QRN or QRM?

Discussion in 'General Technical Questions and Answers' started by KI6J, Oct 30, 2009.

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  1. KI6J

    KI6J Ham Member

    If my neighbor fires up an arc welder, is the interference QRN or QRM? What about power line noise?
    Stuart
     
  2. KL7AJ

    KL7AJ Ham Member

    That is QRN.
     
  3. WM5Q

    WM5Q Ham Member

    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." :)
     
  4. AG3Y

    AG3Y Ham Member

    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. K9ZMD

    K9ZMD Subscriber

    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 :p ).
     
  6. AG6WT

    AG6WT Ham Member

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

    ...Having that problem now with the next door neighbor's plasma TV :mad:
     
  7. W0IS

    W0IS Ham Member

    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/pages/q-signals-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. KB3LIX

    KB3LIX Ham Member

    Both examples are man-made...
    Hence QRM.
     
  9. K4KB

    K4KB Ham Member

    In this case it is QRN where the N, stands for Neighbor
     
  10. K7KBN

    K7KBN Ham Member

    QRH is already used:
    As a question (QRH?): Does my frequency vary?
    As a statement (QRH): Your frequency varies.
     
  11. K7JBQ

    K7JBQ Moderator

    How about QSOB?

    73,
    Bill
     
  12. N4CR

    N4CR XML Subscriber

    QRW = Welding
    QRP = Plasma TV
    QRL = Power Line Noise
    QRB = BPL
    QRS = Something around here is making a godawful racket!

    Never mind the convention. What we need here is invention! ;)
     
    Last edited: Oct 31, 2009
  13. KD8GFC

    KD8GFC Ham Member

    Im not sure. Should I break out some popcorn for this thread ??
     
  14. KA4AAA

    KA4AAA Ham Member


    How about:

    QRSTOPWELDINGWHILEIAMTRYINGTOWORKDX?!???

    Yeah.....
     
  15. KI6J

    KI6J Ham Member

    How about QSOB?
    That's exactly what I've been calling it! Without the Q.
     
  16. K0RGR

    K0RGR Premium Subscriber

    I'm with AG3Y - 'M' is for man-made.

    Actually, that welder is not much different from radio transmitters of the 19-teens and early 20's. The only difference is that spark-gaps were tuned so that most of the hash they generated happened near one frequency.

    When the family would go out for our Sunday drives, when we passed a power station, my longtime ham dad would make a remark about the "QRM factory". I've always avoided living near 'QRM factories', though I know one DXer who lives a block from one and says he can't hear it.
     
  17. AG3Y

    AG3Y Ham Member

    We have a quarry right in the center of town, and of course the equipment is run with LOTS of electricity.

    You cannot drive within a block of the transformer yard without your car radio being SWAMPED with 60 Hz hash !
     
  18. KJ6CEA

    KJ6CEA Guest

    Indeed

    how about
    QIFAW interference from arc welder
    QRMFN from neighbor
     
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