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Antennas

Discussion in 'Electronic Design' started by JosephKK, Jul 16, 2008.

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  1. JosephKK

    JosephKK Guest

    I have someone who wishes to specify a ferrite loopstick antenna for
    AM radio (530 kHz to 1710 kHz) and wants the following properties,
    omnidirectional, vertical polarization, and expects it to require
    serious lightning protection. I expect it might need some but the
    specifications read like a 1000 foot tower lighting specifications.
    How do i explain to the other "Engineer" that the specifications are
    not reasonable?
     
  2. The lightning protection is doable. Since the
    field is coupled magnetically, it can be placed
    in the vicinity of a lightning absorbing spike.

    The omni directional sensitivity is more of
    a problem. Physics dictates how the waves
    propagate

    Rene
     
  3. Phil Allison

    Phil Allison Guest

    "Rene Tschaggelar"

    ** I suspect " omni-directional " really only applies to the horizontal
    plane.

    Given that AM band transmitters are all earth bound.

    Martian spacecraft notwithstanding, of course.




    ...... Phil
     
  4. Joerg

    Joerg Guest


    In such a case you may have to carefully ease them back to the basics
    but without explicitly saying that. Maybe something along these lines:

    http://www.electronics-tutorials.com/antennas/antenna-basics.htm
     
  5. JosephKK

    JosephKK Guest

    Yes, loop antennas intrinsically have a lemniscate pattern (figure-8,
    two diametrical lobes and two deep notches). I had to dig up the word
    cause i could not remember it.
     
  6. JosephKK

    JosephKK Guest

    No words missing, it is a receive antenna for US AM Radio. 530-1710
    kHz.
     
  7. JosephKK

    JosephKK Guest

    Alas, i do not have newsgroup access at work. But i got back to this
    just as fast as i could find it. Oh, and thanks to all already.
     
  8. JosephKK

    JosephKK Guest

    I would really like it if they could become interested enough to learn
    it, it would really make my day.
     
  9. Joerg

    Joerg Guest

    Depends on who they are. For example, if it's folks with a vested and
    serious financial interest in the business I usually begin to explain
    the cost implications of such a spec. Kind of a cost benefit analysis.

    I truly hope it's not a bureaucrat you have to deal with because then
    this could be next to impossible.
     
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