VOR&NDB navigation (about dual needle RMI)
Hope this is the right subforum, as there is no NAVIGATIONAL topic on this forum.
NDB transmitter transits none directional signal and onboard equipment determine the direction to it so it has directional antennas that is mechanicaly or electronicaly rotated and where the signal is most powerfull there is the direction towards NDB (it really measures weakest signal and add 180°)
And VOR transmitter has two antennas one thas in none directional and second directional that is electronical rotated for 360° - meaning that there is 360 radials each representing one degree of a circle. None directional antenna transmits the VHF signal only when the radial is passing 360 or 0°. And on board VOR equipment count the time between directional and nondirectional signal thus determine on which radial you are.
Back to the thread...
I played FSX where you have planes with dual needle RMI (I know that FSX is simulation and not a reall thing), but beside ADF needle - showing the direct direction to engaged NDB, there are also a second needle showing direct direction to VOR transmitter not second NDB.
So how can RMI's VOR needle shows direction to VOR? Does it work the same as ADF, and you need extra antenna?