>Alexandre, I've been with DirecTV for a few years. The LNAs switch
>between left and right circular polarization for odd and even
>transponders. The receiver provides the control voltage. The newer
>"Plus" systems that can receive satellites in another orbital `slot'
>using an eliptical dish, also add a tone activated switch to select LNAs.
>The Dish network is the same as far as polarization switching. A typical
>complaint is only receiving channels on odd or even transponders which
>indicates a bad LNA, the cable from the receiver to the LNA, or the
>receiver control voltage.

        Very interesting! Thank for improving my knowledge on this subject ;o)


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Alexandre Souza
taito@terra.com.br
http://planeta.terra.com.br/lazer/pinball/

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