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Message: <blockquote data-quote="Analoguesat" data-source="post: 779380" data-attributes="member: 176362">Analogue man ???? <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin    :D" loading="lazy" data-shortname=":D" />Unless its a decent quality dish its probably performing about like a 1.1m! Sight across it and see if the face is warped. then string the dish - put 3 cotton threads across it and see if they all meet in the middle with minimal gaps between the threads.There is also the problem that big dishes are difficult to set up well unless you know what you are doing.</blockquote>