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 PC Card Receivers, Internet by Satellite
Comparing sensitivity
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="jeallen01" data-source="post: 1008448" data-attributes="member: 176704"><p>And then there is the sample-to-sample variation issue for a wide range of possible reasons - components, assembly personnel, "day of the week", quality assurance thoroughness, etc.</p><p></p><p>For example: there used to be a long running discussion on LNB sensitivity, with known significant variations in the performance of units all specified as being "0.1dB" whereby they were sometimes even worse than some 0.2dB or higher units. Don't forget that people writing the advertising specs will always try to put their products in the best light as compared with those from their competitors - but generally without stating whether the measurements were taken under comparable test conditions.</p><p></p><p>So, it's always going to be a bit of a gamble with kit working "right on the edge" of its performance limits - and the best you can probably do is to look for product specs and reviews, and ask for opinions on particular equipment, as well as very carefully adjusting your particular dish/lnb motor setups (unless of course you have the capability and time to carry out back-to-back tests of the possible candidate receivers).</p><p></p><p>Also, when a very weak transponder signal is right on the "limit" of readability, the weather, or other atmospheric/stratospheric/solar conditions, can come into play for either/both the uplink or downlink signals, and there is also the "satellite orbital wobble" issue which can slightly deflect the beams, and one/many/all of these factors can affect whether the signal is receivable or not at a particular time.</p></blockquote><p></p>
[QUOTE="jeallen01, post: 1008448, member: 176704"] And then there is the sample-to-sample variation issue for a wide range of possible reasons - components, assembly personnel, "day of the week", quality assurance thoroughness, etc. For example: there used to be a long running discussion on LNB sensitivity, with known significant variations in the performance of units all specified as being "0.1dB" whereby they were sometimes even worse than some 0.2dB or higher units. Don't forget that people writing the advertising specs will always try to put their products in the best light as compared with those from their competitors - but generally without stating whether the measurements were taken under comparable test conditions. So, it's always going to be a bit of a gamble with kit working "right on the edge" of its performance limits - and the best you can probably do is to look for product specs and reviews, and ask for opinions on particular equipment, as well as very carefully adjusting your particular dish/lnb motor setups (unless of course you have the capability and time to carry out back-to-back tests of the possible candidate receivers). Also, when a very weak transponder signal is right on the "limit" of readability, the weather, or other atmospheric/stratospheric/solar conditions, can come into play for either/both the uplink or downlink signals, and there is also the "satellite orbital wobble" issue which can slightly deflect the beams, and one/many/all of these factors can affect whether the signal is receivable or not at a particular time. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Satellite TV receivers & systems support forums
Satellite PC Card Receivers, Internet by Satellite
Comparing sensitivity
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