| Feedhorn |
Website Links For Feed |
Information AboutFeedhorn |
| CATEGORIES ABOUT FEED HORN | |
| radio frequency antenna types | |
| satellites | |
|
The feedhorn also selects the Polarity of the waves to be received, which helps to Attenuate unwanted Signal s from Adjacent Channel s and Transponder s, and from other Communications Satellite s at nearby Orbital Position s. This can be either Horizontal or Vertical if the polarization is Linear , or Clockwise or counterclockwise (also called left- and right-handed) if it is Circular . Certain devices can also allow a feedhorn to accept both linear and circular, though these cause a slight Insertion Loss to all incoming signals. When used with a Parabolic Reflector or Lens Antenna , the Phase Center of the horn is usually placed at the Focal Point of the reflector, with the 3dB Point s of the horn's Radiation Pattern set to be at the edge of the reflector. On a satellite dish, the feedhorn is what is mounted at the end of a Mast from the center of the dish, or on Tripod legs mounted to the edge of the dish. If combined with the Low-noise Blockconverter (LNB), the feedhorn is part of an LNBF . SEE ALSO |
|
|