[SEDXC] Noise wipes out the bands

[David Thompson]

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