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Antennas_CD-ROM_Walnut_Creek_September_1996.iso
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qdloop.asc
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1996-06-30
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2KB
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42 lines
100 CLS : PRINT " ***********************************"
110 PRINT " * QUAD ANTENNA LOOPS *"
120 PRINT " * NEAR RESONANCE *"
130 PRINT " * EMPIRICAL APPROXIMATIONS *"
140 PRINT " * PROGRAM COPYRIGHT 1985 *"
150 PRINT " * R.P.HAVILAND,W4MB *"
160 PRINT " ***********************************"
170 REM PROGRAM 14
190 DEF FNP (X) = INT(100 * X + .5) / 100
200 PRINT " CURRENT QUAD THEORY REQUIRES"
210 PRINT " THE POWER OF A LARGE COMPUTER"
220 PRINT " USE CIRCULAR LOOP FOR ESTIMATES"
230 PRINT " USE NEC FOR ACCURATE ANAYLSIS"
240 PRINT " OR MININEC FOR CLOSE APPROXIMATIONS"
250 PRINT : PRINT
300 INPUT "ENTER DESIGN FREQUENCY, MHZ"; FO
310 INPUT "ENTER ELEMENT DIAMETER, INCHES"; DI: PRINT
320 LA = 984 / FO
330 DL = LA * 12 / DI
340 EF = 1 + .053 * (LOG(DL) / 2.3 - 3.06)
350 EL = LA * EF
400 PRINT "ELEMENT LENGTH FACTOR="; FNP(EF)
410 PRINT "ELEMENT LENGTH ="; FNP(EL); " FEET"
420 PRINT "LOOP SIDE="; FNP(EL / 4); " FEET"
430 PRINT "LOOP GAIN = 3.2 DBI": PRINT
440 PRINT "THE DRIVE IMPEDANCE OF AN ISOLATED LOOP IS 128+/-5 OHMS"
450 PRINT "THE CHANGE IN REACTANCE FOR A SMALL DEPARTURE FROM RESONANCE IS "
460 PRINT FNP(12.55 * (LOG(DL) / 2.3 - 2)); "OHMS/PERCENT CHANGE IN LENGTH"
470 PRINT
500 PRINT "FOR MULTI-ELEMENT DESIGNS USE"
510 PRINT "ELEMENT SPACING="; FNP(.15 * LA); " FEET"
520 PRINT "REFLECTOR SIDE="; FNP(1.1 * EL / 4); " FEET"
530 PRINT "DIRECTOR SIDE="; FNP(.95 * EL / 4); " FEET": PRINT
540 PRINT "SPACINGS OF"; FNP(.12 * LA); "TO"; FNP(.2 * LA); "FEET CAN BE "
545 PRINT "USED WITH SMALL CHANGE IN GAIN."
550 PRINT
1000 PRINT "PRESS R TO RERUN, ANY OTHER KEY FOR MENU"
1010 Q$ = INKEY$: IF Q$ = "" GOTO 1010
1020 IF Q$ = "R" OR Q$ = "r" THEN RUN
1030 END