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Antenna Q

Discussion in 'Electronic Basics' started by Rich Grise, May 20, 2004.

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  1. Rich Grise

    Rich Grise Guest

    So, I was thinking of something else, and thought, once again, about
    building a little Yagi for local UHF. A little googling turned up:

    http://members.shaw.ca/weskyscan/3ElementYagi.htm

    Which has the formula right there, which is cool, but I'm wondering,
    to what degree is this scalable, and what kind of parasitics do I
    have to account for? I'm looking at US UHF broadcast - the highest
    channel I usually look at is 58, but there's one at 56 which seems
    to come in pretty OK with a little random wire, but when I move it
    around for the best reception, as soon as I move my hand, it
    detunes it. :)

    Well, I live at a weld shop (actually, they do both - welding
    and machining) so can get practically unlimited quantities of
    aluminum or steel or alloy rods, from .040" up to about 3/16"
    diameter. So I could just cut a few pieces and tape them to
    a popsicle stick, and I'd have an antenna - but I still have
    to match it to the input of my battery TV, which expects a
    whip.

    Any suggestions on that, as to what kind of coil would match
    it well, and what I do with the other end of it? I do have
    access to chassis ground through the wall wart connector.
    - I just looked - it has a jack labeled "EXT.ANT." - looks
    like an ordinary 1/8" phone jack - whould I take a WAG that
    that one might be low impedance? (prob. 75) And how do you
    make a balun for 722 MHz?

    Thanks,
    Rich
     
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