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The Digibox is a device marketed by Sky UK in the UK and Ireland to enable home users to receive digital satellite television broadcasts (satellite receiver) from the Astra satellites at 28.2° east. An Internet service was also available through the device, similar in some ways to the American MSN TV , before being discontinued in 2015.
Channel is broadcast in 1080i (Sky+HD, Freesat, Sky Q) or 1080p (Sky Q) HD. Channel 4 Channel is broadcast in 16:9 SD unless stated. Channel 4 +1 Channel is a 1-hour time shift of the main channel and is broadcast in 16:9 SD. Regions CI Channel Islands Eng England (including Channel Islands and Isle of Man unless stated) NI Northern Ireland Scot
A skip zone is an annular region between the farthest points at which the ground wave can be received and the nearest point at which the refracted sky waves can be received. Within this region, no signal can be received because, due to the conditions of the local ionosphere, the relevant sky waves are not reflected but penetrate the ionosphere.
The advantage of this orbit is that the satellite's orbital period equals the rotation rate of the Earth, so the satellite appears at a fixed position in the sky. Thus the satellite dish antenna which receives the signal can be aimed permanently at the location of the satellite and does not have to track a moving satellite.
A broadcast signal intrusion is the hijacking of broadcast signals of radio, television stations, cable television broadcast feeds or satellite signals without permission or licence. Hijacking incidents have involved local TV and radio stations as well as cable and national networks.
A MEO satellite's longer duration of visibility and wider footprint means fewer satellites are needed in a MEO network than a LEO network. One disadvantage is that a MEO satellite's distance gives it a longer time delay and weaker signal than a LEO satellite, although these limitations are not as severe as those of a GEO satellite.
In 2002, the satellite's main spacecraft control processor failed, prompting DirecTV to move the spacecraft into a storage orbit. [27] The satellite was recalled in October 2003 and leased to Telesat, relocating to 82° W in order to provide backup for Nimiq 2. [28] In 2004, the satellite was relocated to 91° W, backing up Nimiq 1.
For long delay multipath, the receiver itself can recognize the wayward signal and discard it. To address shorter delay multipath from the signal reflecting off the ground, specialized antennas (e.g., a choke ring antenna) may be used to reduce the signal power as received by the antenna. Short delay reflections are harder to filter out because ...