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HamCall (October 1991)
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BASIC Source File
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1990-10-14
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4KB
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86 lines
10 CLS
20 CLEAR 2000
30 REM: VHF POWER DENSITY CALCULATION PROGRAM
40 REM: BASED ON POWER DENSITY CALCULATION, PG. 9 OF OST 65
50 REM: BY TERRENCE M. BAUN
60 REM: Originally written for TRS-80 III adapted for MSDOS GWBASIC 01/87
70 PRINT:PRINT:PRINT:PRINT:PRINT:PRINT:
80 PRINT " F.M. POWER DENSITY CALCULATION PROGRAM"
90 PRINT " FOR DETERMINING COMPLIANCE WITH ANSI C95.1-1982"
100 PRINT:PRINT " Ver. 1.2B"
110 FOR ZZ= 1 TO 6000
120 NEXT ZZ
130 CLS:CLEAR
140 RA=0:QR$="N"
150 PRINT "This program will calculate the power density at a particular distance"
160 PRINT "from an FM broadcast array when the ERP and the distance to the desired"
170 PRINT "point from the C/R of the antenna are known."
180 PRINT
190 PRINT " REMEMBER, THE FCC LIMIT IS 1.0 MILLIWATT/CM SQUARED."
200 PRINT
210 PRINT "Enter the ERP (in Watts) for one polarization of your antenna:" :INPUT PW
220 PRINT
230 PRINT "Enter the distance from your antenna C/R to the desired power density"
240 PRINT "location (in Meters):":INPUT DS
250 PRINT
260 DR=DS*100
270 PR=PW*2
280 S=.64*1.64*PR*1000
290 A=(DR*DR)*3.1416
300 RF=S/A
310 EG=DS*3.28
320 PRINT " The power density for "PW "Watts at "DS "Meters ("EG"feet) at a"
330 PRINT " vertical radiation angle of "RA" degrees is:"
340 PRINT
350 PRINT " "RF "MILLIWATTS/CM SQUARED."
360 PRINT
370 IF RF>1 THEN PRINT " W A R N I N G ! ANSI LIMITS WILL BE EXCEEDED AT THIS POINT!": GOTO 390
380 PRINT " RADIATION AT THIS POINT IS WITHIN ANSI STANDARDS."
390 IF QR$="Y" THEN GOTO 520 ELSE 400
400 PRINT
410 PRINT "NOTE: THIS PROGRAM ASSUMES 100% RADIATION IN ALL PLANES. POWER DENSITY"
420 PRINT "CAN BE MORE PRECISELY CALCULATED FOR A PARTICULAR VERTICAL RADIATION"
430 PRINT "ANGLE IF THE ANTENNA MANUFACTURER'S VERTICAL PLANE RELATIVE FIELD DATA IS KNOWN."
440 PRINT "------------------------------------------------------------ -------------------"
450 PRINT "Do you wish to refigure using the antenna manufacturer's vertical plan radiation data? (Y/N)"
460 INPUT QR$
470 IF QR$="Y" THEN PRINT "What is the depression angle of interest? (Horizontal equals 0 degrees)" ELSE 520
480 INPUT DA: RA=DA
490 PRINT "What is the vertical plane relative field for your antenna at "DA" degrees?":INPUT FF
500 PRINT
510 RF=(RF*FF): GOTO 320
520 PRINT: PRINT "Do you wish a printed analysis? (Y/N)" : INPUT QP$
530 IF QP$="Y" THEN GOSUB 580
540 PRINT "Do you wish to calculate the power density at another point? (Y/N)": INPUT Q$
550 IF Q$="Y" THEN CLS: GOTO 230
560 PRINT "Do you wish to run this program again with all new parameters? (Y/N)" :INPUT QS$
570 IF QS$="Y" THEN CLS: GOTO 130: ELSE CLS: END
580 PRINT "Enter your call letters:":INPUT RS$
590 LPRINT:LPRINT:LPRINT "POWER DENSITY CALCULATION FOR "RS$
600 LPRINT "BASED ON 'WORST CASE' VALUES FROM OST #65"
610 LPRINT "-----------------------------------------"
620 LPRINT "A POINT THAT IS "DS "METERS ("EG "FEET) FROM THE C/R OF"
630 LPRINT "A"PW "WATT ARRAY AT A VERTICAL RADIATION ANGLE OF "RA" DEGREES IS"
640 LPRINT
650 LPRINT "========> " RF "MILLIWATT/CM SQUARED <========"
660 LPRINT
670 LPRINT "THE MAXIMUM ALLOWABLE FCC LIMIT IS 1.O MW/CM SQUARED."
680 FCC= 1!: SV=RF/FCC*100
690 LPRINT "THE EXPECTED POWER DENSITY AT "DS "METERS WILL BE "SV" % OF THE"
700 LPRINT "MAXIMUM ALLOWABLE UNDER THE RESTRICTIONS MANDATED BY ANSI C95.1-1982."
710 IF SV>100 GOTO 720 ELSE 790
720 LPRINT:LPRINT
730 LPRINT "*****************************************"
740 LPRINT "* W A R N I N G " *
750 LPRINT "* ANSI RADIATION STANDARDS WILL BE *"
760 LPRINT "* EXCEEDED AT THIS DISTANCE! *"
770 LPRINT "*****************************************"
780 LPRINT:LPRINT:LPRINT
790 RETURN
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