[BC] Can't Get A Direct Answer

[Ron Nott]

You are correct in stating that the noise goes into the power 
line.  A quick fix is to acquire a ferrite square form (formerly 
available at Radio Shack) and wind several turns of the power cord 
onto it as close to the UPS as you can get it.  This will attenuate 
the pulses coming out on the power cord 
substantially.  Alternatively, you might use a ferrite rod 1" or so 
in diameter.  Wind the power cord on it tightly and tape in place.

Ron Nott, DVP

----- Original Message ----- From: "Tom Dimeo" <mwam at 73kn.net>
Sent: Wednesday, October 24, 2007 10:04 AM


>The UPSs radiate very little noise, the problem is they
>generate a lot of noise into the power line.  Apparently the
>noise is caused by the switching power supply.  Probably
>won't matter in a year or two because it seems like every
>week there is a new noise in the neighborhood.
>
>Been thinking about getting some kind of isolation device at
>the power service entrance point but don't know if it would
>help.