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UPS causes RFI interference

APC UPS for Home and Office Forum

Schneider Electric support forum for our APC offers including Home Office UPS, Surge Protectors, UTS, software and services and associated products designed to share knowledge, installation, and configuration.

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KenK_apc
Crewman
Crewman
0 Likes
3
332

UPS causes RFI interference

This was originally posted on APC forums on 4/14/2008


I have a APC UPS 1000W unit. I uses it to protect and back up my A.C. power for
Amateur Radio Equipment. Between 1.8-7MHz there is a terrible buzz sound
showing up on my Amateur Radio's receiver. I tracked it down to the UPS.

I did a little snooping on the Web and found this to be a common problem with UPS
units that are used by Amateur Radio Operators.

The only way I could eliminator the terrible radiated emission sounding like a buzz
was to first remove the UPS power cord then hit the power button.
It is not the equipment plugged into the UPS. I had nothing connected to
the back of the UPS other than its own line cord.

Would be interested in know if there is a fix for this.

Thank you,
Ken


Accepted Solutions
KenK_apc
Crewman
Crewman
0 Likes
0
330

Re: UPS causes RFI interference

Running a long extension cord would make things worst because it was radiating from the line cord.

I did wrap the line cord with several turns through a clamp on piece of ferite material very close to where

the line cord exits the UPS.   The APC units where old and the batteries started to fail.  The cost of

the replacement batteries where more than buying another 1000W UPS from another company that offered sinewave output.

 

The replacement unit does not cause the RFI problem

 

K

 

 

See Answer In Context

Tags (1)
3 Replies 3
EZ_Button_apc
Commander
Commander
0 Likes
0
332

Re: UPS causes RFI interference

This was originally posted on APC forums on 4/16/2008


Just curious how close is the UPS to the equipment. It should be at least 3 feet away from it.

Battman_apc
Commander
Commander
0 Likes
1
332

Re: UPS causes RFI interference

This was originally posted on APC forums on 4/24/2008


You could try putting the UPS inside a "Faraday Cage", but that might be troublesome and a little awkward ! I would just try getting the UPS as far from your ham equipment as possible ...like in another room close by ... run a 25 ft extension cord from it.

Dave

Message was edited by: Battman

KenK_apc
Crewman
Crewman
0 Likes
0
331

Re: UPS causes RFI interference

Running a long extension cord would make things worst because it was radiating from the line cord.

I did wrap the line cord with several turns through a clamp on piece of ferite material very close to where

the line cord exits the UPS.   The APC units where old and the batteries started to fail.  The cost of

the replacement batteries where more than buying another 1000W UPS from another company that offered sinewave output.

 

The replacement unit does not cause the RFI problem

 

K

 

 

Tags (1)