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DISH SETUP: Single sat, Multi-Sat & Motorised
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Long Cable RG-11 Issue
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<blockquote data-quote="archive10" data-source="post: 1010500"><p>It's only qualified guessing, but I would suggest that the actual cable-length is not the problem per se.</p><p>Any signal power loss can be compensated by a proper line amplifier as you describe.</p><p></p><p>But it's not the signal strength that is the key factor: Quality is really the most important thing.</p><p>With a C/N level of 10-12 dB you should be fine for most situations.</p><p>I speculate that your problem is interference, or irradiation somewhere along the signal path.</p><p></p><p>I have personal experience of 100+ meter cable run with marginal reception, whre IRD indicates 0% strength, but 90% signal quality.</p><p>And continous picture.</p><p>I believe this is down to professional grade cable and connectors being used (it's at head-end of cable-operator).</p><p>The key is to avoid any degradation or noise-induction along the signal path.</p><p></p><p>Without knowing the specifics of your installation, I can first suggest checking things like:</p><ul> <li data-xf-list-type="ul">Connectors: Are you using simple twist-on F-connectors, or RF-tight compression connectors throughout?</li> <li data-xf-list-type="ul">Cable proximity: does the coax cross power lines (even 220V) anywhere? Or (worse) run alongside at any length?</li> <li data-xf-list-type="ul"> Household equipment proximity: is any of the signal path passing close to washing machines or boilers that could induce power surges into the coax cable?</li> <li data-xf-list-type="ul">Neighbours: if you live in a "multiple dwelling unit" (ie. apartment buliding or the like), then your neighbours may have a bad microwave or wireless phone which can cause interference. This can be very difficult to diagnose.</li> </ul><p>In my home, I have the problem of swithing on the light in the hallway will disrupt SAT-signal to bedroom for a few seconds.</p><p>This is undoubtably down to a high spike in harmonics being radiated from the electrical switch into the coax (which is over half a metre away in the roof). Most practical work-around is to fit electronic power switch that "fades" the 230V in rather than mechanical bouncing switch. Moving the cable will be much more expensive.</p><p></p><p>But this is all speculation.</p><p></p><p>If you really want to know what happens, you need to get a data-logger that captures signal strength and quality over a 24h period.</p><p>Apart from pro-grade equipment, I think you can achieve the same using a "linux receiver" and a suitable image. I think these can be set up to do datalogging of the reception parameters, so that you can see what happens to the strength and (more importantly) quality.</p><p>This should give you a better idea of what causes to look for.</p><p></p><p>Re fibre optics: This will only work if the problem is irradiation along the coax. Irradiation in the IRD connectors will not be solved by this.</p><p>Also, you can have coax cables that are better insulated (but they are also more expensive, and often require special connetors etc.)</p></blockquote><p></p>
[QUOTE="archive10, post: 1010500"] It's only qualified guessing, but I would suggest that the actual cable-length is not the problem per se. Any signal power loss can be compensated by a proper line amplifier as you describe. But it's not the signal strength that is the key factor: Quality is really the most important thing. With a C/N level of 10-12 dB you should be fine for most situations. I speculate that your problem is interference, or irradiation somewhere along the signal path. I have personal experience of 100+ meter cable run with marginal reception, whre IRD indicates 0% strength, but 90% signal quality. And continous picture. I believe this is down to professional grade cable and connectors being used (it's at head-end of cable-operator). The key is to avoid any degradation or noise-induction along the signal path. Without knowing the specifics of your installation, I can first suggest checking things like: [LIST] [*]Connectors: Are you using simple twist-on F-connectors, or RF-tight compression connectors throughout? [*]Cable proximity: does the coax cross power lines (even 220V) anywhere? Or (worse) run alongside at any length? [*] Household equipment proximity: is any of the signal path passing close to washing machines or boilers that could induce power surges into the coax cable? [*]Neighbours: if you live in a "multiple dwelling unit" (ie. apartment buliding or the like), then your neighbours may have a bad microwave or wireless phone which can cause interference. This can be very difficult to diagnose. [/LIST] In my home, I have the problem of swithing on the light in the hallway will disrupt SAT-signal to bedroom for a few seconds. This is undoubtably down to a high spike in harmonics being radiated from the electrical switch into the coax (which is over half a metre away in the roof). Most practical work-around is to fit electronic power switch that "fades" the 230V in rather than mechanical bouncing switch. Moving the cable will be much more expensive. But this is all speculation. If you really want to know what happens, you need to get a data-logger that captures signal strength and quality over a 24h period. Apart from pro-grade equipment, I think you can achieve the same using a "linux receiver" and a suitable image. I think these can be set up to do datalogging of the reception parameters, so that you can see what happens to the strength and (more importantly) quality. This should give you a better idea of what causes to look for. Re fibre optics: This will only work if the problem is irradiation along the coax. Irradiation in the IRD connectors will not be solved by this. Also, you can have coax cables that are better insulated (but they are also more expensive, and often require special connetors etc.) [/QUOTE]
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DISH SETUP: Single sat, Multi-Sat & Motorised
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Long Cable RG-11 Issue
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