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<blockquote data-quote="a33" data-source="post: 1098842" data-attributes="member: 332642">And cross-polarization of linear signals is a bit better than with offset dishes, I have read. (Don't know about circular signals.)For small PF dishes, the LNB is blocking the center of the dish, so that is not advantageous when the dish surface is already small.Finding (or checking) the focal point (for placing the LNB&nbsp; )&nbsp; however is much much easier with a PF dish.Well, I guess it started the other way round: The normal LNBs (for PF dishes) have a separate feedhorn, adjustable to the f/D of the dish.The 'special' LNB is for offset dishes, where they put a fixed feedhorn to it (called LNBf; f added for feedhorn, though most people simply continue to call them just LNB ). This feedhorn would be for the 'normal' f/D ratio for offset dishes: about 0.60 to 0.65.However as most people receive Ku-band with offset dishes, those 'special' LNBs are the ones that are in the majority nowadays...Greetz,A33</blockquote>

[QUOTE="a33, post: 1098842, member: 332642"] And cross-polarization of linear signals is a bit better than with offset dishes, I have read. (Don't know about circular signals.) For small PF dishes, the LNB is blocking the center of the dish, so that is not advantageous when the dish surface is already small. Finding (or checking) the focal point (for placing the LNB ) however is much much easier with a PF dish. Well, I guess it started the other way round: The [B]normal[/B] LNBs (for PF dishes) have a separate feedhorn, adjustable to the f/D of the dish. The [B]'special'[/B] LNB is for offset dishes, where they put a fixed feedhorn to it (called LNBf; f added for feedhorn, though most people simply continue to call them just LNB ). This feedhorn would be for the 'normal' f/D ratio for offset dishes: about 0.60 to 0.65. However as most people receive Ku-band with offset dishes, those 'special' LNBs are the ones that are in the majority nowadays... Greetz, A33 [/QUOTE]

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