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UHF + UHF Antenna Diplexer

Discussion in 'Electronic Design' started by Rodney Josey, Jan 17, 2005.

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  1. Rodney Josey

    Rodney Josey Guest

    If I've posted to the wrong NG for this then please advise...:)

    Does anyone know if there is such a thing as a 'diplexer' for combining two UHF antenna's each
    pointing in different directions into a single cable prior to being input into an antenna amplifier

    I have need of 2 x UHF antennas - main one facing north for 4 free-to-air channels & a secondary one
    facing to the south for a separate single free-to-air channel. Now I can get a 'diplexer' for
    combining a VHF antenna plus a UHF antenna into a single cable which on taking one apart shows that
    the VHF side stripline resistive load is different than that used on the UHF side - so NO GO for
    using such a 'diplexer' when I need to combine 2 x UHF cables together into the one cable feeding
    into the input of an external aerial amplifier.

    Any ideas on what I could do to get this ?

  2. Don Pearce

    Don Pearce Guest

    What you need is not a diplexer, which operates on different
    frequencies, but a simple UHF splitter, as you would use to feed a
    single antenna to two TVs. This will provide the function you need. A
    disadvantage is that by combinning antennas you lose most of the
    anti-interference advantages of the directional nature of antennas.

    Still worth a try, though.


    Pearce Consulting
  3. gwhite

    gwhite Guest

    A splitter would lose 3 dB of power on each leg (minus any interference
    effects). He seems to be saying these are different channels for the different
    directions. He needs a filter type combining system.
  4. Don Pearce

    Don Pearce Guest

    If he is trying to combine two similar frequencies, and unwilling to
    spend tens of thousands on a waveguide combiner, the it is certain he
    will have as much loss from a diplexer as from a splitter. Anyway,
    provided the signal is decent on both antenna, 3dB of loss is rarely a
    problem. I have a 1dB attenuator pad in my antenna cable.


    Pearce Consulting
  5. Don Pearce

    Don Pearce Guest

    Oops - make that 10dB.


    Pearce Consulting
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