[SEDXC] Noise wipes out the bands

[k4hb]

The first step is to pull the main switch while listening on a portable. You may have to be extra nice to your wife, but you need to know for sure if the RFI is coming from your house or elsewhere. 

The ARRL has some good information about RFI. On this page they have sound files for different types of interference. http://www.arrl.org/sounds-of-rfi

If you try all you can and can't find the source of your RFI, the ARRL may can help you if you send them sound bytes of the interference. A friend of mine did that and sent sound bytes to Mike, W1MG, at the ARRL. Mike knew right away that it was a water softener, which was found in the guy's neighbor's basement.

 73, Hal K4HB
http://www.k4hb.comhttp://www.Hi-TechRedneck.comhttp://www.k4hb.com/postage.html 


--- On Thu, 11/29/12, David  Thompson <thompson at mindspring.com> wrote:

From: David  Thompson <thompson at mindspring.com>
Subject: [SEDXC] Noise wipes out the bands
To: sedxc at contesting.com, sedxc at yahoogroups.com
Date: Thursday, November 29, 2012, 7:51 PM

My son told me his speaker starts to hum in the presence of a strong signal and the humming started at 6:30AM this morning.
I told him I was not transmitting and turned on the Yaesu in AM mode and all the bands from 160 to 15 had strong buzzing with a metal sound in the background.  Best guess its a motor with bruches but those switching power supplies might sound the same way.

I picked up my little sport hand held AM radio and the noise is all over the house.  The noise drops off walking to the house on the south side of me. The house on the other side has a fence but walking around the fence keeps the AM radio hopping even wiping out WSB.

I have been all over my house and turned off TV sets and electronics and no change.  I checked the AC panel and the door bell buzzer.  No change.  I have a new Heating/AC unit with a battery operated pump but no noise on AM from that.  The wife is not keen on flipping the master switch to see if the noise goes away or not.  The last thing I can do is cut all the sons big PC equipment (it has 4 power supplies) leaving the speaker on to see if that is the problem.

The noise is so loud on the am hand held that it echos.

I did notice that trying to hear JX9JKA on 24 recently that I had a noise that came up at about 9AM and disappeared  about 3PM but never listened to it on AM just SSB.

The house is 34 years old but the wiring is in good shape.  Except for 10 and 12 meters I am off the air with this noise.

Any ideas where to look?

73 Dave K4JRB 

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