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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
C-Band Reception, UK and Europe
Which C-BAND lnb, 5g ?
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<blockquote data-quote="ArloG" data-source="post: 1162069" data-attributes="member: 418555"><p>Thoughts on 5G that have been discussed elsewhere.</p><p>If 5G is highly invasive. Such as would be the case if the dish in inline with cell towers.</p><p>An LNBF with built in filters perform better. As the interference is notched internally prior to mixing and IF conversion.</p><p>The Titanium Satellite LNBF's are built just for that.</p><p>Side lobe interference is an issue. Before 5G, satellites being weak in signal would not give side lobe issues.</p><p>But provide a strong enough interference (5G). Line of sight towers and a dish aimed off axis of them still presents interference.</p><p></p><p><em>I would like to see spectrum analyzer graphs that demonstrate this. Starting with the dish aimed in line with a tower. And the dish then swept across it's arc. Hopefully showing a decrease in 5G strength until the dish side lobe again showed an increase in the specific freq. range. Geeks? Bring it on!</em></p><p></p><p>External, 'hang on' 5G filters do work. With the expected insertion loss and decreased overall signal.</p><p>But a good idea if you have a dual output 3.4-4.2 GHz LNBF. You could hang a filter on one output and use a diseqc or 22 kHz switch to select your desired output signal. Or if you have a dual tuner receiver.</p><p></p><p>Metal cages around dishes are an extreme solution. And they work. Common on microwave dishes on towers are extended dish-rim metal rings that solve side interference. For a C band install they certainly would work. Combined with careful scalar adjustments. I'm not so sure about offset fed setups. For a prime focus dish there will be a marginal improvement in off axis interference reduction.</p><p>I guess you could fashion up a 12' cantenna if you so desired..</p></blockquote><p></p>
[QUOTE="ArloG, post: 1162069, member: 418555"] Thoughts on 5G that have been discussed elsewhere. If 5G is highly invasive. Such as would be the case if the dish in inline with cell towers. An LNBF with built in filters perform better. As the interference is notched internally prior to mixing and IF conversion. The Titanium Satellite LNBF's are built just for that. Side lobe interference is an issue. Before 5G, satellites being weak in signal would not give side lobe issues. But provide a strong enough interference (5G). Line of sight towers and a dish aimed off axis of them still presents interference. [I]I would like to see spectrum analyzer graphs that demonstrate this. Starting with the dish aimed in line with a tower. And the dish then swept across it's arc. Hopefully showing a decrease in 5G strength until the dish side lobe again showed an increase in the specific freq. range. Geeks? Bring it on![/I] External, 'hang on' 5G filters do work. With the expected insertion loss and decreased overall signal. But a good idea if you have a dual output 3.4-4.2 GHz LNBF. You could hang a filter on one output and use a diseqc or 22 kHz switch to select your desired output signal. Or if you have a dual tuner receiver. Metal cages around dishes are an extreme solution. And they work. Common on microwave dishes on towers are extended dish-rim metal rings that solve side interference. For a C band install they certainly would work. Combined with careful scalar adjustments. I'm not so sure about offset fed setups. For a prime focus dish there will be a marginal improvement in off axis interference reduction. I guess you could fashion up a 12' cantenna if you so desired.. [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
C-Band Reception, UK and Europe
Which C-BAND lnb, 5g ?
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