Log in
Register
Menu
Log in
Register
Home
What's new
Latest activity
Authors
Forums
New posts
Search forums
What's new
New posts
Latest activity
Members
Current visitors
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Dish Setup Guides, Information threads and FAQs
Calculation of the focal length of an offset satellite dish antenna, Revisited
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="scottgs" data-source="post: 1151717" data-attributes="member: 419001"><p>Thank you for the reply. No, the dish is not warped, and well, I probably would have already thrown it out if it were. This is a high-quality deployable dish with a fiberglass honeycomb reinforced aluminium reflector. </p><p></p><p>In the context of this thread, "non-flat" means that it is not a plain circular section of a paraboloid, and thus if the dish were be set face down on a plane, the rim of the dish will be higher across one dimension (for example top to bottom), than it is the other dimension (for example side to side). This is unlike a typical (and much more common) offset dish which would lie completely flat across it's entire circumference. Dishes are sometimes designed this way to provide for advantageous physical and practical geometry, including unique optimizations of feed-point and beam-width. Common examples would be Aviation and Defence radars, such as airport surveillance radars. However, in the context of this thread, this is not to included wide-azimuth view dishes intended for multi-feed applications, (as is common with direct TV broadcast services), but rather, the thread appears intended to address single-focus, single-feed applications only. Please look at post #2 and number #5 in this thread for some insight into the geometry of non-flat paraboloidal reflectors.</p><p></p><p>I'm just trying to flow with the original intent of this thread, with a practical application which would also be very helpful to me, as well as perhaps helping to validate the original poster/author's goals (member A33), while also contributing and perhaps helping others in the future. </p><p></p><p>I'll post some photos soon. </p><p></p><p>Garret</p><p>W8BUG</p></blockquote><p></p>
[QUOTE="scottgs, post: 1151717, member: 419001"] Thank you for the reply. No, the dish is not warped, and well, I probably would have already thrown it out if it were. This is a high-quality deployable dish with a fiberglass honeycomb reinforced aluminium reflector. In the context of this thread, "non-flat" means that it is not a plain circular section of a paraboloid, and thus if the dish were be set face down on a plane, the rim of the dish will be higher across one dimension (for example top to bottom), than it is the other dimension (for example side to side). This is unlike a typical (and much more common) offset dish which would lie completely flat across it's entire circumference. Dishes are sometimes designed this way to provide for advantageous physical and practical geometry, including unique optimizations of feed-point and beam-width. Common examples would be Aviation and Defence radars, such as airport surveillance radars. However, in the context of this thread, this is not to included wide-azimuth view dishes intended for multi-feed applications, (as is common with direct TV broadcast services), but rather, the thread appears intended to address single-focus, single-feed applications only. Please look at post #2 and number #5 in this thread for some insight into the geometry of non-flat paraboloidal reflectors. I'm just trying to flow with the original intent of this thread, with a practical application which would also be very helpful to me, as well as perhaps helping to validate the original poster/author's goals (member A33), while also contributing and perhaps helping others in the future. I'll post some photos soon. Garret W8BUG [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Dish Setup Guides, Information threads and FAQs
Calculation of the focal length of an offset satellite dish antenna, Revisited
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
Accept
Learn more…
Top