Hey I'm studying for my nav and not sure if this answer is correct or not
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Hey I'm studying for my nav and not sure if this answer is correct or not
an aircraft at 19,000ft wishes to communicate with a adf at 1,400ftamsl. what us the maximum range at which it is likely to contact?
a. 175nm
b. 216nm
I got the answer as 219, so it has to be option b.
But the book says its a.
A little confirmation really does boost the confidence.
Do reply.
a. 175nm
b. 216nm
I got the answer as 219, so it has to be option b.
But the book says its a.
A little confirmation really does boost the confidence.
Do reply.
Join Date: Nov 2000
Location: White Waltham, Prestwick & Calgary
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Actually, the formula is 1.23 x sq rt H + 1.23 x sq rt h, where H is the height of the aircraft and h the height of the antenna off the gorund. They must be calculated separately - if you add them together first the square root is wrong.
In your case the answer is 215.56 so you are correct, but you may have used 1.25 instead of 1.23. In any case it is the nearest answer.
In fact, the question is wrong in other ways - that formula is for VHF, which an ADF isn't, and it should be an NDB. The ADF is in the aircraft. Also, you don't "communicate" with an NDB!
It's a passive instrument.
In your case the answer is 215.56 so you are correct, but you may have used 1.25 instead of 1.23. In any case it is the nearest answer.
In fact, the question is wrong in other ways - that formula is for VHF, which an ADF isn't, and it should be an NDB. The ADF is in the aircraft. Also, you don't "communicate" with an NDB!
It's a passive instrument.
