Our XY pedestal is ideal for tracking satellites in Low-Earth Orbits (LEOS) because it completely eliminates the problem of the overhead keyhole more reliably and less expensively than a three-axis system.
I just can’t understand what is “overhead keyhole”. Is it a term used in installation or something else?
I do not know but wonder if it doesn't mean a blind spot, giving donut-shaped coverage but not right in the middle, that may (or may not) be habitual with this kind of antenna.
The following statement comes from the same vendor:
The systems’ X/Y axis configuration eliminates the keyhole (lost data) effect that occurs with other tracking antennas when satellites pass directly overhead.
It is clear what the term means, but why this issue?