"Teacherjh" wrote in message ...

The VOR signal out of the receiver is a 9960Hz sine wave that is AM
modulated at 30Hz and FM modulated at 30Hz. The phase difference
between the AM and FM signals is the bearing to the station.


How does that work. =Something= has to be directional, no?

Yes, one of the two signals is swept directionally either by electronic or
mechanical means (it doesn't matter which one as long as they are moving
in the right direction relative to the other).