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DIY KA Band LNB

  • 28-01-2012 11:08pm
    #1
    fkearney
    Registered Users, Registered Users 2 Posts: 54 ✭✭


    Hopefully commercial KA band LNB's will soon be available but if in the meantime you would like to get something that is functional and works on a standard dish with standard clamps you may want to try the following. Remove the waveguide and assembly from the hughes LNB. Make an adaptor plate as shown. Insert a feed assembly from an old LNB into the adaptor late. This should be centered over one of the input waveguide slots. Hot glue the assembly together. You should be able to eek out better performance with a teflon slab in the feed to do the circular to linear conversion. Works fine without though. There is a common theme to all the pictures I post, rain. Hence its always a good ides for a cover.I have some hughes LNB's that I will put up on adverts. They should be considered experimental.


Comments

  • #2
    watty
    Registered Users, Registered Users 2 Posts: 32,417 ✭✭✭✭watty


    Onwave are selling them now.
    Next week or month (feb 2012 or March at latest) everyone will be selling them.

    Teflon is for C-band. Ka-band you need the shaped waveguide.

    The Hughes LNBs are extremely "experimental/hobbist" and maybe in a fortnight pointless. The proper LNBF has hugely better performance.


  • #3
    fkearney
    Registered Users, Registered Users 2 Posts: 54 ✭✭fkearney


    Teflon works and was widely used for KU, I have used it myself upto 12.7Ghz. BSB and some of the Nordic Sats operated on circular polarisation. I would expect that shaped waveguide is used at KA because the short wavelenght makes it practical. It also has the added advantage in that it can simultaneously provide a solution for RHC and LHC transmissions.


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