#
# Calculate the dimensions of and the resonant frequency of
# a half-wave dipole's antenna elements
#
# 468
# F = ------------
# L
#
# 468
# L = ------------
# F
#
#def frequency(length):
# return 468/length
#
#def length(frequency):
# return 468/frequency
#
menuSelect = ''
print("\n")
print("Half-Wave Dipole Calculations\n")
#
invalidMenu = False
while invalidMenu == False:
print("\n")
print("[F] --- Calculate resonant frequency from length")
print("[L] --- Calculate length from resonant frequency")
print("[Q] --- Quit")
menuSelect = input("Select: ")
menuSelect = menuSelect.lower()
#
if (menuSelect == 'f' or menuSelect == 'l' or menuSelect == 'q'):
invalidMenu = True
else:
print("Please select a valid menu entry...")
#
# print(menuSelect)
#
if (menuSelect == 'q'):exit
elif (menuSelect == 'f'):
l = input("Enter dipole's length in feet: ")
print("Resonant frequency: {0} MHz".format(468/float(l)))
#
elif (menuSelect == 'l'):
f = input("Enter dipole's resonant frequency in MHz: ")
print("Length: {0} feet".format(468/float(f)))
else:
print("ERROR")
exit

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