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Antenna question

Discussion in 'Electronic Basics' started by AssTelescope, Dec 19, 2004.

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  1. AssTelescope

    AssTelescope Guest

    The other day I posted a few pictures of this dish like antenna I took from
    my parents roof. If you live in Sydney you'll remember a service called
    Galaxy TV. Thats the cheap ass dish!

    Ive read from the reply posts (thanks) its only good for UHF and picking up
    distant radio stations.

    Does the quality of metal affect the signals that you can pick up or
    something else? There's something about it that makes me think It could be
    used to do something more, VHF, other bands, raw satellite video? Is there
    equipment I can buy to make it more useful?

    Very bored here and need to do something with this piece of junk.
    ta
     
  2. Rich Grise

    Rich Grise Guest

    You're probably out of luck. From the pictures I saw, the thing in the
    middle looks very much like a microwave feedhorn. Yes, it's a cheap dish,
    but apparently able to pick up satellite broadcasts. But it's probably in
    the range of 3000 MHz, which is way, way above the UHF broadcast band. You
    could theoretically pick up satellite signals, or for that matter, radars
    from nearby airports, but the rest of the crap you'd need to make any
    sense of it isn't worth the amount of money you'd have to spend.

    Sorry. )-;
    Rich
     
  3. Active8

    Active8 Guest

    UHF: 300 MHz - 3 GHz

    New band every octave. ELF VLF LF MF HF VHF
     
  4. Active8

    Active8 Guest

    It should be conductive. Any mesh should be <= 1/12 to 1/20 *
    wavelength sized "holes".
    I can't find the picture but with a suitable feed situated at the
    focal point you can estimate the gain you might achieve with

    2 pi A
    ---------
    lambda^2

    roughly, at 50% efficiency.

    A = Area

    lambda = wavelength.
     
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