For non-isotropic radiators such as parabolic antennas, headlights, and lasers, the effective origin is located far behind the beam aperture.
22.
The first national signals to a network of twenty ground downlink stations each equipped with a parabolic antenna in diameter.
23.
The large parabolic antennas, known locally as " Mickey's ears ", were replaced with the current two-antenna setup in 1991.
24.
Some parabolic antennas transmit or receive at multiple frequencies by having several feed antennas mounted at the focal point, close together.
25.
A typical parabolic antenna consists of a metal parabolic reflector with a small feed antenna, which converts it into radio waves.
26.
With the advent of home satellite television receivers, parabolic antennas have become a common feature of the landscapes of modern countries.
27.
The same radio with an external semi parabolic antenna ( 15 dB gain ) might have a range over 20 miles.
28.
The orbiter consisted of a cylinder with two solar panel wings and a high gain parabolic antenna attached to the curved surface.
29.
The antenna can be regarded as a form with a gain intermediate between a plane reflective array antenna and a parabolic antenna.
30.
Customers will be able to receive Galaxy programming through rooftop parabolic antennas with the signal continuing to individual apartments through existing cabling.
