Duel Output Lnb?

Discussion in 'Satellite TV, Sky TV & FreeSat' started by patmyhead, Feb 20, 2005.

  1. patmyhead

    patmyhead
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    HI
    Is there a lnb that will output both horizontal & vertical polarities at the same time :confused:
    i have just got a sat receiver with a hard drive :thumbsup: what i would like to do is just change my existing lnb to a duel output one to save having to run extra cables :smashin: as i have four dishes :eek: i would then be able to watch one prog & record another :D
    Pat
     
  2. Chris Muriel

    Chris Muriel
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    Yes there are actually 2 types of LNB that have 2 (F connector) outputs.

    They are called "dual" and "twin" LNBs. One has 2 totally independent outputs simultaneously.
    The other outputs V from one port and H from the other.
    Unfortunately sales sources can't seem to agree on which name applies to which - so check you have the right type before you buy.

    For 4-output types the names are "Quad LNB" (4 independent simultaneous outputs) and "Quattro LNB" - 4 outputs as follows :
    a) Lowband V
    b) Lowband H
    c) Hiband V
    d) Hiband H

    Chris Muriel, Manchester
     
  3. patmyhead

    patmyhead
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    thanks Chris

    the lnb's you mention have two f connectors needing two cables
    what i am after is a lnb with only one f connector output that will carry both polarities down one cable & letting me use both vertical & horizontal polarities at the same time if that makes sense

    Pat
     
  4. Chris Muriel

    Chris Muriel
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    That has to be impossible.

    V & H require different DC voltages to be sent down the coaxial cable.
    You cannot have 14 V and 18 volts at the same time !
    A "DC diplexer" is physcially impossible ; it would be classified in the same bracket as a DC-transformer or an AC battery :)

    You can perhaps install a tone controlled or DiSeQc switch to switch a single cable between the 2 outputs of a dual LNB - but you can't receive both simultaneously.
    The Satcure website has good info on all these sorts of basic questions.

    Chris Muriel, Manchester.
     
  5. patmyhead

    patmyhead
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    thanks again Chris :thumbsup:

    looks like i will have to get 4 twin lnb's & loads of new cable :eek:

    i use a 4 to 1 DiSeQc switch at present but this only gives one polarity at a time
    Pat
     

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