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DISH SETUP: Single sat, Multi-Sat & Motorised
2.2mtr Elite / Precision resurection... Part 2.
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<blockquote data-quote="Channel Hopper" data-source="post: 1010058" data-attributes="member: 175144"><p>Sorry, the scalar feed in all the - prime focus - dishes I have installed is to aid in the alignment of the incoming signals in an imperfect matched system. There is an improvement in overall S/N ratio in almost all cases by under illuminating the dish.</p><p></p><p>There are secondary improvements in the use of concentric ring system, but from memory the use of accurate mathematics of the wave front directly at the front of the focal point on a parabolic antenna is there to improve the lower frequencies that can be received, offsetting the smaller throat of the feed that raises the centre frequency of the band of interest, waveguide dimensions and the detection system employed.</p><p></p><p>I will have to go check back through the college notes to be absolutely sure though as I have been out of mechanical reflector designs for a number of years.</p></blockquote><p></p>
[QUOTE="Channel Hopper, post: 1010058, member: 175144"] Sorry, the scalar feed in all the - prime focus - dishes I have installed is to aid in the alignment of the incoming signals in an imperfect matched system. There is an improvement in overall S/N ratio in almost all cases by under illuminating the dish. There are secondary improvements in the use of concentric ring system, but from memory the use of accurate mathematics of the wave front directly at the front of the focal point on a parabolic antenna is there to improve the lower frequencies that can be received, offsetting the smaller throat of the feed that raises the centre frequency of the band of interest, waveguide dimensions and the detection system employed. I will have to go check back through the college notes to be absolutely sure though as I have been out of mechanical reflector designs for a number of years. [/QUOTE]
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DISH SETUP: Single sat, Multi-Sat & Motorised
2.2mtr Elite / Precision resurection... Part 2.
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