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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
KA Band section
The DirecTV SL3K4NR1-03
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<blockquote data-quote="Vipersan" data-source="post: 899523" data-attributes="member: 325666"><p>Ok ..</p><p>Perhaps my reasoning has totally left me ..</p><p>Or maybe I just had a Eureka moment..</p><p>Thinking about the SL3 logically ..</p><p>It's 3 lnbs in one ..and only the centre (Ku) can be in a direct line with focus ..boom arm ..dish ..and thus satellite ..</p><p>The Ka lnbs to the left and right would be lightly angled to the focus ...IF ..they were seperate lnbs in order to line up with the 2 sats to the left and right..</p><p>but they are not ...</p><p>So being an integrated unit ...perhaps the cut away ring acts to create a false focus ..ie ..a lensing effect to bend the signal slightly ....</p><p>..and your adding of the brass ring corrects this false focus ..thus straightening the beam again .. to accomodate the fact that the Ka port is now at the focus ..NOT the Ku port ..</p><p>Long thin individual lnbs can be angled ..whereas a flat 3 lnb combo ..not so much ...</p><p>This being their way around the problem.</p><p></p><p>Chances are the dish is also shaped to give a Horizontally spread response to multiple points on the arc..</p><p>A combination of shaped dish and shaped lnb giving the desired effect in the USA</p><p></p><p>what think you Llew..?</p></blockquote><p></p>
[QUOTE="Vipersan, post: 899523, member: 325666"] Ok .. Perhaps my reasoning has totally left me .. Or maybe I just had a Eureka moment.. Thinking about the SL3 logically .. It's 3 lnbs in one ..and only the centre (Ku) can be in a direct line with focus ..boom arm ..dish ..and thus satellite .. The Ka lnbs to the left and right would be lightly angled to the focus ...IF ..they were seperate lnbs in order to line up with the 2 sats to the left and right.. but they are not ... So being an integrated unit ...perhaps the cut away ring acts to create a false focus ..ie ..a lensing effect to bend the signal slightly .... ..and your adding of the brass ring corrects this false focus ..thus straightening the beam again .. to accomodate the fact that the Ka port is now at the focus ..NOT the Ku port .. Long thin individual lnbs can be angled ..whereas a flat 3 lnb combo ..not so much ... This being their way around the problem. Chances are the dish is also shaped to give a Horizontally spread response to multiple points on the arc.. A combination of shaped dish and shaped lnb giving the desired effect in the USA what think you Llew..? [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
KA Band section
The DirecTV SL3K4NR1-03
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