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SWM-16 Overheating

Discussion in 'DIRECTV Connected Home' started by dondude32, Jun 19, 2010.

  1. LameLefty

    LameLefty I used to be a rocket scientist

    12,182
    105
    Sep 28, 2006
    Middle...
    Check a physics textbook or google for "black body radiation." :)
     
  2. dondude32

    dondude32 Legend

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    Apr 3, 2003
    Alright alright I'll paint the thing black. Just kidding. Couldn't help myself after all the chatter on black heat sinks. Lol. Plus thanks to whomever corrected my spelling error in the post subject. Cringed every time I saw it.
     
  3. br408408

    br408408 Legend

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    Jun 1, 2008
    Thanks, by googling "black body radiation" I found this http://en.wikipedia.org/wiki/Thermal_radiation

    The following pertains to the Acrylic based white paint like I used.

    "If objects appear white (reflective in the visual spectrum), they are not necessarily equally reflective (and thus non-emissive) in the thermal infrared; e. g. most household radiators are painted white despite the fact that they have to be good thermal radiators. Acrylic and urethane based white paints have 93% blackbody radiation efficiency at room temperature (meaning the term "black body" does not always correspond to the visually perceived color of an object). These materials that do not follow the "black color = high emissivity/absorptivity" caveat will most likely have functional spectral emissivity/absorptivity dependence."

    Although I did not know this at the time that I painted it white (maybe I just blundered into something), I checked to see how hot it was running with my hand at the time I painted it, and it seemed only warm. I checked it's temperature today while it was in the shade.

    Ambient air temp = 93.3

    SWM-8 temp with an HVAC digital thermometer = 99.4,

    SWM-8 tempwith an infrared thermometer = 99.6

    Today, I mounted an unpainted (still gray), unpowered spare SWM-8 (I keep a spare SWM and a spare LNB on hand...GF can't live without TV :) ) right next it the white paint one in use. Tomorrow, I will report of the temp of both when they are in the sun.
     
  4. dennisj00

    dennisj00 Hall Of Fame

    9,688
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    Sep 27, 2007
    Lake Norman, NC
    And only THREE channels. . . you had to turn a dial on the front!!

    That's why I sat close to the TV.
     
  5. ndole

    ndole Problem Solver

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    Aug 26, 2009
    Just a possability.. but sometimes, rarely, you can have outdoor connectors that were prepped too shallow, making the center barely make contact with the barrel/ground block/switch. These connectors will fail during extreme heating and cooling because the dielectric of the coax grows and shrinks within the cable, pushing and pulling the center conductor in and out of contact.
     

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