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
Feedhorn ident
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="RimaNTSS" data-source="post: 904597" data-attributes="member: 312276"><p>I do not know how to measure feedhorn illumination angle, but know for sure that my 1,8m Prodelins have opening angle ~80*. I also have one original feedhorn, by using it I get quiet good performance. I suspect that feedhorn can not have 51* or 39*illumination angle!</p><p>I just made small picture where Pink is prime-focus dish with 128* opening angle and F/D ratio about 0,6.</p><p>If we make Blue offset dish out of it than it also has F/D 0,6 and opening angle about 63*.</p><p>Lets make another cut of parabola- Green offset dish. This dish will also has F/D ratio 0,6, but only 56* opening angle. </p><p>Therefore, F/D ratio gives us nothing when we are in offset setup. </p><p>[ATTACH]69847[/ATTACH]</p></blockquote><p></p>
[QUOTE="RimaNTSS, post: 904597, member: 312276"] I do not know how to measure feedhorn illumination angle, but know for sure that my 1,8m Prodelins have opening angle ~80*. I also have one original feedhorn, by using it I get quiet good performance. I suspect that feedhorn can not have 51* or 39*illumination angle! I just made small picture where Pink is prime-focus dish with 128* opening angle and F/D ratio about 0,6. If we make Blue offset dish out of it than it also has F/D 0,6 and opening angle about 63*. Lets make another cut of parabola- Green offset dish. This dish will also has F/D ratio 0,6, but only 56* opening angle. Therefore, F/D ratio gives us nothing when we are in offset setup. [ATTACH]69847[/ATTACH] [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Feedhorn ident
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