An aircraft at FL100 should be able to receive a VOR ground station at 100 ft above MSL at an approximate maximum range of..
The VHF Omni-Range (VOR) station uses Very High Frequency (VHF) radiowaves to transfer in1formation.
The formulae used to calculate the range of these radio waves is as follows:
Maximum theoretical range (in nm) = 1.23 x √H1 + 1.23 x √H2
H1 = the height in feet of the transmitter above mean sea level (MSL).
H2 = the height in feet of the receiver above mean sea level (MSL).
Knowing that:
H1 = 10.000 ft
H2 = 100 ft
Filling in the formulae gives the following:
Max range = 1.23 x √10.000 + 1.23 x √100 = 123 +12.3 = 135 nm
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