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Ethernet over VHF

Discussion in 'Electronic Design' started by ok, Feb 26, 2007.

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  1. ok

    ok Guest


    I need to setup up a remote link using VHF for ethernet network.
    Frequency license is obtained already for a specific frequency within
    range of 130MHz - 180MHz . Can some one advice on possible solution
    with links to industry approved devices/products.


  2. John Barrett

    John Barrett Guest


    google VHF DATA RADIO, the TNC-X packet modem (or any other 1200 baud packet
    modem, there are several.. TNC-X is just the cheapest), and the "AGW Packet
    engine" for your ethernet to VHF bridge -- that will get you 1200 baud off
    the shelf with minimal construction issues -- (installing antennas,
    configuring radio, connecting packet modem, installing and configuring AGW)

    if you need higher data rates, then I need to know how much bandwidth your
    license allows you to use, and it will probably NOT be an off the shelf
    solution !!

    There is, to the best of my knowlege, NOTHING as an all-in-one package for
    tcp/ip over VHF -- you are going to have to piece the parts together one way
    or another !!
  3. PeterD

    PeterD Guest

    What are the technical specs of the license: Frequency, center
    frequency, bandwidth, modulation type, etc.
  4. Tam/WB2TT

    Tam/WB2TT Guest

    The use of these frequencies would be illegal in most of the world; so, I
    doubt that any commercial equipment exists. Why not use WiFi? It is cheap.

  5. Joel Kolstad

    Joel Kolstad Guest

    Probably true. Note that -- at least in the U.S. -- that is a standard
    military band, so there probably is plenty of military gear available... with
    the typical military price tag as well, of course.
  6. Tam/WB2TT

    Tam/WB2TT Guest

    He says ethernet; so, I assume he wants to go somewhere between 10 and 100
    Mb/s. Probably ~50 Mb/s, to be consistent with the 50 MHz bandwidth. He
    can't go below 137, which is the top of the civil aircraft band. 144 - 148
    is no good, that's a ham band. There is police and fire around 150 - 160,
    and TV starts at 174.

  7. Joel Kolstad

    Joel Kolstad Guest

    I'm hoping it is close to 10Mbps, or what he really means is just that he
    needs something with an Ethernet interface but the actual data rate can be
    more like 1Mbps. Trying to squeeze 50Mbps into the VHF band is just asking
    for interference complaints from everyone. As you point out, the military's
    138-174MHz chunk has various "holes" in it anyway, and while fancy radios
    these days can avoid those areas, it still takes plenty of effort and he
    clearly needs to give us some more information on his design.
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