|
|
| DTH Services » Glossary |
|
|
Glossary |
|
Elevation - The elevation is the upward tilt of a satellite dish antenna required to aim it at the communications satellite, measured in degrees. When aimed at the horizon, the elevation angle is zero.
Estimated Viewing Occupancy (EVO)The number of seats that can view television programming at any given time in a commercial establishment. Estimates for standing areas may also be added to this number. The EVO is determined by the establishment owner and subject to verification and revision by DIRECTV. The EVO is used to determine commercial rates for certain sports and standard programming.
Feature Menu - An interactive on-screen menu system that is part of the DIRECTV Receiver and allows the customer to control and review system features and functions. These include customization options, the program guide, system set-up, help, etc.
Feed Horn - A feed horn collects the signals at the focus of the satellite dish and channels them to the LNB.
Feedhorn Probe - The feedhorn probe is used to pick up either the vertically or horizontally polarized signals from the feedhorn cavity. It is used on feedhorns with a motorized polarity control. The motor is controlled by the receiver or by a polarity switch near the receiver.
Footprint - Where the signal transmitted from a satellite is able to reach with an acceptable signal.
Frequency - The property of an alternating-current signal measured in cycles per second or hertz
Geostationary - Geostationary refers to satellites which orbit the Earth 22,300 miles above the Equator and rotate at the same relative speed and direction as the Earth's surface, therefore appearing stationary.
Geosynchronous Orbit - A satellite orbit in which the satellite's speed is synchronized with Earth's rotation. Therefore satellites in such an orbit appear from Earth to be stationary. That is, they stay in the same place in the sky with respect to a position on Earth. Also sometimes called a "geostationary" orbit.
|
|
