[RFI] Noisy Uninterruptable Power Supply (UPS)

[David Colburn]

CyberPower 1500VA Sine Wave UPS.

Delivered from Costco - abysmally packed (only the display box, which 
was badly dented and torn).

Only scuffs to unit due to protection of corners and display by formed 
styrofoam.

Plugged in and it powered up and charged - pulled the plug and switched 
to backup mode. OK.

Using a Tecsun PL-600 I scanned the room on FM-BC, AM-BC, and up through 
SW - lots of existing

noise sources from computers and power supplies (hobby/radio room is all 
steel so no impact on

antenna-sourced reception).

Plugged in UPS and discovered that the RFI radiates only from one side - 
looking at the faceplate,

it would be the left side.

RFI is primarily AM-BC - 80 meters, after that it fades quickly.

Using a handheld 2/440 TYT I found no RFI on 2m or 440.

Obviously very crude testing but thought I'd share for consideration.

David, KD4E