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
Multifeed installation and exact calculation of LNB position
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="davemurgtroyd" data-source="post: 957588" data-attributes="member: 319227"><p>Firstly a dish is a 3 dimensional paraboloid and its focal point will be on a straight line for any particular source and as the sources in this case are in an arc the focal points for each source (satellite) will also be on a curved plane - think of car headlights - the "main beam" filament is at the prime focal point and projects a beam straight ahead and level whereas the "dipped beam" filament is offset to the side and upwards and thus projects a beam downwards and to the side (by your logic the "dipped beam" would also be level and merely pointed to the side)..</p><p></p><p>You are only considering 2d parabolas and not 3d paraboloids.</p></blockquote><p></p>
[QUOTE="davemurgtroyd, post: 957588, member: 319227"] Firstly a dish is a 3 dimensional paraboloid and its focal point will be on a straight line for any particular source and as the sources in this case are in an arc the focal points for each source (satellite) will also be on a curved plane - think of car headlights - the "main beam" filament is at the prime focal point and projects a beam straight ahead and level whereas the "dipped beam" filament is offset to the side and upwards and thus projects a beam downwards and to the side (by your logic the "dipped beam" would also be level and merely pointed to the side).. You are only considering 2d parabolas and not 3d paraboloids. [/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
Multifeed installation and exact calculation of LNB position
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