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4DTV is a proprietary broadcasting standard and technology for digital cable broadcasting and C-band/Ku-band satellite dishes from Motorola, using General Instrument's DigiCipher II for encryption. It can tune in both analog VideoCipher II and digital DCII satellite channels.
[citation needed] As of 2009, there are 23 C-band satellites and 38 K u /K a band satellites. [17] There were over 150 channels for people who want to receive subscription channels on a C-band dish via Motorola's 4DTV equipment via two vendors Satellite Receivers Ltd (SRL) and Skyvision Archived January 13, 2011, at the Wayback Machine. The ...
The satellite communications portion of the C band is highly associated with television receive-only satellite reception systems, commonly called "big dish" systems, since small receiving antennas are not optimal for C band. Typical antenna sizes on C-band-capable systems range from 6 to 12 feet (1.8 to 3.5 meters) on consumer satellite dishes ...
In November 1990, Primestar launched as the first North American direct-broadcast satellite service. Hughes's DirecTV, the first national high-powered upper K u-band satellite TV system, went online in 1994. The DirecTV system became the new delivery vehicle for USSB.
DigiCipher II uses QPSK and BPSK at the same time. The primary difference between DigiCipher 2 and DVB lies in how each standard handles SI metadata, or System Information, where DVB reserves packet identifiers from 16 to 31 for metadata, DigiCipher reserves only packet identifier 8187 for its master guide table which acts as a look-up table for all other metadata tables.
A typical satellite has up to 32 K u-band or 24 C-band transponders, or more for K u /C hybrid satellites. Typical transponders each have a bandwidth between 27 and 50 MHz. Each geostationary C-band satellite needs to be spaced 2° longitude from the next satellite to avoid interference; for K u the spacing can be 1°.
The now-defunct VOOM and PrimeStar services both used General Instruments/Motorola equipment, and thus used a DigiCipher 2-based system very similar to that of earlier 4DTV large dish satellite systems. [citation needed] In Canada, both Bell Satellite TV and Shaw Direct DBS systems use digital encryption standards. Bell TV, like Dish Network ...
The following is a list of pay television networks or channels broadcasting or receivable in the United States, organized by broadcast area and genre.. Some television providers use one or more channel slots for east/west feeds, high definition services, secondary audio programming and access to video on demand.