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
Satellite Systems - What to Buy - What to install
Fine adjustment of Lnbs
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="clarke belt" data-source="post: 4608"><p>Since Sirius at 5degs east recently became of interest due to the ability to watch channels there,lots of people have been looking for ways to improve their systems after finding some of the channels quite weak and some not receivable at all.</p><p></p><p>The obvious way to achieve this is to buy a larger dish but that creates all kinds of problems not the least the cost.</p><p>At one time not too long ago virtually all motorised systems used a seperate Lnb and feedhorn and the receivers were equiped with polarisers terminals and its not until you have seen the difference that a fine adjustment to skew can make on a weak signal that you realise the popular voltage controlled H/V system that most of us use now is not the best and was basically just intended for strong Astra reception.</p><p></p><p>The reason why a polarisation offset occurs is quite complex and beyond the scope of this post, but it is sufficient to say it is a factor and something can be done about it.</p><p></p><p>I had a browse through What Sat mag to see how many of the new digital receivers have incremental polariser control and was suprised to find quite a lot,but I suspect a large number of them are not being used.</p><p></p><p>Its much better to use receiver programmable per channel skew values and present systems use a non moveable ferrite polariser which fits beteen the feedhorn and the Lnb, this does introduce a small insertion loss but the reliability of the settings and the menu controlled fine settings makes it a must for situations like Sirius,and as a DXer I'v used it for a long time with very weak signals which on a standard system would remain weak and nothing more to be done to improve them.</p><p></p><p>clarke belt.</p></blockquote><p></p>
[QUOTE="clarke belt, post: 4608"] Since Sirius at 5degs east recently became of interest due to the ability to watch channels there,lots of people have been looking for ways to improve their systems after finding some of the channels quite weak and some not receivable at all. The obvious way to achieve this is to buy a larger dish but that creates all kinds of problems not the least the cost. At one time not too long ago virtually all motorised systems used a seperate Lnb and feedhorn and the receivers were equiped with polarisers terminals and its not until you have seen the difference that a fine adjustment to skew can make on a weak signal that you realise the popular voltage controlled H/V system that most of us use now is not the best and was basically just intended for strong Astra reception. The reason why a polarisation offset occurs is quite complex and beyond the scope of this post, but it is sufficient to say it is a factor and something can be done about it. I had a browse through What Sat mag to see how many of the new digital receivers have incremental polariser control and was suprised to find quite a lot,but I suspect a large number of them are not being used. Its much better to use receiver programmable per channel skew values and present systems use a non moveable ferrite polariser which fits beteen the feedhorn and the Lnb, this does introduce a small insertion loss but the reliability of the settings and the menu controlled fine settings makes it a must for situations like Sirius,and as a DXer I'v used it for a long time with very weak signals which on a standard system would remain weak and nothing more to be done to improve them. clarke belt. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Satellite TV receivers & systems support forums
Satellite Systems - What to Buy - What to install
Fine adjustment of Lnbs
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