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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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4pvy.asc
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1996-06-30
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3KB
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54 lines
3 CLS
10 PRINT " ****************************************************************"
20 PRINT " * THE W2PV FOUR ELEMENT YAGI *"
30 PRINT " * REFERENCE- MYERS, QST, OCTOBER 1986 *
40 PRINT " * PROGRAM BY R.P. HAVILAND, W4MB *"
50 PRINT " * COPYRIGHT 1990 *"
60 PRINT " * MINILAB BOOKS, DAYTONA BEACH, FL 32121-1086 *"
70 PRINT " ****************************************************************"
80 DEF FNP(X)=INT(1000*X+.5)/1000
90 PI=3.141592
100 PRINT " THIS PROGRAM GIVES PRIMARY DIMENSIONS FOR A FOUR ELEMENT YAGI ANTENNA"
110 PRINT " HAVING A GAIN OF 9.6 DBI, AND A BANDWIDTH OF ABOUT 1.5 PERCENT FOR"
120 PRINT " FOR A F/B RATIO OF 20 DB OR BETTER.
130 PRINT " USE TAPER AND SCALE PROGRAMS TO ADJUST ELEMENT LENGTHS IF"
140 PRINT " ELEMENT DIAMETER IS CHANGED.
150 PRINT
200 INPUT " ENTER DESIGN FREQUENCY, MHZ";FREQ
210 LAMBDA=984/FREQ
300 PRINT
310 PRINT " DESIGN ELEMENT DIAMETER=";FNP(.001*12*LAMBDA);"INCHES
320 PRINT " FOLLOWING DIMENSIONS ARE IN FEET"
330 PRINT
340 PRINT " ELEMENT LENGTH SPACING DISTANCE FROM REFLECTOR"
350 PRINT " REFLECTOR ";FNP(.5070001*LAMBDA),,0
360 PRINT ,,FNP(.1235*LAMBDA)
370 PRINT " RADIATOR ";FNP(.475*LAMBDA),, FNP(.1235*LAMBDA)
380 PRINT ,,FNP(.2005*LAMBDA)
390 PRINT " DIRECTOR ";FNP(.465*LAMBDA),, FNP(.324*LAMBDA)
400 PRINT ,,FNP(.2495*LAMBDA)
410 PRINT " DIRECTOR ";FNP(.448*LAMBDA),, FNP(.5735*LAMBDA)
500 PRINT
510 PRINT " DRIVE IMPEDANCE IS 20 +j0 OHMNS AT THE DESIGN FREQUENCY"
520 PRINT " USE A GAMMA MATCH OR SEE REFERENCE FOR HAIRPIN MATCH"
600 INPUT " ENTER 1=PRINT OUT, 2=NEW FREQUENCY, 3= QUIT";T$
610 IF T$="3" THEN STOP
620 IF T$="2"THEN CLS:GOTO 200
630 IF T$<>"1" THEN 600
700 LPRINT " W2PV FOUR ELEMENT YAGI FOR";FREQ;"MHZ"
710 LPRINT "DESIGN ELEMENT DIAMETER=";FNP(.001*12*LAMBDA);"INCHES
720 LPRINT " FOLLOWING DIMENSIONS ARE IN FEET"
730 LPRINT
740 LPRINT " ELEMENT LENGTH SPACING DISTANCE FROM REFLECTOR"
750 LPRINT "REFLECTOR ";FNP(.5070001*LAMBDA),,0
760 LPRINT ,,FNP(.1235*LAMBDA)
770 LPRINT "RADIATOR ";FNP(.475*LAMBDA),, FNP(.1235*LAMBDA)
780 LPRINT ,,FNP(.2005*LAMBDA)
790 LPRINT "DIRECTOR ";FNP(.465*LAMBDA),, FNP(.324*LAMBDA)
800 LPRINT ,,FNP(.2495*LAMBDA)
810 LPRINT "DIRECTOR ";FNP(.448*LAMBDA),, FNP(.5735*LAMBDA)
820 LPRINT
830 LPRINT " USE TAPER AND SCALE PROGRAMS TO ADJUST ELEMENT LENGTHS IF"
840 LPRINT " ELEMENT DIAMETER IS CHANGED.
900 GOTO 600