Marshall,
I also have this problem, especially on 6 meters. We have 3 UPS for our
computers, brands are APC and Cyber Power, neither emit any noise that I
have detected. I turn them off, unplug them, no change in noise. I have
found noise in power strip from a bad connection. I have a AC line filter
on power going to rigs, that helps some.
On 6 meters especially and some on 2 meters I have found lots of things in
the house that a good rig, receiver picks up. Some of the worst are small
AC/DC power supplies like on cordless phones. All of our TVs, Plasma, LED,
LCD emit some noise. Ceiling fans with light dimmers. Routers and network
switches.
Even with all these off I still have problems, have not found it yet but its
in the house somewhere, with mains off, no noise. good luck 73
Emory WM3M
-----Original Message-----
From: Marshall-K5QE
Sent: Tuesday, July 07, 2015 12:14 AM
To: VHF Contesting
Subject: [VHFcontesting] UPS with no radio noise???
Hello everyone....I got an MFJ-856(power line noise detector) assembled
today and was preparing to go outside and look for all the nasty power
line noise that we have. I happened to wave it around the shack and I
found some strong noise.....tracing it down, we found that all of our
APC UPS systems(except one) were emitting a boatload of RF crap!!
We also found a simple power strip that was radiating like crazy. How
can a simple power strip produce loads of RF junk??? Beats me.
So, now I need to replace all my UPS units with something that does not
make noise. I have asked a salesman type person and they don't have a
clue about RF noise. None of the UPS units seem to pay any attention to
that...it certainly is not part of their specs.
Does anyone know of a brand / model of UPS that does not emit a bunch of
RFI?? I don't need a huge UPS for each station, but I need something
that is quiet. AFTER we fix the noise in-house, we will go outside and
start with the noise that is coming in on the antennas. I know that I
have a bunch of power line noise too, but I need to have a clean house
before I start with the power company.
I also want to find some power cords, like those on computers and
monitors, that have the built in noise suppressors. I don't know where
to order those from either.
Thanks for any advice / recommendations. If anyone works in that world
I would really appreciate hearing from them.
I hope to get these UPS units replaced before the CQ WW VHF
contest......by the way, I will be looking for everyone on 6M and 2M in
the CQ contest....18 and 19 July....
73 Marshall K5QE
Phone is 409-787-3830 if you want to talk.....
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