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DISH SETUP: Single sat, Multi-Sat & Motorised
KA Band section
..and so it begins ..
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<blockquote data-quote="Vipersan" data-source="post: 853622" data-attributes="member: 325666"><p>Ok ...bear with me on this ..as I try to get to grips with this beastie.</p><p>Ignore lower ka band ..this is activated by switching on a band shifter ..not in line as yet ..</p><p>Ignore ku which is circular and would confuse the issue anyway..</p><p>I've popped a strip of aluminium tape over the centre hole which I believe to ku circular ku</p><p>So we are using the left and right holes ..both of which are ka low or ka high capable ..but in the absence of an IF convertor we shall only be using Ka high.</p><p>So ..Neil is positioned so that one of the 2 holes (ka lnbs) is focused at 9East ..thus the second ka lnb is offset by a couple of degrees.</p><p>as you'd expect ...any signal entering one of the lnb holes will be high ..and the second hole will still get the signal ..but reduced.</p><p></p><p>With me so far ?</p><p>Ok ..set off EBS to scan the whole range using UK standards ..ie band switched mid point using a 22khz tone.</p><p>But unlike UK lnbs this has the effect of switching KA lnbs so one hole then t'other..</p><p>As expected the peaks repeat ..but much reduced on one half of the scan ..the hole not pointing at 9 East.</p><p>Still with me ??</p><p>Now repeat the scan but this time 13v/18v switched ..normally H or V ..but in this case L or R ...(actually reverse this as the US use exactly opposite to Europe V = L ...H = R.</p><p>Ok ...attached is an EBS scan ..but only one of the peaks produced a carrier I could lock to - 16PSK SR 4000 ..</p><p>I believe this is an AOL carrier ..and is pointed to with green lines ..and the same peak appears twice ...as expected as the lnbs are swapped during the scan.</p><p>Notice however the red trace V ..or LHCP ..actually has a peak that doesn't appear in H or RHCP ..</p><p>I believe this to be Saorsat or at least where it _would_ be (I've always got a carrier at Saorsats location - an unmodulated blocking carrier I called it)..too weak to lock here but the fact that this is obviously circular polarised leads to be believe it's so.</p><p>Lesson over for now ..</p><p>My brain is hurting big time.</p><p>..but ..it's a start.</p></blockquote><p></p>
[QUOTE="Vipersan, post: 853622, member: 325666"] Ok ...bear with me on this ..as I try to get to grips with this beastie. Ignore lower ka band ..this is activated by switching on a band shifter ..not in line as yet .. Ignore ku which is circular and would confuse the issue anyway.. I've popped a strip of aluminium tape over the centre hole which I believe to ku circular ku So we are using the left and right holes ..both of which are ka low or ka high capable ..but in the absence of an IF convertor we shall only be using Ka high. So ..Neil is positioned so that one of the 2 holes (ka lnbs) is focused at 9East ..thus the second ka lnb is offset by a couple of degrees. as you'd expect ...any signal entering one of the lnb holes will be high ..and the second hole will still get the signal ..but reduced. With me so far ? Ok ..set off EBS to scan the whole range using UK standards ..ie band switched mid point using a 22khz tone. But unlike UK lnbs this has the effect of switching KA lnbs so one hole then t'other.. As expected the peaks repeat ..but much reduced on one half of the scan ..the hole not pointing at 9 East. Still with me ?? Now repeat the scan but this time 13v/18v switched ..normally H or V ..but in this case L or R ...(actually reverse this as the US use exactly opposite to Europe V = L ...H = R. Ok ...attached is an EBS scan ..but only one of the peaks produced a carrier I could lock to - 16PSK SR 4000 .. I believe this is an AOL carrier ..and is pointed to with green lines ..and the same peak appears twice ...as expected as the lnbs are swapped during the scan. Notice however the red trace V ..or LHCP ..actually has a peak that doesn't appear in H or RHCP .. I believe this to be Saorsat or at least where it _would_ be (I've always got a carrier at Saorsats location - an unmodulated blocking carrier I called it)..too weak to lock here but the fact that this is obviously circular polarised leads to be believe it's so. Lesson over for now .. My brain is hurting big time. ..but ..it's a start. [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
KA Band section
..and so it begins ..
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