I'm waiting for BT....

Discussion in 'Broadband' started by Davey, Oct 15, 2015.

  1. Davey

    Martin Brown Guest

    I'm not sure the market is all that large. Units are available but at
    commercial rather than domestic user price points.
    Yagi is the tool of choice for cheap effective direction antennas.
    That is largely irrelevant in the areas where this is being considered -
    there is only one 3G capable node within range!
    ISTR the best omnidirectional antennae manage about +6dB or so - parhaps
    a bit more if you can get them nice and high.
     
    Martin Brown, Oct 20, 2015
    #41
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  2. Davey

    Chronos Guest

    The ability to selectively direct the signal to a known BTS or null
    out a problem BTS can be very useful in marginal areas, too. You don't
    want two cells fighting over you if you're actually using the signal for
    something.

    Yagis are a bit fiddly, though, and gain isn't everything. You've a lot
    of buggering about with matching to do and you're stuck essentially on
    one band, whereas a LPD has reasonable F-B at the higher frequencies
    and it's pretty much matched right across the broadband range by just
    connecting the (short) feeder to the end of the transmission line boom.

    They're a bit easier to make, too. Bit of double sided PCB and a Dalo
    pen at its simplest.

    http://www.changpuak.ch/electronics/lpda.php A boomlength of 300mm
    for 800-2600MHz will give you a pretty usable 7dBi (~4.7dBd as a dipole
    has 2.3dB over an isotropic radiator - "gain" is just concentration of
    the available signal). More importantly, it should fit on a piece of
    PCB. 200mm gives you an 8 element array with a gain of ~6dBi. Shorter
    than that isn't really possible as the tau drops below 0.76.
     
    Chronos, Oct 20, 2015
    #42
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  3. Davey

    Martin Brown Guest

    Possibly helpful. I have a pair of yagis and a MIMO Mifi with two SL9
    connectors and I intend to try it out in the hope that it will work
    measurably better than a single antenna. Chopping the top off a local
    hill would be an even better solution but not very realistic.
    Might be an issue if the low band 4G ever appeared on local masts but
    TBH I expect hell to freeze over first.
    Interesting site. Thanks.
     
    Martin Brown, Oct 20, 2015
    #43
  4. Davey

    Woody Guest


    Do O2, VF or 3 have any option with 4G? I know O2 have given up some
    of their 900MHz 2G channels for 4G but they are still 900MHz - and I
    expect VF will be doing the same. 3 only use the 3G band and as such
    cannot run 4G there, so unless they go to the 2600MHz range with its
    attendant problems (not least that few if any phones have that
    capability) they will have no option but to use 800MHz.
     
    Woody, Oct 20, 2015
    #44
  5. Davey

    Chronos Guest

    Try to aim your yagi at the very top of that hill. At these frequencies
    it probably won't help but there's a slight chance you'll get a bit of
    "knife-edge" and it'll refract some of the signal back down. You may
    have to do a bit of tweaking to the alignment if it does make a
    difference to get the best signal and it's *very* minute adjustments.
     
    Chronos, Oct 20, 2015
    #45
  6. You could hire this lot. Blew the top off a mountain to build their
    telescope.

    http://www.theguardian.com/science/across-the-
    universe/2014/jun/19/mountain-top-chile-european-extremely-large-
    telescope

    or http://tinyurl.com/o7kckqs

    :)
     
    Mike Tomlinson, Oct 20, 2015
    #46
  7. FTTC in some areas. Just not our cabinet - even though they've installed it.
    Oh, I actually get over 4. The other end of the village gets less than 1.

    Connecting Cambridgeshire. As usual it says we'll get it by the end of
    the year. Only the year changes :(

    And we also have this:

    <http://www.lucyfrazer.org.uk/news/lucy-frazer-host-open-meeting-broadband>

    I bet she doesn't solve it, as she says she will!

    Andy
     
    Vir Campestris, Oct 20, 2015
    #47
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