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

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

  1. Feb 7, 2019 #81 of 259
    dreadlk

    dreadlk Hall Of Fame

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    Yes, you can get it cheap on eBay.
    Once you do that the rest will fall in place very easily. BTW what do you mean by alignment mode?
     
  2. Feb 8, 2019 #82 of 259
    tdbone1

    tdbone1 Member

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    "alignment mode" = no IRD devices connected. i think its for connecting a signal meter like the "AIM".
     
  3. Feb 8, 2019 #83 of 259
    dreadlk

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    Ok thanks. I could just hook my AIM meter up to scope and see what it is putting out. Maybe more useful would be to put a splitter between it and the SWM and see what shows up on the spectrum analyzer. Of course I would first need to get a picture catalog of each transponder on 101 in order to see which one it matches.

    It may seem strange but I have never used the step by step alignment mode on the AIM. I always just look at the weakest transponder on 101 and align from there and then go back to ones on 99 and 103 that are the lowest and tweak a bit from there also. It takes more time but I get a better average signal than what the installers will get.
     
  4. Feb 8, 2019 #84 of 259
    slice1900

    slice1900 Well-Known Member

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    A picture catalog of each transponder on 101? They aren't going to look any different, you can't pick them out of a lineup like a bank robber!
     
  5. Feb 9, 2019 #85 of 259
    P Smith

    P Smith Mr. FixAnything

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    There are different in level and slightly in shapes, but be aware of constant changing in time.
     
  6. Feb 9, 2019 #86 of 259
    dreadlk

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    Yes as P Smith said on a Spectrum Analyzer they will all have slightly different power levels and shapes. So long as you use the same setup for the Catalog of pictures and the actual test you will be able to see which one it is using. The question is does the result really have any purpose.
     
  7. Feb 9, 2019 #87 of 259
    P Smith

    P Smith Mr. FixAnything

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    Little bit.
    Perhaps you will first who'll reveal what is the mode do in reality of RF domain...
     
  8. Feb 9, 2019 #88 of 259
    James Long

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

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    Why not tune the satellite card to each SWiM channel and see what transponder is identified?
    Or is this information encrypted? (Unlike DISH's transponders where only content is encrypted.)
     
  9. Feb 9, 2019 #89 of 259
    Delroy E Walleye

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    Well, I for one could be very interested -- If results will yield info on being able to block firmware updates while keeping receiver/whole-home authorization active on the HR44!
     
  10. Feb 10, 2019 #90 of 259
    P Smith

    P Smith Mr. FixAnything

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    No. There are on each Ku tpns a "beacon" - PID (0x810 or 820 ?) what carry provider/tpn IDs.
     
  11. Feb 10, 2019 #91 of 259
    P Smith

    P Smith Mr. FixAnything

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    Dream off !
    To stop DL of pushing FW you will need to kill [filter out] certain PID, not whole tpn ! That's a task for FW , not SWiM device.
     
  12. Feb 10, 2019 #92 of 259
    slice1900

    slice1900 Well-Known Member

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    Depends on if there is anything else on the transponders carrying the firmware that you need. Since it uses a different transponder than the one that is the SWM guide channel, at least blocking those after the receiver is up and running (in case it needs those during startup) would not interrupt the guide. You'd lose some MPEG2 SD channels, but you can probably live with that.

    The unknown is whether the firmware is also delivered over Ka transponders that we can't see. If it is, even if you blocked the transponders on 101 that deliver firmware you wouldn't block the updates.

    You'd need some notch filters at the precise frequency of the four transponders known to carry the firmware installed on the 99/101 even and 99/101 odd lines coming from a legacy dish, between the LNB and SWM switch - and might need to temporarily disconnect them when you wanted to restart the receivers. They don't sell filters like that off the shelf, so you'd need to order them custom. Seems like a lot of effort and expense in the hope you'd block firmware updates without breaking something else!
     
  13. Feb 10, 2019 #93 of 259
    P Smith

    P Smith Mr. FixAnything

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    1st - no FW on Ka tpn
    2nd - FW PIDs interleaved with APG PIDs on same Ku tpns and many channels carry on same tpn - just compare Gary's ch map and redH tpns
    3rd - it's very weird proposal - it would have no real outcome, just a verbal exercise :)
     
  14. Feb 10, 2019 #94 of 259
    dreadlk

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    Yep most of these things can be done but it’s not easy and they have no real benefit except for gaining knowledge. I am all for knowledge but only if I can do something with it. Stopping updates may be a bad idea as you would miss out on any fixes
     
  15. Feb 10, 2019 #95 of 259
    James Long

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

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    My interest would be just to see how it was done. It would need to be on an active system with DIRECTV receivers. I could see tapping a SWM output then using a FTA card to discover which satellite transponder was on each SWM channel at a particular time and watch the satellite transponders change as the channels change. If the FSK conversation could be monitored one might be able to figure out how the receivers ask the switch for a specific transponder. Possibly how SWM channels are assigned to each receiver. All irrelevant to most people (turn on the receiver and the system does all of the work for you). But knowledge is interesting.

    If there is a "power up default" on a SL3S one should be able to see it with an FTA card and identify what transponders are on what SWM channels using the beacon PID. If I understand correctly, the AIM meter can speak SWM so it may be commanding what transponders it wants on what SWM channels and not using a default. Connecting a plain FTA card would give a better idea of what would be default outputs. All irrelevant for most people but interesting to a few.
     
  16. Feb 10, 2019 #96 of 259
    P Smith

    P Smith Mr. FixAnything

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    One minute, just give some time to find at least ONE DSS feed here :D
     
  17. Feb 10, 2019 #97 of 259
    tdbone1

    tdbone1 Member

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    since i can receive the 2.3MHz signal i might be able to Tx at 2.3MHz also.
    i not sure how my Tx out of my sdr device would be wired into the PI21v to (IRD) which is my limesdr-mini.
    where would the limesdr-mini Tx output tie into the SWiM?

    at the 40 second mark is when i plug the PI21 into wall outlet giving it power
     
    Last edited: Feb 10, 2019
  18. Feb 10, 2019 #98 of 259
    P Smith

    P Smith Mr. FixAnything

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    A couple notes:
    - without IRD or a SWiM controller, you'll see nothing at 2.3 MHz
    - try to find (or develop by yourself) FSK demodulator

    After that, we will continue ;)
     
  19. Feb 10, 2019 #99 of 259
    tdbone1

    tdbone1 Member

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    is there a "Recommended" Receiver or SWiM controller" i can get that will have an extra output port to link to my sdr device?
    Or do i just need to get a hardware directional coupler....bi-directional?...
    im not an expert more just of a hobbiest.
     
  20. P Smith

    P Smith Mr. FixAnything

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    yeah, take any IRD what support SWiM, say - cheap H20;
    " SWiM controller" would be build after you'll finish your research and open crowdfunding for that (Raspberry PI is good candidate, perhaps new Arduino FSK module too)
     

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