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what distance will they loose VHF contact?

Arina Guest

hey guys,
im learning now to my RT test, and i have question for you that i have no idea how to answer it Sad

Two airplanes leave Haifa for navigation flight over the sea within Nicossia FIR both cruise a 3000 f AMSL on departing track at what distance will they loose VHF contact:

a. 83.07Nm
b. 134.19 NM
c. 94.88NM
d. 115.65 NM

in the answers they marked b', i tried to do it with this Formula: D=K^H (D=1.23^3000) and that is wrong...

help me please, thank you !!!
Arina Very Happy [/b]

Pro Member Trainee
jrocky Trainee

Arina wrote:

hey guys,
im learning now to my RT test, and i have question for you that i have no idea how to answer it Sad

Two airplanes leave Haifa for navigation flight over the sea within Nicossia FIR both cruise a 3000 f AMSL on departing track at what distance will they loose VHF contact:

a. 83.07Nm
b. 134.19 NM
c. 94.88NM
d. 115.65 NM

in the answers they marked b', i tried to do it with this Formula: D=K^H (D=1.23^3000) and that is wrong...

help me please, thank you !!!
Arina Very Happy [/b]

Found searching, http://aerostudents.com/files/avionics/avionicsFullVersion.pdf "4.1.2 Propagation of radio waves
Normally, electro-magnetic waves simply travel in a straight line. Therefore, they only allow so-called
line-of-sight navigation: you can only navigate using beacons you can actually see. It is now important
to know over what distance we can see beacons. This range R can be found, using the equation
R = 1.2
p
hT + 1.2
p
hR. (4.1.3)
In this equation, R is the range in nautical miles, hT is the transmitter height in feet and hR is t he
receiver height in feet. (These units are important. The above equation won’t work for other units.) For
flying aircraft, the range is often roughly 200 nautical miles."

Arina Guest

thank you!!! Smile

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