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="Terryl" data-source="post: 1008440" data-attributes="member: 369937"><p>The best way is to use a calibrated RF signal generator, setup for a 75 ohm inductance, this way you know exactly how much signal is getting to the tuner.</p><p></p><p>What we used was a RF generator connected to a calibrated transmit antenna, (you know the exact gain of the antenna at that frequency) that way you know one part of the formula (X+Y) and we set the antenna at an exact distance from the dish, LNB and receiver under test, this gives you a calibrated input signal.</p><p></p><p>You can delete the antenna and LNB and use the frequency of the down-converted IF signals for the transponders, (10200 MHz to 11250 MHz -minus the LO in MHz = IF signal) so for a given IF signal at lets say at -50 dBm into the tuner equals 75% on one receiver (guessing) and 78% on another, then you have a direct calibrated comparison on a known signal.</p></blockquote><p></p>
[QUOTE="Terryl, post: 1008440, member: 369937"] The best way is to use a calibrated RF signal generator, setup for a 75 ohm inductance, this way you know exactly how much signal is getting to the tuner. What we used was a RF generator connected to a calibrated transmit antenna, (you know the exact gain of the antenna at that frequency) that way you know one part of the formula (X+Y) and we set the antenna at an exact distance from the dish, LNB and receiver under test, this gives you a calibrated input signal. You can delete the antenna and LNB and use the frequency of the down-converted IF signals for the transponders, (10200 MHz to 11250 MHz -minus the LO in MHz = IF signal) so for a given IF signal at lets say at -50 dBm into the tuner equals 75% on one receiver (guessing) and 78% on another, then you have a direct calibrated comparison on a known signal. [/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