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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
July 2001
 


Q.1 : What is the use of the base band composite out of an analog satellite receiver, can it be used to receive digital signal from this output?

Ans: Base band is a raw and unfiltered video-signal. The BB output is usually connected to an external decoder, like D2/MAC or others. Analog receiver can not be converted into a digital receiver. Sorry, but you have to spend some money for the digital toy.




Q.2 : For the past several weeks I have had diagonal lines running across my screen, I have checked cable connections, tried adjusting feed horn distance from the dish, checked for obstructions, etc to no avail. I have a GI 550 with 1/2' mesh dish. Any suggestions ?

Ans: Are you using any equipment which transmits data near your antenna cable or sat receiver? Devices such as a NITEC-Rotor have up to 14 cables running between the control box and the rotor. Some of the cables carry control data. If all cabling is closed together on the backside of your receiver, diagonal thin stripes will run over the monitor screen. Other computer aided equipments could do the same. Just disconnect piece for piece and watch the picture. Also a nearby PC could be responsible. Good Luck !!




Q.3 : I have some technical questions for you have accumulated: 1) I have a prime focus mirror 1.2m, made from aluminum technology of hydro explosion. If its surface is to polish, whether quality of its work will be improved? 2) How correctly to calculate the sizes of feeds and wave guides for converters of C-band and Ku-band for prime focus aerial? Thanks!

Ans: Do not polish a dish, because if it gets too shiny, it will reflect the sunlight and the result will be a ball from plastic, which has been a part of the coaxial cable, all plastic parts of the feed or polarizers and some other material. The inner height of a wave guide is 1/2 lambda of the height frequency. The width is one lambda of the highest frequency. The lower cutoff frequency of the wave guide starts if the 1/2 lambda of this lower frequency is lower than the 1/2 lambda (height) of the highest frequency. A little bit difficult to explain. Lets calculate a standard WR75 feed for the Ku-band: The operating range is 10 to 15 GHz 1/2 lambda for the height is 0.953 cm the width is 1.906 cm the lower cutoff frequency is 7.87 GHz, because a 1/2 lambda is 1.905 cm and will rise if you go down in frequency. The standard value for C-band is: operating range: 3.3 to 4.9GHz inner height of the wave guide: 2.908 cm inner width of the wave guide: 5.816 cm cutoff frequency: 7.869 GHz.




Q.4 : I am trying to use 2 LNBs on fixed 12 ft. Dish to be able to receive from 2 satellites (Arabsat 3A, Hotbird), I know that these two satellites are close to each other. I can receive from Arabsat a very strong signal, but I'm trying to align the other LNB to Hotbird but unfortunately I can't find it, my question is that I am using a digital Humax receiver. Please give me the correct answer? Thank You !

Ans: These two satellites are not close enough to receive both of them with single antenna. Even if you carefully place one LNB in far offset, there will be not enough reflection power from the dish to get a signal strong enough. Why not place a second smaller fixed dish for HOTBIRD besides the large one.




Q.5 : Please kindly give me some details about SCART Thank You !

Ans: A fully assembled Scart socket contains the following connections: 1) Audio output B 2) Audio input B 3) Audio output A 4) Audio ground 5) Blue ground 6) Audio input A 7) Blue 8) Switching voltage 9) Green ground 10-11) Green 12-13) Red ground 14) Ground 15) red 16) Blanking Signal 17) Video out put ground 18) Video input ground 19) Video output 20) Video input 21) Screening or ground. If the Scart contains no RGB but S-VHS, then Pin 7, 11, 16, 19 are not in use and the following pins are used for S-VHS: 15 Chroma Signal S-VHS 20 Video input or luminance with S-VHS.




Q.6 : I can watch some programs very good with my digital satellite receiver. But some of the Channels in my viewing are very bad as well as the audio are totally not appreciable. Please let me know on how to solve this problem. Do I have to do the following steps: 1) Offset the received frequency, 2) Alter the video and Audio PID, 3) And or change the symbol rate and FEC?

Ans: If you mean to say about the TBNE Channel, then you should not see any thing with your digital receiver, because TBNE comes down Analog and this means that you need a suitable analog receiver or a combination of both.




Q.7 : What does the message error mean: Check Pulse?

Ans: One of your cables from the motor carries the pulses down to the positioners to determine the exact position. Check on the backside of your receiver/positioners if the pulse cable is properly connected. Also check the same connection on the motor. If connections and cable are in perfect order and the problem is still there, then you should open the motor and clean it very, very carefully the read-contact. If its mounted on a little triangle print-board and below you see a black wheel. There must be a small distance between the reed relay and the wheels. Sometimes there is most moisture or dust between the two parts.




Q.8 : About a year ago, I installed a number of MNET systems, Pas 4, C- Band without any problems, 2.4 m dish, 17k Cal amp LNB, receivers PACE (Irdeto conditional access card). Over the summer I started to get calls from the customers about loss of sound and picture every 2 to 3 minutes. On one specific customer I did the following: Changed the LNB twice, Changed the coaxial cable and connectors, re located the dish and finally changed the receiver. The problem still exists. On studying the situation further the customers only lose the pictures and sound on clear days and nights, if the weather is cloudy, picture and sound are stable without any interruptions. The dishes are also facing a hill where there are terrestrial antennas for the local channels and may be mobile telephone repeaters. If I am getting TI problem, do I need some sort of band pass filters. The systems as mentioned is C Band package M-Net. Kind regards !

Ans: I am afraid it could TI from the mobile telephone repeaters. First try band pass filters. JOHANSSON and GLOBAL Communication offer these filters for a low price. These filters are cutting down all signals below 900 MHz. From the same companies you can get the "Sat slopes", which "equalizes" the IF-Band We got the same day/night experience here and this little device cured the problem, because the age of our tuner could not cope with strong signals in the lower band.




Q.9 : Would you please advise me what's the difference between Ku and C- band? And what's the relation with the LNB?

Ans: The C-band covers the frequency range between 3.6 and 4.2 GHz. The Ku band runs from 10.7 to 12,75 GHz. For each of the band you need a suitable LNB and Feed. DTH-transmissions in Europe use the Ku band, but also the C-band is used by Arabic countries, Africa and Russia. Much more you will find the C-band in Asia and the America. But also here the Ku-Band becomes popular, because dishes are a lot smaller than C-band antennas.


 

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