[RFI] Noisy Uninterruptable Power Supply (UPS)

[mstangelo at comcast.net]

Remember that K(YC ordered the model with Power Factor Correction (PFC). Products with PFC usually have better filtering characteristics.

Costco does not stock it but it is available on Amazon:

<https://www.amazon.com/CyberPower-CP1500PFCLCD-Sinewave-Outlets-Mini-Tower/dp/B00429N19W

Mike N2MS



> On 06/25/2023 2:38 PM EDT David Colburn <qrv at kd4e.com> wrote:
> 
>  
> 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