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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
Help with Signal
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<blockquote data-quote="spiney" data-source="post: 162340" data-attributes="member: 192438"><p>if you can get the line amp as close as possible to the lnb, that will improve the signal to noise ratio, maybe just slightly, but that's critical since digital reception is "all or nothing".</p><p></p><p>when an amp has a "noise figure", that's just a ratio, then it shouldn't matter where you put the amp! But, in fact, that's false, since the noise is internally generated and comes out at a fixed level, no matter what the signal input level (strictly, saying "noise figure" isn't correct). So, if you put amp nearer to lnb - where signal level is higher - then with fixed noise output, you'll get a higher sig to noise ratio, and a better chance of getting more channels.</p><p></p><p>Another thing is, where cable enters lnb, the dc volts causes electolytic action at connector, degrading the signal, especially if not weather protected at all, or if wrong sort of plastic tape was used. If you've noticed slow wosening over months, that's probably the reason, in which case disconnect plug from lnb, and re-fit onto cable end, also clean around lnb socket if there's any "crud" there.</p></blockquote><p></p>
[QUOTE="spiney, post: 162340, member: 192438"] if you can get the line amp as close as possible to the lnb, that will improve the signal to noise ratio, maybe just slightly, but that's critical since digital reception is "all or nothing". when an amp has a "noise figure", that's just a ratio, then it shouldn't matter where you put the amp! But, in fact, that's false, since the noise is internally generated and comes out at a fixed level, no matter what the signal input level (strictly, saying "noise figure" isn't correct). So, if you put amp nearer to lnb - where signal level is higher - then with fixed noise output, you'll get a higher sig to noise ratio, and a better chance of getting more channels. Another thing is, where cable enters lnb, the dc volts causes electolytic action at connector, degrading the signal, especially if not weather protected at all, or if wrong sort of plastic tape was used. If you've noticed slow wosening over months, that's probably the reason, in which case disconnect plug from lnb, and re-fit onto cable end, also clean around lnb socket if there's any "crud" there. [/QUOTE]
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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
Help with Signal
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