AU9 Ka LNB Local Oscillator

Discussion in 'DIRECTV General Discussion' started by Doug S, Jul 17, 2008.

  1. Doug S

    Doug S Cool Member

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    Jun 2, 2008
    Anybody know where I can find the local oscillator frequencies for the Ku/Ka LNBs on the Slimline AU9 dish?
     
  2. bobnielsen

    bobnielsen Éminence grise

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    Bainbridge...
    :welcome_s to dbstalk!

    I haven't seen anything definitive, but based on the channel assignments shown on Lyngsat, the Ka local oscillator frequency is around 18050 MHz. For Ku, it is probably somewhere near 11250 MHz.
     
  3. P Smith

    P Smith Mr. FixAnything

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    Two of them - one for Ka-Lo, other for Ka-Hi.
     
  4. bobnielsen

    bobnielsen Éminence grise

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    Bainbridge...
    No, a common LO for both subbands (with two i.f. ranges, 250-750 and 1650-2150).
     
  5. P Smith

    P Smith Mr. FixAnything

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    I'd like to see your math.
     
  6. Doug S

    Doug S Cool Member

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    Jun 2, 2008
    Thankyou. I have a satellite meter that I can enter specific configuration settings (i.e. frequency, LO frequency, SR, FEC. LNB Volt, QPSK Mode, 22KHz). It won't allow me to enter Ka band frequencies or LO frequencies, but I'm thinking that if I know the transponder freq and the LNB LO freq and since the meter actually sees the difference between the two why can't I calculate that difference and then enter a configuration in the Ku band with a transponder freq and LO freq that has the same difference? As long as the other parameters are set correctly I should be able to measure the Ka signal. The meters input range is 950-2150MHz so Ka low won't work but Ka high should.-----------Any thoughts?--------
     
  7. P Smith

    P Smith Mr. FixAnything

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    Use BBC dongle and update FW on the sat meter to use it.
     
  8. bobnielsen

    bobnielsen Éminence grise

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    The Spaceway 1 and 2 satellites use Ka high but are strictly spotbeam, so you may only get a few transponders (and maybe none on one of the satellites).
     
  9. P Smith

    P Smith Mr. FixAnything

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    bob, I'm stiil waiting real proof of your assertion - the math.
     
  10. bobnielsen

    bobnielsen Éminence grise

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    Bainbridge...
    The frequencies shown on the Lyngsat website are within these ranges, but I am not sure of the exact band edges:

    Ka-low
    18300 - 18050 = 250
    18800 - 18050 = 750

    Ka-high
    19700 - 18050 = 1650
    20200 - 18050 = 2150

    I can't navigate to the details, but the index of Part 25 rules on the FCC web site shows the same band edges as I used above:

    25.138 Blanket Licensing provisions of GSO FSS Earth Stations in the 18.3-18.8 GHz (space-to-Earth), 19.7-20.2 GHz (space-to-Earth), 28.35-28.6 GHz (Earth-to-space), and 29.25-30.0 GHz (Earth-to-space) bands.
     
  11. P Smith

    P Smith Mr. FixAnything

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    Thanks.
     

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