[Elecraft] UPS Can Be a Noise Source

[john at kk9a.com]

I have a couple CyberPower uninterruptable power supplies in my shack and I
have noticed no issues RX or TX.

John KK9A


Randy Farmer w8fn wrote: 
Thu Aug 31 20:09:52 EDT 2017

Hmmm. I had a Cyber Power 1500VA unit for a while on my station, but one 
day I transmitted on 12 meters and something inside the thing made a 
"pop". This was followed by a loud "crack" and the UPS expired then and 
there. I should note I have an extremely difficult RF environment on my 
tiny urban lot (a second floor shack with a SteppIR 3L about 15 feet 
directly over the operating chair). This might have been a one-off 
thing, but if you're going to use one of the Cyber Power devices, check 
it at LOW RF levels on all bands for EMI problems.

73...
Randy, W8FN