[VHFcontesting] UPS with no radio noise???

[Chuck Dietz]

Battery powered tool chargers can emit a lot of noise when charging a
battery.  Good luck, Marshall!

Chuck W5PR

On Tuesday, July 7, 2015, <ejkkjh at gmail.com> wrote:

> 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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