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Thread: QRN or QRM?

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  1. #1
    Join Date
    Aug 2009
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    Burbank, CA
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    Default QRN or QRM?

    If my neighbor fires up an arc welder, is the interference QRN or QRM? What about power line noise?
    Stuart

  2. #2
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    Quote Originally Posted by KI6J View Post
    If my neighbor fires up an arc welder, is the interference QRN or QRM? What about power line noise?
    Stuart
    That is QRN.
    "The more you know, the less you don't know."

  3. #3
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    Yep, if I had to pick one or the other, it's QRN. But more properly, QRN is atmospherics (band noise, lightning noise), while QRM is an interfering signal from another radio transmitter. In that more strict sense, the arc welder and powerline noise are neither; I'd just call them that. "I am having terrible noise when I try to work DX while I'm welding."
    Wayne WM5Q
    Tyler, TX

  4. #4
    Join Date
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    No, actually QRN stands for interference caused by Nature ! QRM on the other hand is interference caused by Man

    Note the difference between N and M !

  5. #5
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    Quote Originally Posted by AD5ST View Post
    "I am having terrible noise when I try to work DX while I'm welding."
    Welding is one activity that should not be combined with operating an amateur radio station. My wife immediately thought of one more (as if she needed another excuse ).

  6. #6

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    I'd call it QRFN as in QR F***ing Neighbor.

    ...Having that problem now with the next door neighbor's plasma TV

  7. #7

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    I consulted my up-to-date list of Q signals (this one says it was updated in '09, so you can't get more up-to-date than that):

    http://www.telegraph-office.com/page...nals-1909.html

    According to this, "QRN" means, "Atmospherics are very strong."

    So I would say that it's not "QRN".

    "QRM", on the other hand, to me implies that the interference is coming from another intentional radiator of some kind.

    IMHO, various forms of "line noise" should be referred to as "noise" rather than "QRN" or "QRM".

    But it's an excellent question. It shares attributes of each. It sounds like QRN, but it has the important QRM attribute of being man made. In the interest of inclusive language, I suppose we ought to change the hame to QRH, since it is human-made.

  8. #8
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    Both examples are man-made...
    Hence QRM.
    Politicians...Round em up...Drown them all and start over !

  9. #9
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    In this case it is QRN where the N, stands for Neighbor
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  10. #10
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    Quote Originally Posted by W0IS View Post
    I consulted my up-to-date list of Q signals (this one says it was updated in '09, so you can't get more up-to-date than that):

    http://www.telegraph-office.com/page...nals-1909.html

    According to this, "QRN" means, "Atmospherics are very strong."

    So I would say that it's not "QRN".

    "QRM", on the other hand, to me implies that the interference is coming from another intentional radiator of some kind.

    IMHO, various forms of "line noise" should be referred to as "noise" rather than "QRN" or "QRM".

    But it's an excellent question. It shares attributes of each. It sounds like QRN, but it has the important QRM attribute of being man made. In the interest of inclusive language, I suppose we ought to change the hame to QRH, since it is human-made.
    QRH is already used:
    As a question (QRH?): Does my frequency vary?
    As a statement (QRH): Your frequency varies.
    Semper ubi sub ubi. 73
    K7KBN CWO4 USNR Ret.

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