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
Fringe Reception General
0.01dB lnb?
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="Hitchcock" data-source="post: 190865" data-attributes="member: 196478"><p>Do you know exactly how they measure the noise? I'm curious because SMW do also make those X-Line (old Wideband type) LNBs, and for many years* they were quoted as having a noise figure of 0.6 dB (actually those are the ones I said appeared in 1995) whilst the newer WDL ones, and also the Quattro (= OMT + 2 WDLs), were only rated at 0.8 dB and when I asked SMW about this, they told me that they were in fact all of them (X-Line, WDL/Quattro) using the same transistors, it was just that the design of the WDL/Quattro was different or sth (he didn't really give me a good answer that day, herr M**** Kj******* <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" />).</p><p></p><p><span style="font-size: 9px">* To my surprise their noise figure </span><span style="font-size: 9px">is </span><span style="font-size: 9px">now only quoted as typical 0.8 dB, whilst the WDL NF is </span><span style="font-size: 9px">still </span><span style="font-size: 9px">quoted as 0.8 dB as before, but the Quattro has gone up from 0.8 dB to 0.9 dB! So have their LNBs suddenly become poorer now (poorer manufacturing), or have they changed the way they measure the NF (yet again, to their disadvantage?) or what? <span style="font-size: 9px"><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite53" alt=":confused" title="Confused :confused" loading="lazy" data-shortname=":confused" /></span></span></p><p><span style="font-size: 9px"></span> </p><p> </p><p>I wish I had the equipment, I would be bery keen to conduct this sort of experiment.</p><p></p><p> </p><p>Well, according to the formula I use (and ouagadougou too, as I can see from his last post), if you DO remove the noise (T = 0), then C/N suddenly becomes quite large ... :-hammer</p><p></p><p>(I do stand open for correction though, maybe I'm using an oversimplified formula.)</p><p></p><p></p><p>Spiney, do you know how much noise (in Kelvin) we could be talking about with one of those masers? Do you think it could ever be made available to us consumers? (Perhaps this is what the MOD or DOD use?)</p><p></p><p>An LNB with a genuine noise figure of just 0.1 (not 0.01) would really make a world of difference. For me and the Invacom I'm currently using it would be like quintupling (yes, that is 5 times) the area of my dish (more than doubling the diameter).</p></blockquote><p></p>
[QUOTE="Hitchcock, post: 190865, member: 196478"] Do you know exactly how they measure the noise? I'm curious because SMW do also make those X-Line (old Wideband type) LNBs, and for many years* they were quoted as having a noise figure of 0.6 dB (actually those are the ones I said appeared in 1995) whilst the newer WDL ones, and also the Quattro (= OMT + 2 WDLs), were only rated at 0.8 dB and when I asked SMW about this, they told me that they were in fact all of them (X-Line, WDL/Quattro) using the same transistors, it was just that the design of the WDL/Quattro was different or sth (he didn't really give me a good answer that day, herr M**** Kj******* :D). [SIZE=1]* To my surprise their noise figure [/SIZE][SIZE=1]is [/SIZE][SIZE=1]now only quoted as typical 0.8 dB, whilst the WDL NF is [/SIZE][SIZE=1]still [/SIZE][SIZE=1]quoted as 0.8 dB as before, but the Quattro has gone up from 0.8 dB to 0.9 dB! So have their LNBs suddenly become poorer now (poorer manufacturing), or have they changed the way they measure the NF (yet again, to their disadvantage?) or what? [SIZE=1]:confused:[/SIZE] [/SIZE] I wish I had the equipment, I would be bery keen to conduct this sort of experiment. Well, according to the formula I use (and ouagadougou too, as I can see from his last post), if you DO remove the noise (T = 0), then C/N suddenly becomes quite large ... :-hammer (I do stand open for correction though, maybe I'm using an oversimplified formula.) Spiney, do you know how much noise (in Kelvin) we could be talking about with one of those masers? Do you think it could ever be made available to us consumers? (Perhaps this is what the MOD or DOD use?) An LNB with a genuine noise figure of just 0.1 (not 0.01) would really make a world of difference. For me and the Invacom I'm currently using it would be like quintupling (yes, that is 5 times) the area of my dish (more than doubling the diameter). [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Satellite TV receivers & systems support forums
Fringe Reception General
0.01dB lnb?
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