On 31/08/17 22:56, Jim Brown wrote: > 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).
I had a SmartUPS 750, and it was very bad. Put out crud all the way from VLF to VHF. I threw it away in the end. In the shack I use a much older APC Back-UPS 500 for the computer, which doesn't seem to cause any problems. I've had to replace the battery every 3-4 years, but that's to be expected. 73, Richard G4DYA ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
