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what distance will they loose VHF contact?

   
Author Message
Arina
Guest





Posted: Sun Aug 12, 2012 9:29 am 

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]
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jrocky
Trainee
Trainee

Pro Member

Joined: Dec 30, 2009
Posts: 69
Location: South St Paul, MN (KSGS)
Posted: Sun Aug 12, 2012 1:17 pm 

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."
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Arina
Guest





Posted: Mon Aug 13, 2012 9:15 am 

thank you!!! Smile
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