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GW-BASIC | 1986-07-10 | 1.0 KB | 27 lines |
- 1 REM Data taken from article in April 1982 QST by John S. Belrose, VE2CV
- 2 REM Program written by Marv Hayes, NF6G, 3/20/83.
- 90 PRINT "These calculations are for a 'J' antenna made from 300 ohm"
- 91 PRINT "twin-lead such as Belden 8230 with a velocity factor of .8"
- 95 PRINT " "
- 100 INPUT "Please enter the design frequency in mHz";FREQ
- 105 PRINT " "
- 200 LAMBDA = 11811/FREQ
- 300 STUB = 0.83 * LAMBDA / 4
- 400 RADIATOR = 0.965 * LAMBDA / 2
- 500 TAP = LAMBDA * 0.0136
- 600 GAP = 0.25
- 1000 PRINT "DESIGN LENGTH OF LENGTH OF TAP GAP"
- 1100 PRINT " FREQ 1/4 WAVE RADIATOR DISTANCE DISTANCE"
- 1200 PRINT "(mHz) (inches) (inches) (inches) (inches)"
- 1300 PRINT " "
- 1400 PRINT FREQ, STUB, RADIATOR, TAP, GAP
- 1890 PRINT " "
- 1900 PRINT "If this antenna will be inclosed inside a PVC plastic tube,"
- 1901 PRINT "the dimensions should be reduced (multiply by 0.95)."
- 1905 PRINT " "
- 1910 STUB = STUB * 0.95
- 1920 RADIATOR = RADIATOR * 0.95
- 1930 TAP = TAP * 0.95
- 1950 PRINT FREQ, STUB, RADIATOR, TAP, GAP
- 2000 END
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