[RFI] Noisy Uninterruptable Power Supply (UPS)

[mstangelo at comcast.net]

Oops... K9YC

Mike N2MS
> On 06/25/2023 3:29 PM EDT mstangelo at comcast.net wrote:
> 
>  
> 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
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