sl3s + 21v pi + frequency sweep from 150mhz to 2150mhz

Discussion in 'DIRECTV General Discussion' started by tdbone1, Jan 21, 2019.

  1. James Long

    James Long Ready for Uplink! Staff Member Super Moderator DBSTalk Club

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    So your test results showed that the ports were labeled correctly. :D
     
  2. slice1900

    slice1900 Well-Known Member

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    Not sure what you are hoping to find, as James Long said the damn thing is labeled for your convenience so you know exactly what each port will output!
     
  3. P Smith

    P Smith Mr. FixAnything

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    now put a splitter(s) on each of LNBF outputs going to SWM16 and show us spectrums (from 250MHz to 3 GHz) from all cables
     
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  4. tdbone1

    tdbone1 Member

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    exactly but i only have two of the "MSPLIT8R1-03"
    i have others but splitter = directional coupler with dc block?
    also i found this site
    Google Translate
    there is some good stuff in that thread.
    "
    The KA signal at 19.2 º east falls into the Ka-A band, for which a B-BandConverter (BBC) must be used in line with the coax. (Called SUP2400)

    To make this active, a special DiseqC command must be sent, something our receivers can not do, some PC Sat cards do.

    But there is a manual to change internally so that the BBC is always active (5 volts mod) so that reception from 18,300 to 18,800 is possible."
     
  5. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    A "splitter" is a Wilkinson power divider, NOT a directional coupler.

    19.2º east isn't visible from the US
     
  6. tdbone1

    tdbone1 Member

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    told and showed you alot more then that.
    google the info i just gave you and see if it shows up on a google search.
    i know i have not came across that info with my readings.
    dont forget.
    i did say with the wires disconnected i tested each port one at a time


    also the important part of that other quote wasnt that 19.2 isnt visible from usa but that 5v could be sent to the Ka lnb by doing a "mod"
    "To make this active, a special DiseqC command must be sent, something our receivers can not do, some PC Sat cards do.
    But there is a manual to change internally so that the BBC is always active (5 volts mod) so that reception from 18,300 to 18,800 is possible."
     
    Last edited: Feb 18, 2019
  7. tdbone1

    tdbone1 Member

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    so are you saying that i should use a splitter and not a DC Blocking directional coupler over a "splitter"?
    a splitter passes volts to my sdr wont it?
     
  8. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    It hasn't been clear what you're doing, so I can't "suggest" what you should do.

    I can only sit on the sidelines and hopefully point you.

    Splitters have both DC blocked & passing ports.

    You should REALLY measure things.

    The BBC was needed because the tuner chip can't receive 250-750 MHz.
    Your SDR can, so Ka [hi/low] will be "visible" and you don't need a BBC.
     
  9. tdbone1

    tdbone1 Member

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    getting ready to do more testing soon.
    just want to add this picture from that translated google link i shared above.
    [​IMG]
     
  10. slice1900

    slice1900 Well-Known Member

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    Wow, that's not very well translated. Those aren't "ports", those are feedhorns.

    BTW, with your SDR you have no need for the SUP-2400 since it can access the full 250 - 2150 MHz range that the LNB outputs. The reason the SUP-2400 B-band converter exists is because the tuner in most receivers can only tune a range of 950 - 2150 MHz, so they needed a way to access the 250 - 750 MHz range the tuner could not access by "moving" it into the range it can access. You don't have that limitation with your SDR, thus you can forget about the SUP-2400 as irrelevant.

    All you need to do is have a way to select voltage 13v/18v and tone 0/22 KHz, which the SWM16 provides for you. A splitter with one "output" connected to the desired input on the SWM16 (depending on what voltage/tone you want) and the other output connected to your SDR, and the input connected to your LNB will do the trick. That's all you need. No receiver needed either (if you think you need one, tell me what you think it is supposed to do for you)
     
  11. dreadlk

    dreadlk Hall Of Fame

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    If he puts a splitter between the receiver and the SWM he can use the receiver to change which one of the LNB ports he is looking at without constantly pulling off the cables.

    He needs to just connect the power pass port of the two way splitter into one of the 7 non power pass ports on the 8 way SWM splitter.

    The power input side of the two way goes to the receivers SWM port and lastly the remaining non power passing port on the two way goes to the SDR.

    Now when the receiver is in sat signal mode you can see the satellite transponders on that sat.
     
  12. James Long

    James Long Ready for Uplink! Staff Member Super Moderator DBSTalk Club

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    Not my project ... And I don't need to make the solution more difficult than it already is.

    Simple solution:
    Put a standard satellite splitter (1 to 2) on the each feed between the LNBF assembly and the SWM16.
    Connect the power pass port to the SWM16 and the common port to the LNBF.
    Move your SDR to the non-power pass port on each feed to scan each band.
    With the above setup you would not need a receiver as long as the SWM16 is powered.

    If you do not have four power pass splitters put one on the feed you want to test.

    If you try to use a SWM receiver to control the SWM16 you will only get the transponders requested by the receiver, not the entire band for each satellite position.
     
  13. slice1900

    slice1900 Well-Known Member

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    I'm assuming he isn't going to need/want to change voltage/tone all that often, so using the receiver seems like overkill (and would mean he bought the SWM16 for no reason)

    Changing what he's viewing in the satellite setup screen is a manual process just like swapping cables, unless he adds some sort of hardware that outputs IR in response to automated commands from a computer.
     
  14. tdbone1

    tdbone1 Member

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    thanks for all the great info from everyone.
    here is what i have so far.
    [​IMG]
    at the bottom of the fft is with power inserter off.
    the dish isnt pointing at anything so the picture is useless.
    going to go looking for:
    13v 22khz (sat 110 and 119) i think these are on the sl5k and not the sl3k
    i might need to move my signal wire over?
    anything i need to do just let me know.
    i have a 15db attenuator on the sdr Rx and a 50ohm terminator on the Tx.
     
    Last edited: Feb 18, 2019
  15. P Smith

    P Smith Mr. FixAnything

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    please don't ignore our posts above !
    seems to me you are not reading them :(

    it was detailed a couple times HOW-TO get signals from ALL Ku/Ka bands
     
  16. dreadlk

    dreadlk Hall Of Fame

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    Interesting, I have never played around with the SWM on an SSA. I only recently switched from a wb68.
    I would have thought the SWM would just serve up the sat and polarity selected and let the receiver tune to the IF freq that it needed.

    If it works the way your saying it makes it harder to see the full spectrum but easier to know what transponder your working with.
     
  17. P Smith

    P Smith Mr. FixAnything

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    Yes, hence SWiM [ aka FTD] invention.
    On your second thought … I'm totally puzzled how you will define particular tpn looking at SSA screen ?! It's not a submarine with known acoustical profile for each one. ;)
     
  18. tdbone1

    tdbone1 Member

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    im not trying to ignore any posts.
    just trying and thinking of to many things at once.
    going to re-read now.
     
  19. dreadlk

    dreadlk Hall Of Fame

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    Not by the SSA but by looking at what Tp I have the receivers signal meter set to display. So if I am on 101 tp 31 that is what should be displayed on the SSA right.
     
  20. P Smith

    P Smith Mr. FixAnything

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    well... yes and no; there are many [up to 22 !] tpns in that range;
    now it's a mix of sat/tpns in a set SWiM channels

    If you put vector analyzer onto 2 MHz FSK control channel with custom [DTV] decoder of commands, you will know which SWiM port carry particular sat/tpn pair
     

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