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DISH SETUP: Single sat, Multi-Sat & Motorised
Webro WF100 - Length For Strength ?
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<blockquote data-quote="s-band" data-source="post: 1077972" data-attributes="member: 407744"><p>It depends on the LNB gain. As long as you can see a significant increase in noise, across the whole IF band, when you connect the cable, you probably won't be losing any SNR. Looking at the specs, 125 is only a couple of dB better than 100 for a 100m length at 2050MHz. It won't make any difference what band the LNB is on the same applies (you're only interested in the IF loss).</p><p></p><p>For really long runs I'd include a gain slope equaliser with a bit of gain. In my case, I put it where there's a divider in line, about 1/3 the way. The 1st bit is about 10m and the 2nd is about 25m. It' not ideal but it works.</p><p></p><p>If you got some attenuators, try putting the calculated loss in line with what ever you have at the moment and see what happens. I'm sure others will have rules of thumb for this.</p><p></p><p><edit> A further thought: When using a TBS69xx, you should see around -70 to -50dBm noise. If you see a straight line where the noise should be, you've lost too much.</p></blockquote><p></p>
[QUOTE="s-band, post: 1077972, member: 407744"] It depends on the LNB gain. As long as you can see a significant increase in noise, across the whole IF band, when you connect the cable, you probably won't be losing any SNR. Looking at the specs, 125 is only a couple of dB better than 100 for a 100m length at 2050MHz. It won't make any difference what band the LNB is on the same applies (you're only interested in the IF loss). For really long runs I'd include a gain slope equaliser with a bit of gain. In my case, I put it where there's a divider in line, about 1/3 the way. The 1st bit is about 10m and the 2nd is about 25m. It' not ideal but it works. If you got some attenuators, try putting the calculated loss in line with what ever you have at the moment and see what happens. I'm sure others will have rules of thumb for this. <edit> A further thought: When using a TBS69xx, you should see around -70 to -50dBm noise. If you see a straight line where the noise should be, you've lost too much. [/QUOTE]
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DISH SETUP: Single sat, Multi-Sat & Motorised
Webro WF100 - Length For Strength ?
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