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June 2008

Q.1 : Q: Do I really need a satellite receiver for every television in the house

Ans: Only if you want to watch different channels on the different televisions. For each television that you want independent control over, you will need a satellite receiver. This is also the case with digital cable

Q.2 : Is cable/satellite worth the money you pay for it? (Khaled Ahmed, Islamabad

Ans: I think cable and satellite are too expensive for the value they give, but all companies sell for pretty much the same. Some places there are only one choice available to you.

Q.3 : Are satellite digital recorders compatible with digital cable programming

Ans: No, sorry. There's not even a glimmer of hope that it will work. The reasons are many ( 1) completely different frequencies for the tuners (cable is 54MHz-~450MHz, satellite starts at about 802MHz after it has been block converted by the LNB) (2) Completely different modulation mode (cable is QAM, satellite is DPSK) (3) Different authentication and decryption schemes. There may be other things I'm forgetting too.

Q.4 : Satellites provide us countless satellite channels. How a Geo-Stationery Satellite work? (Arshad Mahmood, London)

Ans: There are usually many components to satellites. They cost millions of dollars and up. I think what you are asking is the concept. How do they stay "suspended" in that one spot in the sky? Well, it has to do with balancing gravitational pull and centrifugal forces I believe.

Q.5 : I want to see the same programmes and channels I have at home on my DirecTV system when I go on vacation. If I have a dish on my vacation home in Brazil, can I bring my receiver with me and hook it up there to get the same programming as I have at home

Ans: No, because the satellites that broadcast DirecTV’s signals only point towards the USA. It bleeds a little into border areas of Canada and Mexico, but no way would it reach South America. However, you can get a thing called a "sling box" where you can watch your TV at home over the internet.

Q.6 : What restrictions prevent a subscriber from receiving an acceptable quality signal

Ans: A requirement that an antenna be placed in a position where reception would be impossible or would be substantially degraded would conflict with the rule. However, a regulation requiring that antennas be placed to the extent feasible in locations that are not visible from the street would be permitted, if this placement would still permit reception of an acceptable quality signal.

Q.7 : What is diplexer? Are the receivers, which tests reports are published in Dish Channels are available in Pakistan

Ans: A diplexer combines the cable from a TV antenna with the satellite signal. It looks like a two way splitter, with one output cable connector on one side and two input cables on the other side. Connect the output(s) of the Twin LNB or the outputs from the SW-21, SW-44 or SW-64 switches and the local antenna to a diplexer outside, near the dish. The cable from the LNB or switch goes to the 950 - 2150 MHz side of the diplexer outside and the antenna cable to the other side. Bring the one cable into the house, near the main receiver. Add the second diplexer there and connect the 950 - 2150 MHz side of the second diplexer to satellite receiver (Satellite IN) and the other side to a two way splitter. For multiple satellite receivers, you can use a splitter from the TV antenna to supply the signal to more diplexers. Diplexers can not be used to split the signal from the LNB to add more receivers.

Q.8 : What are the reasons behind satellite-based positioning system receiver for weak signal operation

Ans: Satellite based positioning systems operate by utilizing constellations of satellites which transmit to earth continuous direct sequence spread spectrum signals. Receivers within receiving range of these satellites intercept these signals which carry data (navigation messages) modulated onto a spread spectrum carrier. This data provides the precise time of transmission at certain instants in the signal along with orbital parameters (e.g., precise ephemeris data and less precise almanac data in the case of GPS) for the satellites themselves. By estimating the time of flight of the signal from each of four satellites to the receiver and computing the position of the satellites at the times of transmission corresponding to the estimated times of flight it is possible to determine the precise location of the receiver's antenna.


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