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Strange 99/103 problem

Discussion in 'DIRECTV Installation/MDU Discussion' started by jal, Jul 10, 2010.

  1. jal

    jal Icon

    761
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    Mar 3, 2005
    Last week, Directv came out and realigned my dish. It's a Slimline 5 lnb, connected to a WB616. I was having rain fade problems. The signals went from the 50s to the 80s-90s (on 99/103) by adjusing the scew. 101/110/119 were/are fine in the mid 90s. So, I thought my problems were resolved. However, it rained this week, and each time it rained, 99/103 would go out. Singal strength below 40. Yet, 101, 110, 119 remained in the high 70s low 80s during rain (mid 90s without rain) Any thoughts on why 99/103 is so impacted, while 101, 110, 119 seem more stable?
     
  2. eakes

    eakes Godfather

    354
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    Sep 21, 2007
    They work at different RF frequencies. 101, 110 and 119 satellites operate in the 12 Ghz band, 99 and 103 are in the 18 Ghz band. Both are prime candidates for rain fade but higher frequencies (shorter wavelength) suffer more from rain fade, hence 99 and 103 can go 'out' while there remains a watchable signal on the other satellites.

    Bottom line is, that until some basic Laws of Physics are repealed, there will be rain fade at 12 and 18 Ghz (and other frequencies also, but those are ones of concern to satellite viewers).

    Properly aligning the antenna will help, but it will not completely eliminate the 'problem'.
     
  3. jal

    jal Icon

    761
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    Mar 3, 2005
    Thank you for this explanation. This makes sense. I wonder, would the 3lnb dish that just receives 101/103/99 be less impacted by rain fade?
     
  4. harsh

    harsh Beware the Attack Basset

    21,192
    183
    Jun 14, 2003
    Salem, OR
    Quickly to the point, Ka band (99W, 103W) is a much higher (50%) frequency than the other slots (Ku band) so it is impacted the most by weather.
     
  5. harsh

    harsh Beware the Attack Basset

    21,192
    183
    Jun 14, 2003
    Salem, OR
    It is the same dish. The impact is the same.
     
  6. jal

    jal Icon

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    Mar 3, 2005
    Thank you. What is the highest signal on 99/103 one could reasonably expect in Northern Ohio on a clear day?
     
  7. prospect60

    prospect60 Legend

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    Aug 26, 2006
    On 99c, 103ca, and 103cb I'd say mid 90's aren't unreasonable and low 90's are to be expected on the majority of transponders
     
  8. texasbrit

    texasbrit Well-Known Member

    5,213
    106
    Aug 9, 2006
    Very high 80s to mid-90s on all transponders on 99c/103ca/103cb.....
     

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