The j-pole antenna is fixed...

Discussion in 'Amateur Radio News' started by KX4O, Jul 9, 2020.

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  1. KE4IKY

    KE4IKY Ham Member QRZ Page

    Hi... I appreciate the discussion of this, the aspect of how the combinations of normal ideas in a novel way, relates to it's patent-ability was thought provoking. I do have a question though. If the lower stud is tuned to decouple the antenna from the feed-line (which is also the mast based on diagrams of it) what exactly is the purpose of the upper stud. The tuning could be done just by properly measuring the distance from where the lower stub is connected, to the top of the antenna. Unless the upper stud is just used to shorten the antenna?

    Thanks
    Joel
     
  2. PA0MHS

    PA0MHS XML Subscriber QRZ Page

    The upper stud and a similar length of tube that ends up as radiator is an impedance transformer from 50Ohm to a very high impedance This feeds the upper 1/2 wave part of the antenna, the radiator, as an end-fed dipole.
     
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  3. K0DD

    K0DD Premium Subscriber QRZ Page

    Chip I do believe you missed the ultimate opportunity to hang around a bit, then take Ole' "Dean Yeager" out for lunch, at least three martinis worth. Make his millennia.
     
  4. W1YW

    W1YW Ham Member QRZ Page

    You mean 'Dean Wormer'? :)?

    https://www.bing.com/videos/search?...4DAC6714042A0C7DA8E74DAC6714042A0&FORM=VDQVAP

    Although I am sympathetic to those with a drinking problem, I try to stay away from them when they have to manifest decisions.

    As I get older, and without being cynical, I am often surprised that so much gets done, given the 'weakest link' of some --not all--'key' players being alcohol or drugs. I've seen a huge increase in alcoholism in my peers in the last decade:-( Looks like a disease of the young and then the old..

    Incidentally, that dean had an alcohol fueled fight with his wife and the cops had to intervene. There may have been more than one--but the one I know about hit the papers.

    I saw a LOT of that 'self-medication' (in others) in the music business in the 80's- with tragic results. Although impeded, I avoided being tragic. Good survival skills....

    WA3FET has a standing joke that I can never finish more than a 1/4 of a beer, on the rare occassions when I drink at all. That's me. Others may vary...I mean have a varying opinion on intake ;-)

    73
    Chip W1YW
     
    Last edited: Jul 11, 2020
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  5. KX4OM

    KX4OM Ham Member QRZ Page

    I'm wondering how that is non-obvious, and is simply replicating a lot of prior art. Novices in the US Patent and Trademark Office, I guess.
     
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  6. W9YW

    W9YW Premium Subscriber QRZ Page

    An astute observer would look at the patent and also the prior art. The planet is full of prior art, but putting prior art together in a novel way can be patented.

    The frivolity of software patents and ensuing litigation have given patents a bad name. All this said, your slime of the US Patent Office is unwarranted in this regard.
     
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  7. KX4O

    KX4O Ham Member QRZ Page

    One defense against obviousness, especially so in this particular instance, is the eight decades this, apparently novel, solution never appeared. Believe me, I long pondered this. Best I can come up with is the J antenna's issues became so clouded by mythos, few ever bothered to look for a solution.
     
    N0TZU likes this.
  8. KC9ZHR

    KC9ZHR Ham Member QRZ Page

    I never really thought the Jpole was all that broken.....at least all the ones I have built never ripped a hole in the space-time continuum with common mode current. More experimentation and research is always cool though.
     
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  9. W1YW

    W1YW Ham Member QRZ Page

    The young USPTO examiners often make errors, which can be astutely corrected by experienced inventors and attorneys.

    My patience grows thin on patent matters as I get older. Fortunately, I am at the age of 'make special' (I couldn;t make this up!) which gets inventors over 65 a time break .

    John is free and clear as far as I can tell. He did his homework.

    MO.
     
  10. W1YW

    W1YW Ham Member QRZ Page

    Fractal antennas could have been made, as elements, over 70 years ago..but weren't..I too pondered why 'someone else hadn't done it'.

    Most inventors go through that stage.

    It's a myth of society that technologies get accepted as soon as conceived. And conception often sits and sits and sits, waiting for someone either foolish enough, smart enough, or naive enough, to present it. Sometimes all three!


    73
    Chip W1YW
     
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