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DISH SETUP: Single sat, Multi-Sat & Motorised
Advice on 1.9m prime focus dish & 4.8'e
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<blockquote data-quote="Channel Hopper" data-source="post: 1033180" data-attributes="member: 175144"><p>You are aware that the feed centre point has to be on the central line of the reflector, boresight and for full efficiency you have to ensure the feed is perfectly aligned with the perpendicular axis of the reflector surface, no margin for error.</p><p></p><p>Additionally the screw in/out part of those feeds has to mimic the focal point of the dish, so alignment is done with extending the feed arms to the optimum distance and then adjusting the scalar by turning the thread. It does take a number of small adjustments to get right, especiially with a feed arm system like yours that has three reflector bolt holes that require synchrony in where they need to be tightened.</p><p></p><p>In cases like this, I would conclude that if you have done the above as best you can and without firm measurements with an analyser, the reflector is sending received signals everywhere, both to the feedhorn but also elsewhere and no matter how many adjustments you might make, the dish parabola will not perform any better than you currently get without distorting it.</p><p></p><p>It could be you have a defective or 'second' manufacture dish or feedhorn but only a proper check with the right equipment is going to give you an answer.</p><p></p><p>Where did you get it and how was it advertised ?</p></blockquote><p></p>
[QUOTE="Channel Hopper, post: 1033180, member: 175144"] You are aware that the feed centre point has to be on the central line of the reflector, boresight and for full efficiency you have to ensure the feed is perfectly aligned with the perpendicular axis of the reflector surface, no margin for error. Additionally the screw in/out part of those feeds has to mimic the focal point of the dish, so alignment is done with extending the feed arms to the optimum distance and then adjusting the scalar by turning the thread. It does take a number of small adjustments to get right, especiially with a feed arm system like yours that has three reflector bolt holes that require synchrony in where they need to be tightened. In cases like this, I would conclude that if you have done the above as best you can and without firm measurements with an analyser, the reflector is sending received signals everywhere, both to the feedhorn but also elsewhere and no matter how many adjustments you might make, the dish parabola will not perform any better than you currently get without distorting it. It could be you have a defective or 'second' manufacture dish or feedhorn but only a proper check with the right equipment is going to give you an answer. Where did you get it and how was it advertised ? [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Advice on 1.9m prime focus dish & 4.8'e
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