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The 20 cm refractor is used occasionally for cometary and occultation observations and sometimes made available to visitors for night sky viewing. Twin spectroheliographs giving 6 cm diameter full disc photographs of the sun in K-alpha and H-alpha spectral lines are in regular use.
A card is included with installation or can be purchased direct from Sky. For security reasons [3] the viewing cards are deactivated from time to time and reception of the encrypted free-to-view channels disabled. This requires the user to purchase a new viewing card at the current standard charge.
Conditional Access Module Various types of CAM. A conditional access module (CAM) is an electronic device, usually incorporating a slot for a smart card, which equips an integrated digital television or set-top box with the appropriate hardware facility to view conditional access content that has been encrypted using a conditional access system. [1]
VideoGuard (sometimes referred to simply as NDS), produced by NDS, is a digital encryption system for use with conditional access television broadcasting. It is used on digital satellite television systems – some of which are operated by News Corporation, which owned about half (49%) of NDS until its sale to Cisco in 2012 (becoming Cisco Videoscape division). [1]
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Tata Play is the largest DTH service provider in India. [2] As of March 2023, according to TRAI Tata Play serves 21.3 million subscribers which is 32.65% of total DTH users in India. [2] Tata Play entered into an agreement with French firm Vantiva to supply 4K set top boxes from early 2015. [3] The company was formerly known as Tata Sky. [4]
The remaining channel aimed exclusively at the UK that use the Astra satellites at 28.2°E with a Europe-wide beam and remain free-to-view and encrypted is regions STV HD (Aberdeen, Dundee, Edinburgh), London Live and they can be viewed with a Sky Videoguard receiver and a Sky viewing card, either an inactive former Sky pay-TV card or one for ...
The series of cutpoints is determined by a pseudo-random sequence. Channels were decoded using a pseudorandom number generator (PRNG) sequence stored on a smart card (aka Viewing Card). To decode a channel the decoder would read the smart card to check if the card is authorised for the specific channel. If not, a message would appear on screen.