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Satellite TV receivers & systems support forums
Fringe Reception General
Made a start on my petal extensions ..
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<blockquote data-quote="Vipersan" data-source="post: 798357" data-attributes="member: 325666"><p>Thanks Joddle...</p><p>Well aware of the feed horn issues ..which is why I took 2 months to make an adjustable scalar feed before I attempted the panel extensions ..</p><p>However ..no point in playing around with this aspect of the build ..until the focal length is correctly established ..</p><p>The adjustable feed is just the icing on the cake ..as it were.</p><p></p><p>Ok ..still one panel missing ..and there are some quirks noticeable already ..</p><p>I noticed a slight _drop_ in gain since the 5th panel was fitted..</p><p>My theory fwiw is that the focus is close..so close in fact that there are now standing wave interferences accumilating at or near the focus ..thus reducing some channels reception ..yet building others.</p><p>As an example of this ..</p><p>I went over 13db on startimes 10E with 4 panels ..but cannot get above 12.5 with the 5th panel added.</p><p>However ...I just locked in CDM -4169 V</p><p>tp 23 CDM Internacional </p><p>DVB-S 3000-3/4</p><p>at 58West ..</p><p>I don't remember _ever_ locking this before ..and now its locked and stable</p><p>here are the pics.</p><p></p><p>So quirks a plenty ..but then ..the feed assembly has been barely touched yet..</p><p>the focal length has yet to be established and optimised..</p><p>and...</p><p>there is still a panel missing..</p><p>rgds</p><p>VS</p></blockquote><p></p>
[QUOTE="Vipersan, post: 798357, member: 325666"] Thanks Joddle... Well aware of the feed horn issues ..which is why I took 2 months to make an adjustable scalar feed before I attempted the panel extensions .. However ..no point in playing around with this aspect of the build ..until the focal length is correctly established .. The adjustable feed is just the icing on the cake ..as it were. Ok ..still one panel missing ..and there are some quirks noticeable already .. I noticed a slight _drop_ in gain since the 5th panel was fitted.. My theory fwiw is that the focus is close..so close in fact that there are now standing wave interferences accumilating at or near the focus ..thus reducing some channels reception ..yet building others. As an example of this .. I went over 13db on startimes 10E with 4 panels ..but cannot get above 12.5 with the 5th panel added. However ...I just locked in CDM -4169 V tp 23 CDM Internacional DVB-S 3000-3/4 at 58West .. I don't remember _ever_ locking this before ..and now its locked and stable here are the pics. So quirks a plenty ..but then ..the feed assembly has been barely touched yet.. the focal length has yet to be established and optimised.. and... there is still a panel missing.. rgds VS [/QUOTE]
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Fringe Reception General
Made a start on my petal extensions ..
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