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Trouble Shooter

Tracksat.com 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 : dishtech@tracksat.com
March 2002
 


Q.1 : I am a cable technician from Hyderabad. First of all many thanks for providing a most valuable magazine on satellite and cable. I want to know the CNTV frequency on the Agila2 satellite located at 142E. Are there any other channels on the satellite (analog or digital) and also any Ku band channels?

Ans: Thank you for interest in our magazine, the Agila 2 satellite is located at 146 degrees East (not 142). The frequency of the CNTV channel on the satellite is – 3834 MHz, with Horizontal polarization, Symbol Rate: 6429 and FEC 3/4. Yes, the Agila C band footprint covers most of Asia. However, the Ku band footprint does not cover Pakistan.




Q.2 : I have a Ku band LNBF. Is it possible to use an 8ft analog dish to receive Ku band signals?

Ans: Yes it is possible to receive Ku signals using an 8ft dish and a Ku band LNBF. However you must ensure that the footprint of the Ku transponder provides coverage in your area.




Q.3 : Dear Sir, from January 10th most of the channels on the ST-1 satellite at 88E are scrambled including Rainbow. If there is any other channels on this satellite, either horizontal or vertical polarization, please provide details?

Ans: Yes Mr. Ahmed most channels on ST 1 are now scrambled. The only available free as of today is the BBC channel, on a digital feed at 3632 MHz, with Vertical polarization, SR 26667 and FEC 3/4.




Q.4 : My analog receiver is unable to tune to Indus Vision and MRTV. Have they gone digital from analog? The Channel Guide says both of them are analog?

Ans: Regarding the channels Indus Vision and MRTV – Indus Vision is on Asiasat 3S being downlinked at 3900 V, as a digitally compressed channel with SR 27900 and FEC 7/8. It has been a digital channel for quite some time. The MRTV channel is on Thaicom 3 with a downlink frequency of 3666 H, SR 6000 and FEC 2/3. It is also available on the same satellite at 3676 H. Both these are digitally compressed channels & require the use of a digital satellite receiver, for their reception. The details in the Dish Channels Guide also indicate these as digitally compressed channels.




Q.5 : I would like to receive SURYA TV at Ratlam. Kindly advice me how to receive the channel, since the satellite used by them is not so popular with the cable operators in northern areas of Pakistan?

Ans: Surya TV is available from the NSS 703 satellite, located at 57 degrees East. It is part of the Sun TV package and is available as a digitally compressed, free-to-air channel. The details of the downlink frequency are: Freq./Pol: 3980 R, SR: 28000, FEC: 3/4, FTA, East Hem Beam.




Q.6 : I would like to know the possibilities of receiving Hotbird satellites in India (Tamil Nadu). Please let me know if there is a way to receive it?

Ans: The Hotbird is a Ku satellite and its footprint does not cover most of India. The footprint does cover some parts of North India mainly in Gujarat, Punjab & HP close the Indo-Pak border. Unfortunately for you, the footprint does not provide any signal over Tami Nadu.




Q.7 : The new look of your Dish Channels Magazine is too good. I have one query. The January Channels Guide indicated that DD-10 (Mumbai) on Insat2C is on a “wide” beam. Is it true? Earlier, your Channel Guide listed it as on a zonal beam. Does this mean that DD-10 can now be received in Kuwait?

Ans: Yes it is now on the wide beam. It should be receivable in Kuwait though you are on the fringe of the beam.




Q.8 : I am using a digital satellite receiver in the C-band. Is it possible to receive Ku band channels with a smaller Ku band dish antenna? Please give me the circuit diagram of an LGI-5200 FTA MODEL & pin connections of the chip Sti5500?

Ans: All digital receivers are able to receive both C-band as well as Ku-band frequencies. You can use the same dish, however the LNB & feedhorn are different. Regret that we are not in a position to supply circuit diagrams for satellite receivers of any particular make; these are available from the original manufacturer.




Q.9 : Dear Sir, I have a cable network in a town in Faisalabad. I have the Star package but the others do not have it. For a few days during prime time there was disturbance on the frequency of the Star package. I guess that it is done by some jamming device, which obstructs the Star frequency. I don’t know the solution. Please help. The other day STAR was obstructed from 10pm to 11pm and at 11.10 pm it was OK. There is no doubt it is sabotage but what precaution can we take?

Ans: In all fairness, I do not think it is any sabotage. It would be more reasonable to presume that some form of new, terrestrial microwave transmission has commenced, which is interfering with the Star TV signals. Microwave transmissions are usually from Microwave Links, Airport or Military Radar. Given the current tension between India & Pakistan, I would speculate that the Microwave transmissions are of Military origin. Is your Star TV Dish Antenna mounted on a Terrace / Roof Top? If so, shifting it to the ground level will reduce or eliminate the interference. If the Antenna is already at ground level, you will need to relocate the Dish Antenna so that a building comes in-between your Dish Antenna and the source of the Microwave Transmissions. If you are aware of a Military Base in your area, then you could assume this to be the direction from where the interference originates. Alternately, you will have to try different locations for the Dish by trial and error, probably moving it to another part of the building or as a worst case into another nearby compound. I understand that such re-locations are difficult in practice but it is a good technical solution.




Q.10 : I have an old receiver with available frequency from 950 – 1700 MHz. how does it receive C Band transmissions, which are at 4,000 MHz?

Ans: Yes, C Band transmissions are at 4 GHz and are received by the LNB at this frequency. The LNB down converts these transmissions to a range of Intermediate Frequencies (IF) that span from 950 MHz to 2150 MHz. It is these range of IF frequencies that are fed into the Receiver. Incidentally, both C band Ku Band receivers employ the same IF frequency range. Hence for Ku Band reception, the LNB actually down converts 10 GHz to 12 Ghz. frequencies to the standard IF frequency band. All C Band LNBs incorporate a Local Oscillator (LO), operating at 5150 MHz inside the LNB. The final output frequency of the LNB is the LNB. The final output frequency of the LNB is the difference between the Local Oscillator and the received frequency. Let us assume that you plan to receive a satellite broadcast at 4050 MHz. The resulting IF frequency will be 5150 – 4050 = 1100 MHz, which is then tuned by the satellite receiver.


 

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