Installing a Satellite Dish Using Tv Explorer

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Installing a Satellite Dish Using Tv Explorer TV EXPLORER INSTALLING A SATELLITE DISH USING TV EXPLORER A bit of history That's it, a bit of history. First artificial where the satellite "transposes" the directional antennas and very high satellite "Sputnik I" was launched 4th of up-link frequency (6,390 GHz in Telstar) transmitters power, digital transponders, October of 1957 by former Soviet Union. to another down-link frequency meaning in plain words that we can recei- It was about the size of a basketball with (4,170 GHz in this case). Telstar I trans- ve hundreds of TV channels with a small, a weight below 100 Kgrs but went down mitter power was 3 Watts and the fix, cheap, 60 cm dish. in history as the start point for the space antenna was omnidirectional. age. For three weeks it was transmitting radio signals to the excited scientist on the ground that were gathering fundamental data for the launches to come. Modern broadcast satellites use geostationary orbits. This simply means that they could be seen from the ground hunging in the sky at the same exact position all the time and therefore The antenna used to receive the test receiving signals from them does not transmission from Telstar I was a huge require complex steering systems. horn inside a bubble radome 48 metres A piece of cake. high. All we need to do to receive their The first telecommunications satellite Only four decades later we have signals with the enormous amount of was Telstar I launched in 1962. Some broken all records and we have high programs they carry is to set up the people refers to Echo I as the World's first power DBS geostationary satellites satellite receiving antenna properly and in 1960 but it was a passive signal carrying a lot of digital transponders on to ensure that the signals are received reflector as opposite to Telstar that board and we start to worry about space with the proper quality levels…and here carried electronics on board like today's junk having thousands of satellites is where the TV Explorer comes into satellites. It was also the first to use in orbit, plenty of them beyond its useful action. the modern transponder concept life. Satellites use highly efficient TV EXPLORER The basics A professional installer will instantly tell us from the top of his Signals broadcast from the satellites use two polarisations head what to have in the to-do-list if we want to install a simultaneously. These can be LINEAR VERTICAL / HORIZON- satellite dish properly. Surely the list will require us to select the TAL or CIRCULAR LEFT / RIGHT depending on the type of proper mount kit and dish size from the numerous options transmitting antenna used in the satellite. The transponder available in the market, pick a good location for the dish, free frequencies for each polarisation are carefully selected to avoid of obstacles to the south (in the north hemisphere) or to interference to the other polarisation commonly referred to as the north (in the south hemisphere), etc. the crossed polarisation. In general they are imbricate or in other words frequencies used in one polarisation are free in the crossed polarisation and viceversa. Other than the mechanical bits and pieces the dish is 13 VDC VERTICAL CIRCULAR RIGHT made of two clearly differentiated parts, the 18 VDC HORIZONTAL CIRCULAR LEFT reflector and the LNB. Modern universal LNB's use mostly linear polarisation and The reflector is passive have also the capability to select a different input frequency and simply reflects signals range depending on a control signal called 22 kHz switching from the satellite in such a tone which is overlapped with the supply voltage. way that the beam is collimated to the LNB's SUPPLY VOLTAGE POLARISATION BAND mounting point. 13 VDC VERTICAL LOW 18 VDC HORIZONTAL LOW 13 VDC + 22 kHz VERTICAL HIGH The LNB (Low Noise Block-converter) is an 18 VDC + 22 kHz HORIZONTAL HIGH active device fruit of the great evolution of RF circuit manufacturing and includes In other words our LNB will output a different set of satellite amplifiers, oscillators and transponders depending on which supply voltage we use. frequency converters in a small low cost package. The first section is made of a device called polarisation shifter that receives one polarisation or the other depending on the supply voltage given to the LNB. This voltage is necessary to supply the active devices inside the LNB. An example of LNB (Low Noise Block-converter) TV EXPLORER Coarse dish alignment We can use different techniques to that orbit, something like a street number, For example ASTRA 19E refers to find out where in the sky the satellite that we can know from various sources. ASTRA satellite which is positioned at we want is located. They can be Orbital position is an important datum 19 degrees East in the orbit. anything from a pure guessing game to so it is commonly part of the name a sophisticated procedure. as well. Knowing where we are in terms of latitude and longitude is also easy. The satellites we are interested in Websites like www.lyngsat.com or We can read that information from a are all positioned in a geostationary www.satcodx.com offer plenty of map or even from our car's navigation orbit above the earth's equator. Each useful information about the satellites system if we have one. of them has a fix given position in we are talking about. AMC-23 NSS-5 AsiaSat4 AAP-1 AMC-8 AMC-7 AsiaSAT3S AMC-10 AsiaSat2 AMC-11 AMC-16 AMC-15 NSS-6 AMC-1 AMC-4 AMC-3 AMC-2 AMC-9 AMC-5 AMC-6 BrasilSat B1 BrasilSat B4 BrasilSat B2 BrasilSat B3 NSS-806 AMC-12 / ASTRA 4A 2A 2B 2C 1D 2D NSS-703 1KR 1H 1G 3A 1F 1E 1C NSS-7 ASTRA 2 Sirius2 Sirius3 ASTRA 3 ASTRA 1 With this information in hand we can For example if we take ASTRA 19E and Elevation must be measured from calculate the elevation and azimuth select a location somewhere in Germany: the horizontal level (may be using an we should put on the dish to begin our inclinometer) and azimuth from magnetic coarse antenna alignment. There are • Latitude: 50 degrees North north (with a compass). It is normally formulas to do that but some websites • Longitude: 12 degrees East more practical to start with azimuth are again quite useful. This one is moving the dish horizontally and then especially interesting for you can select The required elevation and azimuth look for the elevation. the satellite you want and then position for the dish are: yourself on a graphical map. • Azimuth: 170 degrees http://www.lyngsat.com/tracker/ • Elevation: 31 degrees TV EXPLORER Knowing what satellite we are on And the TV Explorer comes into action. Swing the dish slightly horizontally and Tune any of those digital channels in Our dish is now more ore less "looking" in vertically until a decent signal is shown frequency mode using the rotary knob the direction where we presume our on the screen. and the markers shown on the screen "bird" is parked. With the TV Explorer and press the AUTO ID key. The connected to the output of the LNB we There we have a satellite but which one TV Explorer will tell you what satellite select satellite frequency range ( ), is it? Most probably the signals we are and/or orbital position you are on in a antenna alignment mode ( ), span looking at are digital transponders from matter of seconds! of 200 MHz and set the power supply the unknown satellite. The TV Explorer voltage to one of the possible values ( ). can be operated in frequency or channel If we are unlucky and this is not the We will take for example 13 VDC, which modes. satellite we want then we only need to will take us to the VERTICAL polarisation move the dish slightly to pick the signal and LOW band. We can use 80 dBµV for from the next satellite and repeat the pro- the reference level for we can change cess. that at pleasure depending on the amount of signal we get. Something will come up on the TV Explorer screen. It will normally be a weak signal that may come from the desired satellite or from the neighbour ones for the dish is not properly tuned up yet. Fine tuning the dish Once we know for certain that we are on ASTRA 19E it is time As you move the dish's position you will see the signal to make fine adjustments to the dish to optimise the alignment. change on the spectrum analyser like it is shown in the picture. There are two goals to achieve. On the one hand we want to receive the maximum amount of power possible and on the Cross-polarisation is adjusted by rotating the LNB on its axis. other hand we need to make sure we minimise the interference As you do so you will see on the TV Explorer screen how the from the crossed polarisation. channels interfering from the opposite polarisation go up and down the objective being to leave the LNB in such a position In order to maximise the received signal power we need only that those channels are as low as possible. to move the dish's azimuth and elevation very carefully ensuring that the display of the spectrum analyser show us the highest values possible. Cross-polarisation is adjusted by rotating the LNB Moving satellite dish’s elevation TV EXPLORER Testing signal quality Look what we’ve got The TV Explorer is the ideal instrument for quick and The TV Explorer can also display the free to air programs effective checks of signal quality not only because it shows all available in the satellite.
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