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<blockquote data-quote="moonbase" data-source="post: 1075954" data-attributes="member: 178786">I started off with the LNB in the AV-COMM polo pipe but was getting some cross polarisation. I swapped out the AV-COMM polo pipe for a &quot;non polo pipe&quot; that has no steps in it. This acted as a feed throat extender and allowed me to get the throat aperture at the focal distances required.The feed holder that I use for C-Band places an LNBF feed throat aperture too far away (780mm) from the focal point (aperture at ~ 745mm) so I need to use a strap on extension.&nbsp; <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite12" alt="o_O" title="Er... what?&nbsp; &nbsp; o_O" loading="lazy" data-shortname="o_O" />I have attached a pic of the non polo pipe feed arrangement below, it is not a good picture but it illustrates the principle..[ATTACH=full]125992[/ATTACH]</blockquote>

[QUOTE="moonbase, post: 1075954, member: 178786"] I started off with the LNB in the AV-COMM polo pipe but was getting some cross polarisation. I swapped out the AV-COMM polo pipe for a "non polo pipe" that has no steps in it. This acted as a feed throat extender and allowed me to get the throat aperture at the focal distances required. The feed holder that I use for C-Band places an LNBF feed throat aperture too far away (780mm) from the focal point (aperture at ~ 745mm) so I need to use a strap on extension. o_O I have attached a pic of the non polo pipe feed arrangement below, it is not a good picture but it illustrates the principle. . [ATTACH type="full"]125992[/ATTACH] [/QUOTE]

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