View Full Version : Effective Range of an ELT?

11th Apr 2002, 10:17
Was asked by ATC last night to listen for an ELT on 121.5. We could hear it and it was quite weak and then it increased in signal strength and drifted back down into the noise.

What's the effectice range of an ELT? :confused:

Mirkin About
11th Apr 2002, 11:51
About 80nm for an aircraft at 10,000 ft

seat 0A
11th Apr 2002, 12:07
Like any vhf transmission:
1,2 times the square root of the flightaltitude in feet.

What you get is the range in NM.

That would give you 120 NM at 10000ft

This is the theoretical range, in practise it will probably be less.

(80NM ;) )