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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
June 2001
 


Q.1 : My Pace DSR 610 does not respond to any command from the remote-control or direct on the front panel. Its completely on tild and just a very boring pink screen. Can I reset the machine before throwing it out of the window?

Ans: Don’t kill this poor, slightly antique 610 just yet. First, unplug the box from the wall. Press and hold the stand-by button on the front-panel and then plug the box back in while pressing the stand-by button. “dL” should appear on the display. Release the stand-by button and now and press the +, - and stand-by buttons one after the other. The 610 is now reset and should go in to search-mode.




Q.2 : As you must be aware, in case of digital satellite signals, we receive two or more audio PIDs. Like in B4U Music the two audio PIDs are Audio1 PID (0974 in hexadecimal) and Audio2 PID (0976). What I know is the one we use for the B4U Music Channel is the Audio 1 PID. What is the Audio 2 PID is meant for?

Ans: Many a time, the satellite transponder in compressed mode will downlink more than one audio signal. This facility has many applications. For example, a stereo signal consisting of left and right channels requires 2 separate audio signals. Music channels that what to use 2 discreet audio carriers, one each for the left and right audio channels, use this facility. Sometimes additional audio channels such as radio channels are included, all of the other downlink parameters remain same except for the pid. This as been used very effectively on the European Bouquet from the Asiasat 2 satellite with a downlink of 4000 MHz. At this frequency, you will also simultaneously receive at least 15 audio-only channels containing programs in various Indian and foreign languages.




Q.3 : I have a no-name digital receiver (type no. DT301). I moved 2 weeks ago to my new home in this city. The satellite-set I took with me. Only the cables are new. Before I had a clean reception, but now all I got are frozen or destroyed images. An inline Sat slope did not help at all. The local airport is about 2 km far away, but this interference is too regular and steady to be originated by the airport-electronics. Any idea what could be the problem?

Ans: I imagine that you are asking for terrestrial TV connected to the local cable company. Channel 21 is used for TV in your city. This means a frequency is in use with a very strong signal near to the IF of your satellite receiver. Our testings here delivered the same ugly results. You should run the cable direct to the TV set and not as loop through, just buy a high-pass filter. The area around the IF (470 Hz) is surpressed by this filter with about 20 to 25 dB.




Q.4 : Dear Editor from time to time the built in Videocrypt decoder of my Amstrad SRD400 goes mad and spews out idiotic messages like = 93 Please insert is invalid=94= even though a valid card is in the slot. Whenever I take the thing to my dealer it=92s always working fine and continues to do so for a few days or weeks before the problems start again. What=92s wrong?

Ans: Just pull the plug for a minute or two. The problem is caused by spurious voltage peaks or mains interruptions generally created by, for example, thunderstorms or an unstable electricity supply. The logic circuit get confused and the result is the rubbish you see on the screen. This phenomenon is not a typical Amstrad fault but one possible in all Videocrypt decoders.




Q.5 : Dear Doc, living in a building with no dishes allowed, I have to use a hidden antenna with the diameter of 45cm. Generally reception is fine except during bad weather but certain channels are distorted or a black screen is all I get. The installed sat slope did not help very much. Having a closer look at the channel data from Dish channels, I discovered that the problem occurs only with channels using a FEC of 5/6 and sometimes the common 3/4. How can I solve this problem?

Ans: I am afraid the only solution is a large dish. If you receive signals with a FEC of 1/2 without problems, then a FEC of 2/3 would acquire a larger dish with the factor 1.3.3/4 means 1.4x the original size and the FEC of 5/6 is critical then here we would need a antenna 1.5 times larger then the original one.




Q.6 : I am a new comer in this so called Satellite World. At present, I am having an analogue receiver with 240CM mesh dish. My Dish is aimed at NSS 703 at 57 east. I am receiving all the analogue channels from this satellite without any troubles. Now I am planning to buy a Digital receiver to watch digital FTA channel (SUN NEWS) from same satellite (NSS 703). I have some Info about this channel: Channel Name: SUN NEWS, Freq (GHz): 3980, R, TP24, Mode: MPEG-2, SR: 28000, FEC: 3/4, V-PID: 1260, APID: 1220, Contributor: 000420. Now my questions are: 1.Apart from Digital receiver, what did I need to see that FTA Digital channel? 2. Can I use my existing Dish & LNB for digital channels? 3. I am living in Eastern part of Saudi Arabia, what is the appropriate size of the Dish and dish type?

Ans: The existing antenna should be good enough for digital signals in eastern Saudi Arabia. Even the SUN package is transmitted over the East Hemi beam. The digital FTA receiver should be C-Band compatible and in addition to MCPC, should also be able to handle SCPC signals. Test report of Media Com VACI gold receiver can be found in our issue. The existing C-Band LNB can at first be used. Tests have shown that even older LNB’s are just as capable of handling digital signals despite fluctuating LOF’s. Otherwise, a substantially more stable LNB would have to be purchased.




Q.7 : Presently, I am working in BURAIDAH, Kingdom of Saudia. As per your dish track program elevation, it is intended only for prime focus dish. How about sing offset dish? How much difference in the degrees between prime focus feed dish & offset dish? What is the formula in finding the said elevation? Is it depends on your location? One of my friends told me it is 22 degrees difference. When I checked from actual installation using offset dish beamed at 13 deg. East with elevation at 44 deg. With respect my location in BURAIDAH in KSA. I found it was 22 deg. Elevation and it was right. So, can you give me the answer?

Ans: Quite a lot of offset dishes are working indeed with a difference of around 22 deg., but not all, since the offset angle could be different. Usually there are markings on the mount that you can use to measure the true elevation. There are also formulas that can be used to calculate the elevation angle.




Q.8 : As I am planning to buy an IRD, I want your advise that which unit will work good in the Middle East, is it the Panasat 520, 524,530 or Nokia d-box or the Echostar?

Ans: Depends for which packages you want to use the IRD. Panasat 529 is fine, but a converted Nokia mediamaster would much nicer. On the other side you can except also valuable upgrades for the Panasat and the Vortec (or Samsung/Galaxy) made for the Italian market. In your situation I would wait a little bit until we got all this boxes tested if you like to receive the ORBIT package, you have to buy a Scientific Atlanta 9232 which is not DVB compatible. At least not for 100%. This until can be converted with a little trick to work on DVB-signals.




Q.9 : I am considering buying a DDS system with two receivers but I have been told that I cannot run two receivers off of the same dish unless I have a dish with dual LNBs. Is this true? If so, why?

Ans: In order to run both receivers with their own polarization control, you will need a dual LNB. If you use one receiver as master (controlling the polarization) and the other as slave, only a splitter (with one power pass) could be fitted.




Q.10 : I’m trying to use 2 LNBs on fixed 180c Dish to be able to receive from 2 Satellites (Arabsat 3A, Hotbird), I know these two Satellites are close together, I can receiver 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: Do you have a diagram or any method to calculate the exact location of the Hotbird depending on the position of Arabsat? I’m using a digital Humax receiver.

Ans: These two satellites are not close enough (13 deg.), to receive both of them with one antenna. Even if you carefully place one LNB in the 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 beside the large one?


 

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