[Elecraft] UPS Can Be a Noise Source

[Jim N7US]

And my old, but still functioning with a new battery, APC Back-UPS Office,
500VA/325W UPS is also certified Class B.  It has a "stepped approximation
to a sine wave."

73, Jim N7US

-----Original Message-----

I forgot to add that the manual says it produces a sine wave.

73,  Jim N7US

-----Original Message-----

I have an APC SmartUPS 700, which I bought many years ago from
http://www.refurbups.com/.  The manual says it's certified as Class B.


73,  Jim N7US

-----Original Message-----


On 8/31/2017 11:35 AM, Tox wrote:
> I had a couple racks of APC
> SmartUPS 2000 units with daisychained batteries to give extended 
> holdup to a couple of racks of telecom and server hw. No clue how RF 
> noisy those units are, though.

All of the APC units for which I've seen spec sheets are FCC Part 15 Class A
(the industrial spec, ILLEGAL to sell for residential use, roughly 20 dB
worse than Class B).

73, Jim K9YC