Reply to thread

Message: <blockquote data-quote="Channel Hopper" data-source="post: 1020345" data-attributes="member: 175144">It is a modification that normally gets used on a small prime focus dish to reduce the shadow of the scalar feed.The foam has two properties in this case, providing a better match to the reflector shape than a scalar feed, and to act as a holster for the rivets, which by their shape act as 'stubs', which are also a method of reducing some of the mismatch between the components in the installation.The owner probably had no supply of an offset feedhorn and adapter to clamp on the boom arm, which would most likely give similar improvements over a flat scalar system.</blockquote>