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Fringe Reception General
Made a start on my petal extensions ..
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<blockquote data-quote="Vipersan" data-source="post: 807061" data-attributes="member: 325666"><p>...Well prompted by CH ...and I did need a kick up the proverbial to get back on course ..</p><p>I calculated that the petals needed more tilt some time ago ..</p><p>About 1cm lift per wing..in order to make the dish a little deeper ..and get the focal length back to roughly where it _should_ have been ...ie 82 cm ..</p><p>currently calculations show it to be about 84 >85 ..which is too far out really to make all of each petal efficient..</p><p>So a simple experiment to prove my calcs and estimates are correct.</p><p>First I pointed Christina at TPC at 0.8w...</p><p>And a photo taken ...currently showing it at 6.1 > 6.2 db..</p><p>Nothing changed position wise ...just 2 of the non tripod bearing wings were released...allowing the tilt angle to be changed by about 1cm each</p><p>See photos ..</p><p>These were prevented from sagging back by a couple of bolts through the lateral holes..</p><p>I then nipped indoors and took another photo ..</p><p>Just 2 wings lifted and the signal level had risen from 6.2 db to at least 6.6 db occasionally 6.7</p><p>again ..see photos..</p><p>Totally conclusive that although very pretty ...more work to adjust the wings is needed.</p><p>But I've known this for some time ...and discussed it with Nelson last time he visited.</p><p>I'm not too well atm ..but if the weather stays ok ..I'll have to make a start..</p><p>Those pips wont squeeze themselves ya know..</p><p>rgds</p><p>VS</p></blockquote><p></p>
[QUOTE="Vipersan, post: 807061, member: 325666"] ...Well prompted by CH ...and I did need a kick up the proverbial to get back on course .. I calculated that the petals needed more tilt some time ago .. About 1cm lift per wing..in order to make the dish a little deeper ..and get the focal length back to roughly where it _should_ have been ...ie 82 cm .. currently calculations show it to be about 84 >85 ..which is too far out really to make all of each petal efficient.. So a simple experiment to prove my calcs and estimates are correct. First I pointed Christina at TPC at 0.8w... And a photo taken ...currently showing it at 6.1 > 6.2 db.. Nothing changed position wise ...just 2 of the non tripod bearing wings were released...allowing the tilt angle to be changed by about 1cm each See photos .. These were prevented from sagging back by a couple of bolts through the lateral holes.. I then nipped indoors and took another photo .. Just 2 wings lifted and the signal level had risen from 6.2 db to at least 6.6 db occasionally 6.7 again ..see photos.. Totally conclusive that although very pretty ...more work to adjust the wings is needed. But I've known this for some time ...and discussed it with Nelson last time he visited. I'm not too well atm ..but if the weather stays ok ..I'll have to make a start.. Those pips wont squeeze themselves ya know.. rgds VS [/QUOTE]
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Fringe Reception General
Made a start on my petal extensions ..
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