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Satellite TV receivers & systems support forums
Fringe Reception General
Best receiver for aligning dish
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<blockquote data-quote="Huevos" data-source="post: 652372" data-attributes="member: 301161"><p>There is no such thing as minimum pixelization. Pixelization shows you are at the signal to noise threshold imposed by Shannon's theorem. If signal to noise gets worse there will be no picture at all. If it gets better the picture will be perfect, but you have no way of knowing how far above the threshold the signal to noise ratio is. With a professional meter you can see how far above the threshold you are even when there is a perfect picture and this allows you to get the alignment nailed. It also lets you predict how the dish will perform at different times of day as the satellite power goes up and down, and lets you predict if, for example, there is any rain fade margin.</p><p></p><p>That's not true. If he is receiving channels from 2A then he is receiving signal from 2D, it's just that those signals are below the signal to noise threshold imposed by Shannon's theorem. If you plug in a decent meter with spectrum display the signal from 2D would be clearly visible. For example one of my dishes is 90cm. From this location that is far to small for 2D reception but on the spectrum display the signal is clearly visible and the signature looks the same as for a larger dish. To the receiver though this signal is invisible/non-existent. What this means is you can get almost perfect alignment of a dish on to a satellite the receiver can't even see. And if you know you have perfect alignment but no lock the dish is obviously too small.</p></blockquote><p></p>
[QUOTE="Huevos, post: 652372, member: 301161"] There is no such thing as minimum pixelization. Pixelization shows you are at the signal to noise threshold imposed by Shannon's theorem. If signal to noise gets worse there will be no picture at all. If it gets better the picture will be perfect, but you have no way of knowing how far above the threshold the signal to noise ratio is. With a professional meter you can see how far above the threshold you are even when there is a perfect picture and this allows you to get the alignment nailed. It also lets you predict how the dish will perform at different times of day as the satellite power goes up and down, and lets you predict if, for example, there is any rain fade margin. That's not true. If he is receiving channels from 2A then he is receiving signal from 2D, it's just that those signals are below the signal to noise threshold imposed by Shannon's theorem. If you plug in a decent meter with spectrum display the signal from 2D would be clearly visible. For example one of my dishes is 90cm. From this location that is far to small for 2D reception but on the spectrum display the signal is clearly visible and the signature looks the same as for a larger dish. To the receiver though this signal is invisible/non-existent. What this means is you can get almost perfect alignment of a dish on to a satellite the receiver can't even see. And if you know you have perfect alignment but no lock the dish is obviously too small. [/QUOTE]
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Fringe Reception General
Best receiver for aligning dish
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