First Look: SWM-13 LNB

Discussion in 'DIRECTV General Discussion' started by Scott Kocourek, Sep 4, 2014.

  1. slice1900

    slice1900 Well-Known Member

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    He was talking about the 23ma current draw, not the 21v, which would add up to about 0.45 watts. I read that as 230ma for some reason thinking it was about 4.5 watts and might be the LNB draw only. But clearly it was an invalid measurement.
     
  2. P Smith

    P Smith Mr. FixAnything

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    I've not seen LNBF consuming less 150 mA.
     
  3. Stuart Sweet

    Stuart Sweet The Shadow Knows!

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    Then you haven't seen this one, apparently.
     
  4. slice1900

    slice1900 Well-Known Member

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    I didn't think there was much improvement possible in the LNB portion, because the power draw is for the amplifiers. Are you saying the entire LNB + DSWM draws at or less than 150ma - i.e. 3 watts at 21v? That would imply some major changes in the LNB itself, even if it had a magic DSWM chip that required 0 watts :)
     
  5. carl6

    carl6 Moderator Staff Member DBSTalk Club

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    My first measurement was with a metering device (similar to a DMM) which measures voltage, current, wattage, etc., inline with the DC draw. It will measure to 0.1 amp, anywhere from 1 to 60VDC. It showed no DC current draw (amps or watts), however the LNB was powered and I was watching a picture from an HR34 while doing that measurement.

    My second measurement was with the Accutrac because I didn't get a measurement with the first meter. The Accutrac reflected very low current flow, but the SWM signal was not passing as I wasn't getting signal to the HR34 with the Accutrac inline.

    At your suggestion, I placed kilowatt meter in the AC feed to the 21V PI, and it is showing 9 watts AC power draw at 120VAC. Disconnecting the LNB, the PI showed 0 watts draw. With LNB connected and the line to STBs disconnected, it showed 8.9 watts. When I reconnected the STB line, it momentarily dropped to 7.8 watts, then immediately returned to 9 watts. I did the latter twice, and it behaved the same both times, dropping briefly to 7.9 watts, then returning to 9 watts upon connecting the STB line.

    I don't have the ability to do any other measurements.
     
  6. P Smith

    P Smith Mr. FixAnything

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    Thank for the measures,so roughly we see the current is 0.5 A (9/21). Pretty close to typical figures 400...450 mA.
     
  7. nsykes

    nsykes Cool Member

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    So forgive my ignorance but I just want to confirm something. I could go straight off of the SWM-13, inside the house to a 4 split like the one pictured. ImageUploadedByDBSTalk1410932739.787393.jpg Power inserter plugged into the red output, my Genie HR34 off of 1 output and my HR24 off another and still have one left over for future use? If so they are making things insanely easy now! ImageUploadedByDBSTalk1410932739.787393.jpg


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  8. HoTat2

    HoTat2 Hall Of Fame

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    Correct ...
     
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  9. HoTat2

    HoTat2 Hall Of Fame

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    Just wonder what's preventing carl6's instruments from really registering any DC current?
     
  10. HDTVFreak07

    HDTVFreak07 Icon

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    I wish it's available right NOW. Could use one for my cottage. Signed up for mover's plan, expecting to have all my receivers connected here but idiot's work order included only the Genie, HR24 and one H25, not the rest I have. Apparently DirecTV assumed that that's all I'll have here and the rest remains home (main house 15 miles away) for whenever I go home. I even told them that I'm bringing all receivers here because I live here full time for the summer (or 6 months). No point now since I only got what, two months remaining living here before I close this place up for the winter.
     
  11. palmgrower

    palmgrower AllStar

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    When will it be available for sale?
     
  12. HoTat2

    HoTat2 Hall Of Fame

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    Unknown so far;

    Its going to be the usual routine of installations in only a few test markets first before a national roll-out to new customer installations or for release to retailers for sale to existing ones.

    Like other ODU related equipment Directv will not sell it directly.

    Wonder if the test markets will be those under RB-2A's spotbeams from 103 of Seattle, WA., El Paso, TX., SLC, UT., and Alaska? Then we would know for sure it was RDBS capable? :)
     
  13. slice1900

    slice1900 Well-Known Member

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    Thanks for the measurements!

    I wish I knew the power draw of the DSWM13 switch, as that would allow determining for sure if the SWM 13 LNB uses the EN5500. However, based on that rather modest draw you measure I think it is very likely it is. If it uses the EN5500, I think it is nearly 100% certain it can receive RDBS.

    Here's another question for those "early adopters". Did anyone conduct their testing using two dishes, one with the old legacy or SWM LNB, another with the new SWM 13 LNB for a side by side comparison? I'm curious if anyone noticed any difference at all in the onset of rain fade. I remember VOS posting at one time based on his experience in "high end" LNBs that Directv's LNB could have its resistance to rain fade improved somewhat with a better design (using log amps or VGAs IIRC) so I wonder if they made any "improvements" to the KaKuRDBS LNB that might have proven more cost effective today than when the original KaKu LNB was designed almost 10 years ago.
     
  14. carl6

    carl6 Moderator Staff Member DBSTalk Club

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    I replaced an SWM 5LNB with the SWM13. Prior to that I was using a legacy 5LNB with an SWM16 (all of which is still in place, just not in use at the moment). But I very rarely see rain fade, so I doubt I would be able to provide any kind of comparison.

    As to why I was not able to measure DC current with my first meter, I suspect it might have been because of the other signals on the line, and it might have thought it was not a DC draw. Just speculating, that meter isn't designed for in-circuit testing of something with rf on it, just pure and simple DC.
     
  15. palmgrower

    palmgrower AllStar

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    Being in South Florida, the rain fade this year has been a little worse, if it does reduce rain fade at all I'm purchasing one upon release


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  16. HoTat2

    HoTat2 Hall Of Fame

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    Nah ... it won't


    .
    Rain fades are deep chasms in received signals strength.

    And just having an LNBF that uses digital filtering techniques to reduce the SWiM carrier spacing so as to fit more channels in a given cable bandwidth does noting to help RF.
     
  17. palmgrower

    palmgrower AllStar

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    Shucks
     
  18. P Smith

    P Smith Mr. FixAnything

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    just install 2m dish, it will help reduce rain fade
     
  19. slice1900

    slice1900 Well-Known Member

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    If all it is is the same exact LNB design as before with different SWM technology, yes. But if they made other changes/improvements when they added RDBS support, it may help with rain fade. Certainly won't make rain fade go away, but it might raise the threshold somewhat for where rain fade hits. That's why I asked if anyone had run both side by side to see if it made any difference.
     
  20. palmgrower

    palmgrower AllStar

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    You have my attention, I disassembled and sold my 14' Paraclipse Islander , which 2 meter do you speak of?


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