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satellite dishes

Discussion in 'Misc Electronics' started by Allan Adler, Aug 20, 2004.

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  1. Allan Adler

    Allan Adler Guest

    I'd like to read about satellite dishes as devices in their own right,
    rather than from the standpoint of their applications. In other words,
    their design, construction, circuitry (simple as it probably is),
    characteristics and anything else you might want to know before
    connecting them to a circuit. I've been searching on the web and
    basically what I find are sites that will sell or lend you a satellite
    dish for some application, or which will advise you on how to select
    one for that purposes. I don't find sites that simply talk about what
    it is in all detail and what you can get away with in building or using
    one. If there is a book devoted to this, I'd like to know about it,
    but maybe that's like asking for a book on what a resistor is.

    I think that a satellite dish is basically a certain kind of antenna
    with some additional circuitry that one doesn't find in other antennas
    and maybe also some mechanical features such as motors to control its
    orientation. I don't know if all of that would be adequately described
    in a book on antennas.
     
  2. Bob Myers

    Bob Myers Guest

    Yes, it's basically an antenna with a built-in amplifier, in
    most cases. The reflector is either parabolic or spherical
    (both should be discussed in any decent book covering
    antennas for UHF and above), and that reflector directs
    signals to one of several possibilities at its focus. Whatever
    picks up the signal there (for really high frequency stuff,
    often a horn feeding into a waveguide), it generally
    winds up going through an "LNA" (low-noise amplifier,
    or sometimes referred to as an "LNB," low-noise
    buffer) for amplification before being stuffed into the cable
    to be sent to the receiver. In some more elaborate systems
    at the really high frquencies, the signal may be downconverted
    at the antenna, so what winds up on the cable isn't the same
    frequency stuff as what comes into the reflector in the first
    place.

    Bob M.
    Boston.
     
  3. Ken Taylor

    Ken Taylor Guest

    The dish is just a dish antenna; the system is 'different'. Anyway,
    semantics aside, a good reference book wood be Satellite Communications by
    Roddy
    (http://www.amazon.com/exec/obidos/ASIN/0071371761/qid=1093208094/sr=ka-1/re
    f=pd_ka_1/103-5465902-3310269)
    If you just want to surf for the moment, have you seen this page:
    http://www.ee.surrey.ac.uk/Personal/L.Wood/constellations/

    Ken
     
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