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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
A 3.7m Prodeline dish for Astra 2D
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<blockquote data-quote="pjgregory" data-source="post: 558465" data-attributes="member: 288654"><p>Some more thoughts</p><p></p><p>1. The Channel Master 1.2m dish has a published mid point Ku band gain of 42dB, while that of the Prodeline 3.7m dish is 50.7dB. So I should have an increase of some 8.7dB. The measured improvement in gain with the same LNB etc. at 10964H is only 3.8dB so unless the published figures are wrong, I am still missing some gain - maybe the focus issue?</p><p></p><p>2. On the question of the focus, while it was easy to simply drill out the supplied Prodeline feed horn to take the Invacom horn, the range of focus was in the end limited to about 1.5cm. If I started again, I would follow Channel Hoppers advice and make a new flat aluminum plate instead with a boss to hold the Invacom horn. This would give me a much wider range of focus positions.</p><p></p><p>3. Using the modified Prodeline horn also gave another problem. Corviello brough with him a much larger "Cyprus" scaler ring, but it would not fit in front of the mount so I was unable to see if it would improve the signal. Using a flat mounting plate with the four legs spread wider apart would have have allowed me to try the larger ring.</p><p></p><p>PJG</p></blockquote><p></p>
[QUOTE="pjgregory, post: 558465, member: 288654"] Some more thoughts 1. The Channel Master 1.2m dish has a published mid point Ku band gain of 42dB, while that of the Prodeline 3.7m dish is 50.7dB. So I should have an increase of some 8.7dB. The measured improvement in gain with the same LNB etc. at 10964H is only 3.8dB so unless the published figures are wrong, I am still missing some gain - maybe the focus issue? 2. On the question of the focus, while it was easy to simply drill out the supplied Prodeline feed horn to take the Invacom horn, the range of focus was in the end limited to about 1.5cm. If I started again, I would follow Channel Hoppers advice and make a new flat aluminum plate instead with a boss to hold the Invacom horn. This would give me a much wider range of focus positions. 3. Using the modified Prodeline horn also gave another problem. Corviello brough with him a much larger "Cyprus" scaler ring, but it would not fit in front of the mount so I was unable to see if it would improve the signal. Using a flat mounting plate with the four legs spread wider apart would have have allowed me to try the larger ring. PJG [/QUOTE]
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Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
A 3.7m Prodeline dish for Astra 2D
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