENTS"
240 PRINT " ooooooooo IN PHASE."
300 PRINT " FEED CAN BE AT END OF A SECTION BY A BALUN."
310 PRINT " NON-SYMMETRY ABOUT THE FEED POINT GIVES SOME PATTERN DISTORTION."
500 INPUT " PRESS RETURN TO START";T$
800 CLS
1000 INPUT "ENTER DESIGN FREQUENCY, MHZ";FREQ
1010 INPUT "ENTER NUMBER OF COAX SECTIONS TO USE"; NS
1030 INPUT "ENTER VELOCITY FACTOR OF COAXIAL LINE";VF
1200 LAMBDA=11803/FREQ 'INCHES
1210 LAMLIN=LAMBDA*VF
1220 OUTC=LAMLIN/2
1230 SHRT=LAMLIN/4
1240 CCON=OUTC+1
1250 LOA=NS*OUTC+(NS-1)*.5
1260 GAIN=NS*VF
1500 PRINT
1510 PRINT " OUTER CONDUCTOR LENGTH IS";FNP(OUTC);"INCHES"
1520 PRINT " CENTER CONDUCTOR LENGTH IS";FNP(CCON);"INCHES"
1530 PRINT " SHORT END SECTIONS";FNP(SHRT);"INCHES FROM OUTER CONDUCTOR END"
1540 PRINT
1550 PRINT " WITH BEST QUALITY COAX INSULATION,"
1560 PRINT " GAIN IS APPROXIMATELY";FNP(GAIN);"DB"
1600 PRINT
1610 PRINT " IN ASSEMBLY, LEAVE 1/2 INCH SPACING BETWEEN OUTER CONDUCTORS,"
1620 PRINT " AND REMOVE UNCONNECTED PARTS OF END SECTION CENTER CONDUCTORS."
1640 PRINT
1650 PRINT " LENGTH OVEALLL=";FNP(LOA);"INCHES +/- FEED ARRANGEMENT."
1800 PRINT
1810 PRINT "SEAL ALL CONNECTIONS WITH SILICON RUBBER, ETC"
1820 PRINT " OR ENCLOSE ENTIRE ASSEMBLY IN PLASTIC PIPE SEALED AT TOP."
2000 INPUT " ENTER R=RERUN, OTHER =STOP";T$
2010 IF T$="R" GOTO 800
2020 END