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<blockquote data-quote="Channel Hopper" data-source="post: 625424" data-attributes="member: 175144">Largest one I know (and have worked with) is a 3.8m (four piece configuration).Feeds are designed around the antenna design. A prime focus feed requires signals from what is effectively a deep dish, (up to 0.3 or 0.35 f/d) and so the scalar system is more efficient using a set of rings on a planar surface. With an offset dish (where the focal point is identical, but the antenna reflector is a fraction of the original template of the prime focus design) the needs of the feed are not only to receive the signals, but to reject the outside noise. In this case a horn becomes a better collector of signal.Please note the above is for microwave signals, once the frequency needs drop to below C Band, the yagi becomes a suitable candidate for efficient reception. On, and above Ku band frequencies, other direct means of receptor can be as good as a set of scalar rings.</blockquote>

[QUOTE="Channel Hopper, post: 625424, member: 175144"] Largest one I know (and have worked with) is a 3.8m (four piece configuration). Feeds are designed around the antenna design. A prime focus feed requires signals from what is effectively a deep dish, (up to 0.3 or 0.35 f/d) and so the scalar system is more efficient using a set of rings on a planar surface. With an offset dish (where the focal point is identical, but the antenna reflector is a fraction of the original template of the prime focus design) the needs of the feed are not only to receive the signals, but to reject the outside noise. In this case a horn becomes a better collector of signal. Please note the above is for microwave signals, once the frequency needs drop to below C Band, the yagi becomes a suitable candidate for efficient reception. On, and above Ku band frequencies, other direct means of receptor can be as good as a set of scalar rings. [/QUOTE]

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