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QRZ! Ham Radio 8
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antcalc.bas
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BASIC Source File
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1987-11-14
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975b
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33 lines
'ANTCALC.BAS
'Antenna height calculations
PRINT "Software by: Bob Giese, N5KXN"
PRINT " P. O. Box 7681"
PRINT " Houston, TX 77270"
'
'Calculations based on a sphere with approximately
'the same area as the International ellipsoid.
'
'This program uses exact geometric distances not the approximate
'formula appearing in ARRL literature. The radio propagation is then
'computed from the estimate that the radio horizon will be 1/3 longer.
'
R=6378388#*(1#-1#/(3#*297#)) 'This is the radius in meters
F=R*39.37#/12# 'This is radius in U. S. survey feet
F2=F*F 'This is F squared
CLS
again:
INPUT"Enter height in feet of first antenna(0 to stop)";H1
IF H1<=0 THEN STOP
D1=SQR((H1+F)^2-F2)
INPUT"Enter height in feet of second antenna";H2
D2=SQR((H2+F)^2-F2)
D=(D1+D2)/5280#
IF D<0 THEN D=0
PRINT "Geometric line of site distance is ";D;"miles."
PRINT "Ideal radio line of site propagation is";D*4/3;"miles."
PRINT
GOTO again
END