Dme

[uwochris]

Hey guys,

I know that the basic operation of DME is as follows: a/c transeiver sends out a signal to a ground station; the ground station then sends a signal back to the a/c, but on a different frequency, which is used to calculate the distance based on the time elapsed with transmission and receipt.

What I don't understand is why does the ground station send out the signal to the a/c on a different frequency? Why can't it use the same frequency that the a/c transeiver sent?

Thanks in advance.

 

[Mr Wu]

Interference, like putting a microphone beside a speaker.

 

[Turkey Shoot]

Have you ever heard what it osunds like when two people key up at the same time on the same freq? Two freqs avoid that.