The parabolic dish of a TVRO antenna serves to maximize reception by doing what?

The parabolic dish of a TVRO antenna serves to maximize reception by doing what?

• A. Focus the signal onto the focal point for maximum reception
• B. Create a wider beam
• C. Square off signals
• D. Increase noise

Answer: (A)

A parabolic dish works by acting as a parabolic reflector, turning incoming essentially parallel signals into a concentrated one at its focal point. By placing the feed horn (and LNB) at that focus, the dish captures and directs the energy into a strong, focused signal, boosting the received power. This concentration increases antenna gain and directivity, which improves the signal-to-noise ratio for the satellite signal. In other words, the geometry ensures all the reflected waves add up coherently at the feed, making reception as strong as possible. If the beam were widened, directivity would drop and it would be harder to lock onto the satellite. The dish isn’t about squaring signals or increasing noise; its purpose is to collect as much useful signal as possible from a specific direction.

A parabolic dish works by acting as a parabolic reflector, turning incoming essentially parallel signals into a concentrated one at its focal point. By placing the feed horn (and LNB) at that focus, the dish captures and directs the energy into a strong, focused signal, boosting the received power. This concentration increases antenna gain and directivity, which improves the signal-to-noise ratio for the satellite signal. In other words, the geometry ensures all the reflected waves add up coherently at the feed, making reception as strong as possible. If the beam were widened, directivity would drop and it would be harder to lock onto the satellite. The dish isn’t about squaring signals or increasing noise; its purpose is to collect as much useful signal as possible from a specific direction.