[RFI] UPS RFI

[Jim Brown]

On 1/19/2012 2:47 PM, Jeff Blaine wrote:
> Any one have any experience with any of these units, regarding HF RFI emission?

Most UPS units operate in STANDBY mode, monitoring the power line and 
going into ACTIVE mode only when power fails.  They are FAR more likely 
to generate RF trash when they are ACTIVE -- that is, when power has 
failed and they are regenerating power as a train of square waves, or 
"modified" square waves.  In standby mode, the only thing you MIGHT hear 
is digital circuitry associated with monitoring.

73, Jim K9YC