I wonder if the TACAN has to move physically. That may be an old
design. Looking at the portable tacan posted later in the threads, it
doesn't look very mechanical.


Stubby wrote:
Hilton wrote:
Bob Moore wrote:
A VOR

antenna must be permanently aligned to the earth,


Why? Why not have a heading indicator (or DG) to drive the 'angles' (i.e.
phase) it sends out?


An advantage of VORs over TACANs is the VOR antenna does not physically
more, whereas it does in a TACAN. Electronic "rotation" of the antenna
intuitively makes shipboard use easier, but I might not understand ships
enough!