[Elecraft] Tracking down S9+ noise on 40M

[Eugene Balinski]

Printers.  They need to be **unplugged** and not just off.
  My HP blasts a lot of noise on 40 when just "off".  

Washing Machines, especiallly the new ones with micro
processors 

Door bell transformers.  Lots and lots  of stories there.
 Google is your friend.  

Outdoor Christmas lights although the season is over

Arcing/cracked power line insulators. See various QST
articles on how to track down and how to build an
Ultrasonic detectror.  One of the best ones was designed by
Jim Hanson W1TRC (SK).  Sometimes you can just stand
outside and hear them especially in wet/foggy wx.  

Street Lights although they usually only manifest
themselves at night

Bad flourscent light fixtures

touch lamps

Neon Lights if you live in a more urban environment

Electric fenses if you live in a rual area

These are just a few that come to mind.  Please do report
back to the group what/if you find.

73
K1NR




On Thu, 19 Jan 2012 13:02:42 -0500
 "Rich - K1HTV" <k1htv at comcast.net> wrote:
> And don't forget ELECTRIC BLANKETS! I just found the
> source of a loud noise
> which appeared to be emanating from a neighbor's house.
> The noise source turned
> out to be an electric blanket with independent control
> boxes and control units
> (rotary controls). Each box was causing either a loud
> click every second or a
> loud AC buzzzzzz when the electric blanket's control was
> set to call for more
> heat. I took a portable Sony AM/FM/SW radio with me to
> the neighbor's house and
> walked around the inside the house with him. At the far
> end of the house the
> signal was moderately loud with the antenna collapsed
> while listening on 10
> Meters. When we got to the master bedroom, the signal got
> noticeably louder.
> Unplugging the AC from one box stopped one of the
> clicks/buzzes. Unplugging the
> second box produced silence. In the bedroom, the noises
> could also be heard on
> broadcast band frequencies, but were not very strongly in
> the AM BC band outside
> the house.
> 
> The frequencies with the strongest signal from a noise
> source is often related
> to the length of the wires attached to it. In this case,
> the signals seemed to
> peak on higher frequencies in the 6M and 10M bands. In
> the case of a noisy power
> line, where the wires are attached to arcing hardware are
> physically longer, you
> can expect to have stronger signals on the lower
> frequencies. But even with
> power lines, in addition to using an AM BC radio, it is
> often helpful to use a
> portable radio that can tune in the 108-130 MHz AM
> aircraft band to find noise
> sources on power line poles.
> 
> In your case, if you can hear the noise on a portable AM
> radio at the breaker
> panel, try killing power to one breaker at a time to see
> which one kills the
> noise. Good luck in playing noise detective!
> 
> 73,
> Rich - K1HTV
> 
> = = =
> 
> From: riese-k3djc at juno.com [mailto:riese-k3djc at juno.com] 
> Sent: Wednesday, January 18, 2012 22:49 PM
> To: kc9ehq2003 at yahoo.com
> Cc: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] Tracking down S9+ noise on 40M
> 
> light dimmers
> touch on off lamps
> plasma tv sets
> 
> bob k3djc
> 
> On Wed, 18 Jan 2012 19:41:33 -0800 (PST) David Dietrich
> <kc9ehq2003 at yahoo.com>
> writes:
> > Hi All,
> > 
> > Could someone please explain the proper way to track
> down RF noise in 
> > and around my house?  
> .....
> 
> > 
> > 73,
> > 
> > David, KC9EHQ
> 
> 
> 
>
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