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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Inverto black ultra feedhorn .. F/d ??
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<blockquote data-quote="Channel Hopper" data-source="post: 1064351" data-attributes="member: 175144"><p>I've cut the feed off a few LNBFs in the past year and all look roughly the same in terms of feed angle, number of scalar rings and casting marks. The only changes that are plainly visible are the throat diameter (the Invertos use a smaller measurement, presumably to enhance the upper band) and the depth of the throat itself, which is in the main to allow a better - read more universal - focal point adjustment to multiple reflectors.</p><p></p><p>I do not know of many domestic offset dish designs that stray from a focal distance f/d ratio of 0.65-0.7 meaning an illumination of approximately 70 degrees at centre point. For professional dishes however this is too wide, the maximum on a Prodelin dish is 51 degrees (0.6 f/d), with 39 degrees (or f/d 0.8) being the Ku standard for certified transmission characteristics, preventing trouble with adjacent satellites.</p></blockquote><p></p>
[QUOTE="Channel Hopper, post: 1064351, member: 175144"] I've cut the feed off a few LNBFs in the past year and all look roughly the same in terms of feed angle, number of scalar rings and casting marks. The only changes that are plainly visible are the throat diameter (the Invertos use a smaller measurement, presumably to enhance the upper band) and the depth of the throat itself, which is in the main to allow a better - read more universal - focal point adjustment to multiple reflectors. I do not know of many domestic offset dish designs that stray from a focal distance f/d ratio of 0.65-0.7 meaning an illumination of approximately 70 degrees at centre point. For professional dishes however this is too wide, the maximum on a Prodelin dish is 51 degrees (0.6 f/d), with 39 degrees (or f/d 0.8) being the Ku standard for certified transmission characteristics, preventing trouble with adjacent satellites. [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Inverto black ultra feedhorn .. F/d ??
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