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Trouble Shooter offers to its valued customers, this precious service. If you have any queries about any thing related to the Satellite World, you can send your queries to :
May 2002

Q.1 : We do not receive Jain TV. Please provide the new reception parameters.

Ans: Dear Mr. Suresh, Jain TV has become a Digital channel. It is now available from the same Thaicom 3 satellite 3538 V, DVB/clear, SR 3300, FEC 3/4.

Q.2 : I am living in Karachi. I am a regular reader of your Magazine. I have some problems receiving signals from the following satellites. Is it possible to receive them Karachi? 1) Express 6A 80° E 2) Gorizont 28 96.5° E 3) Yamal 4) Palapa C2 113° E 5) Jcsat 3 128° E 6) Apstar IA 134° E

Ans: You should be able to receive the C-Band signals from the Express 6A, Palapa C2 (Asia Beam only), in Karachi.

Q.3 : What about the channel “Myawaday” 3766V in AsiaSat2. Is it a free to air channel? Previously I used to receive this channel but now I do not receive it. Thank you for your cooperation.

Ans: Yes you are right, the Myawaday channel went off from Asiasat 2 two weeks back. It is now available only from the Palapa C2 satellite. There is another Burmese channel – Myanamar TV, which is available on Thaicom 3. Check out the frequencies and details on he Channel Guide in our Dish Channels Magazine.

Q.4 : What kind of Spectrum Analyser would you recommend for field strength meters?

Ans: A 860 MHz Spectrum Analyser costs over Rs. 1.5 lacs. For everyday use you need a Field Strength Meter, not spectrum analyzer. Various products, are available A small basic one, which will measure all channels in the forward path but without any memory, should cost you approx. Rs. 18,500.

Q.5 : For adjusting the dish antenna to receive a particular satellite, what kind of compass (and the manufacturer) do you recommend for measuring its degree?

Ans: You need a compass and inclinometer. Both available in the market.

Q.6 : If I use a WAM – 500 SL Agile Modulator (Winersat), can it give out upto 50 channels without the signals getting mixed up? Do you recommend this modulator? Thanks !

Ans: As you correctly indicate, you really need to consider the number of cascaded (in series) amplifiers on your longest trunk line. There are several reputed Pakistani modulator manufacturers. Check out the ads in our magazine.

Q.7 : I am an avid reader of your magazine and would be very much obliged if you could give your advice on the following: For about 1000-2000 customers, what kind of modulator do you recommend if I want to change the Head End Equipment? Please note that Model Colony, Karachi is a very hilly area with scattered houses, unlike the plain areas of Pakistan.

Ans: Dear Mr. Latif a mongst imported products, Winnersat Modulators are available in the Pakistani market for less than Rs. 4,500 each and provide excellent value for money. The WAM-500 SL frequency agile modulator from Winersat is an excellent product. However, I would recommend that you buy fixed channel modulators for most of your channels. You could keep 2 or 3 Frequency Agile Modulators as part of your line-up. A spare Frequency Agile Modulator would help you to temporarily replace any fixed modulator that fails. A Frequency Agile Modulator always generates more noise than its equivalent fixed frequency modulator. Also the Frequency Agile Modulator costs more. Hence, always use fixed frequency modulators, as far as possible with a few frequency agile, to provide you flexibility for replacement during service and also agile selection of a few channels.

Q.8 : Can I receive digital signals from 28 degrees K Gardiner (3.7-4.2 GHz) LNB? Please reply to my queries as soon as possible.

Ans: Yes, you should be able to receive both analog as well as digital signals with your C-band LNB.

Q.9 : What is the technical difference between a C band dish & a Ku band dish?

Ans: The principle of operation for both C & Ku band Dishes is the same. The Dish collects all signals received on its surface and focuses it on to the LNB Assembly. This is done irrespective of whether the signal is C or Ku Band. The wavelength of a 4GHz C band signal is appox. 25mm. For a Dish to effectively reflect and focus the signals onto the LNB Assembly, the shape of the Dish should perfectly match the design parabolic shape. As you can imagine, because of the shorter wave length of the Ku Band Signal, the tolerance of the Ku Band Dish is much tighter and more difficult to maintain than for the longer wave length C Band signals. The gain or the Amplification provided by the Dish actually depends on how much larger the Dish Antenna diameter is, compared to the wavelength of the signal. As a result a Ku Band Dish of I meter Diameter will provide a similar gain to a C Band Dish of 3 meter Diameter. Though transmission loss from the Satellite to the ground is much higher due to rain, attenuation in the Ku Band, Ku Band transmissions are usually more than 100 times (20 dB – power) stronger than typical C Band transmissions. As a result, typically, a 3 feet or 4 feet diameter Dish Antenna is more than adequate for reception of any Ku Band Signals. Incidentally, the same 3 to 4 diameters Dish will also be adequate for personal reception of C Band Signals. (Do note that for use at the Headend, a 12 feet diameter C Band Dish should be used, as recommended by the Bureau of Indian Standards). To better maintain the exact Dish Geometry (shape) Ku Band Dishes are usually made from a single piece pressed metal or fiber glass. It is for this reason that a number of Indian manufacturers now offer a 4 feet Diameter C+Ku Band Dish. You would of course need to mount the appropriate C or Ku Band LNB Assembly (LNB + Feedhorn) to receive the signals from the Dish.


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