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circular lnb to linear lnb convert

Discussion in 'Free To Air (FTA) Discussion' started by jenom, Jun 12, 2011.

  1. jenom

    jenom Thread Starter Member

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    I got this rarely seen lnb, round shape, ku band circular single lnb, lo=10.750 Ghz, Input=11.70-12.75 Ghz, NF=0.5 dB

    seems like the frequency (11.70-) is fine for fta, however the circular polarization is a problem
    thinking of taking off the front cap and removing inside the plates to make it linear
    would this work ?
    thanks !
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  2. Mikey11

    Mikey11 Active SatelliteGuys Member

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    That lnb is made for "eye-patchers" to get 118w and 119w on the same lnb....not sure if its possible to get linear TPs with it....
  3. Iceberg

    Iceberg We're here....RUN!!!! Supporting Founder

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  4. Anole

    Anole SatelliteGuys Guru

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    High production circular LNBFs have a little fin inside the feed tube to make 'em work on circular.
    It's cast into the metal.
    If your unit is made with that technology (instead of the teflon plate), then you'd have to remove the metal with a hand grinder.

    So, agreeing with Iceberg, I wouldn't pay real money for one.
    Of course, if you found one for free, by all means take a look. ;)
  5. jenom

    jenom Thread Starter Member

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    circular lnb to linear convert

    removed white front plastic cap (with a help of heat gun)

    inside is a white piece of plastic , placed in a 45 degree angle
    on both end , a wide "V" shaped cut out, almost as wide as the plastic

    removed plastic piece

    behind at 3 o'clock there is a round metal pin goes horizontally until halfway
    further in, at 6 o' clock there is another round metal pin vertically up about 1/3
    above it, a larger diameter horizontal pin goes all the way across between the metal walls

    I am going to try it out with plastic piece removed, point it to the strong 101w and see what happens .....it was free, nothing to loose
  6. rv1pop

    rv1pop SatelliteGuys Family Pub Member / Supporter

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    That should do it
  7. jenom

    jenom Thread Starter Member

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    did a quick test run on a 18" oval starchoice plastic dish in a light drizzle
    got 101w History with 57%, 97w presstv 48%, 95w cctv-e 68%
    these readings are similar to any other "no name" linear lnbs I have
    this lnb is definately a keeper, time to put it to "non-evil" use
    thanks for all the replies

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