Hi all,

I've done the google search already, so I hope maybe one of you has an
answer.

I am in the beginning stages of setting up my station, and I am getting
lots of EMI from various applicances in the apartment. I used an SW
pocket radio as a sniffer.

It turns out that most of these are throwing out hash back into the AC
line,
and that the AC wall conduits are conducting EMI into the room my wife
allows me to use for my station. My station is on the other side of
the apartment, but it doesn't matter about the physical distance
because the
AC lines are throwing off the worst of the noise. I turned off
EVERYTHING
and was able to reduce the problem enough to hear CW on the 7.050 on my

pocket radio without an external antenna.

Throw everything on, and I could barely hear the signal with antenna,
because
EVERYTHING is going back into the house wiring!!!

From worst offenders to least worst, they a

1) GE Hotpoint refrigerator/freezer.
2) Air conditioning system.
3) Aquarium pump.
4) Overhead florescent lights.
5) Microwave oven (even in in standby mode!).
6) LED alarm clocks (3)
7) Telephone answering machine
8) Cordless telephone base station (900 Mhz)
9) Cable Modem
10) Wireless Router
11) Late model Computer and CRT Monitor.

I have the following assets:

1) I live on the lower floor and have a water pipe just outside the
window
of my station room.

2) I just bought 4 each of 3 amp and 30 amp CORCOM line filters on
Ebay.

3) A bunch of FT-50-43 cores.

4) My wife's loving patience.

Questions:

1) Ferrite 43 material is supposed to attentuate for 20 Mhz and up,
and the
frequencies I want to hear are at 80 thru 20 meters. Should I use
the 73
material instead for wrapping AC cords around toroids for
common-mode
chokes?

2) Do modern refrigerators in apartments use ordinary AC sockets or
3-phase?

3) I have a 1500 watt microwave oven, can I have it also run off a
CORCOM
filter?

3) Can I use a CORCOM filter to isolate EMI from each appliance (30
AMP)
and from the aquarium pump (3 AMP) from the AC lines? Or, do I
also
need common-mode chokes?

4) I split the wall wires of the wall wart and would each polarity
around
its own FT-50-54 about 4 times. Will this be remotely as effective
as
winding the wall-wart cord around a larger toroid?


Suggestions, anyone?

Thanks,

The Eternal Squire