Thread: Signal Strength

Results 1 to 9 of 9
  1. Collapse Details
    Signal Strength
    #1
    Join Date
    Nov 2017
    Posts
    17
    Post Thanks / Like
    Contribute If you enjoy reading the
    content here, click the below
    image to support our site.
    Click Here To Contribute To Our Site
    Is this normal for signal to be this low, I have a well tuned dish
    lowest I've seen on a receiver
    Not a big deal, this receiver seems to have a pretty sensitive tuner

    [Only registered and activated users can see links. ]
    Reply With Quote
     

  2. Thanks el bandido thanked for this post
  3. Collapse Details
    #2
    Join Date
    Dec 2010
    Location
    Atlanta, Ga.
    Posts
    6,767
    Post Thanks / Like
    What satellite?
    What is the dish size?
    What type of lnb? Make/Model?
    Why are you not using SNR in db instead of SNR in %?
    Reply With Quote
     

  4. Collapse Details
    #3
    Join Date
    Nov 2017
    Posts
    17
    Post Thanks / Like
    Ses1
    12 ft.
    Norsat 3220
    I will have to find this setting to change it
    Reply With Quote
     

  5. Collapse Details
    #4
    Join Date
    Dec 2010
    Location
    Atlanta, Ga.
    Posts
    6,767
    Post Thanks / Like
    Set Force legacy signal stats to no. That should fix it.

    [Only registered and activated users can see links. ]
    Reply With Quote
     

  6. Thanks WaMan, ViP3R thanked for this post
    Likes WaMan liked this post
  7. Collapse Details
    #5
    Join Date
    Nov 2017
    Posts
    17
    Post Thanks / Like
    That did the trick
    Reply With Quote
     

  8. Thanks ViP3R thanked for this post
  9. Collapse Details
    #6
    Join Date
    May 2016
    Posts
    93
    Post Thanks / Like
    And a quick note, signal strength (S) is not the strength of the signal from the satellite, but the strength of the down-converted signal from the LNB's output to the receiver.

    It can be as low as 40% and still work, what you want is the "Q" to be as high as possible, and these measurements are all calculated internally by software at the receiver, the true measurement of whats coming down from the satellite would be the internal RSSI on the LNB's internal AGC voltage controlled amp, this could be converted to dBpV.
    Reply With Quote
     

  10. Thanks el bandido, ViP3R thanked for this post
  11. Collapse Details
    #7
    Join Date
    Dec 2010
    Location
    Atlanta, Ga.
    Posts
    6,767
    Post Thanks / Like
    Enigma2 does not have the signal strength (S) feature.
    Some of the earlier skins would show the S signal, but I have not seen that feature in years.

    Enigma2 receivers will show the signal strength as SNR(%) or SNR(DB). References are made in programming that refer to the SNR(%) as the signal Quality.
    Reply With Quote
     

  12. Thanks ViP3R thanked for this post
  13. Collapse Details
    #8
    Join Date
    May 2016
    Posts
    93
    Post Thanks / Like
    OK, but it still comes from the same RSSI voltage in the receivers tuner, that voltage is run into an A to D converter and that digital data used by software to give you something to look at.

    It is not a true SNR reading of the signals coming down from a satellite, you would need a very special LNB, locked onto a reference signal on a transponder to get that.

    How you measure true SNR on an RF system is to first establish a reference signal giving you a starting point on a spectrum analyzer, (lets say 0 dBm) then remove that signal, and read the remainder,(lets say it drops to -60 dBm) this would give you the noise floor reading of whats left, or an SNR of 60 dB, or if your design noise floor is lets say 100 dB, then your SNR in percentage is 60%.

    Audio SNR is done the same way.

    For an off the shelf consumer satellite receiver to do a true SNR reading, it would have to know all the system gains and losses, and what the starting point reference signal is, and how to shut it off, all your looking at is a software defined reading based on some voltage coming from a tuners AGC circuit.
    Last edited by Terryl; 01-21-2020 at 10:51 AM.
    Reply With Quote
     

  14. Thanks ViP3R, el bandido thanked for this post
  15. Collapse Details
    #9
    Join Date
    Dec 2010
    Location
    Atlanta, Ga.
    Posts
    6,767
    Post Thanks / Like
    We know it is not 100% accurate. But it is better than nothing.
    Reply With Quote
     

  16. Thanks ViP3R thanked for this post
    Likes norman881 liked this post

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •