Hi Barry, I wasn't the one who experienced the epiphany; have to lay that at Stan's feet. :)
Frankly, it's not a big problem for me. However, it did connect a couple dots in that I was at my brother-in-law's house operating on the battery whilst visiting. I remarked that the noise floor was very low and just attributed it to his QTH. Never connected the fact that perhaps it was just the local noise sources and I should be less concerned about QRM from the neighbors and neighboring rooms, and more about what I was feeding the rig and the other sources in the room. I will now be spending some time rearranging things to try this out and get my noise floor down even further. On Sun, Nov 19, 2017 at 20:39 Barry <k3...@comcast.net> wrote: > Rich, > You just discovered the problem with switching power supplies. I'm > unaware of any computer power supply that isn't a switcher, but for most > 12 volt needs an analog supply should fix the problem. The only downside > that I can see is weight; analog supplies can be a bunch heavier, but > they are RF quiet. > > There some quiet switchers out there. You just need to do some > research to discover those. One that is quiet is the Tentec. It is > actually an Astron that Tentec did some work on. I think the one > Elecraft sells is quiet. Bit, you really need to investigate before > buying a switcher. > > 73, > Barry > K3NDM > > ------ Original Message ------ > From: "rich hurd WC3T" <r...@wc3t.us> > To: "stan levandowski" <sjl...@optonline.net> > Cc: Elecraft@mailman.qth.net > Sent: 11/19/2017 7:31:48 PM > Subject: Re: [Elecraft] (OT) - Unplanned Discovery > > >Wow. > > > >Going to try that. Thanks for this great post. > > > >On Sun, Nov 19, 2017 at 19:23 stan levandowski <sjl...@optonline.net> > >wrote: > > > >>Most people on this Reflector are well educated and intelligent. > >>Apparently, I'm the exception because this one got by me. I'm only > >>owning up to this in the hope that it might help someone else on the > >>Reflector. > >> > >>For the last couple of years I've been bothered by a high background > >>noise level. It happened on my K1, K2, K3, KX2 and KX3. I > >>attributed > >>this to the fact that my antenna has been in my attic for the last > >>fifteen years and propagation hasn't been good lately. > >> > >> > >>I just got official permission from the HOA to install an end fed wire > >>outside. I was thrilled. I put it up. The darn thing wasn't any > >>better than the attic doublet. Noisy as heck! What a letdown! > >> > >> > >>So I'm laying in bed last night reflecting on how my little KX1 was > >>the > >>only Elecraft radio that never had noise problems and seemed to have a > >>receiver quieter than my K3. > >> > >> > >>Whoa! The KX1 always ran on batteries...could it be????? > >> > >> > >>I just took delivery on a brand new Kx33 Low RFI power supply a couple > >>days ago. It was advertised in the last QST. Previous to that, I've > >>been using a Samlex 1235M. For the heck of it, I connected my K2 to > >>an > >>SLA battery and the noise was still there. But when I disconnected > >>the > >>Kx33 power supply from the wall, the noise level dropped dramatically. > >>Then I switched to the Samlex and the noise came back. Back on the > >>battery, the noise dropped again as long as the power supplies were > >>unplugged and dead. > >> > >> > >>I have a laptop next to the computer. When I pulled the plug on the > >>laptop supply, the rest of the noise went away. I was down to S0/S1 > >>and > >>CW signals were popping out all over the band again. Running the > >>computer on its internal battery did NOT contribute any noise. It was > >>the computer power supply. > >> > >> > >>Now that I am totally on batteries, I also appear to be immune from > >>both > >>the gas furnace and the dishwasher motor both of which caused me > >>problems when using the AC supplies. YES, I HAD CHOKES ON ALL > >>SUPPLIES, > >>CABLES, WIRE. > >> > >> > >>I've been on the air all day with my new outside antenna, on battery > >>power, making contacts near and far and I feel like I've hit the > >>jackpot. Since I'm totally QRP and CW, being limited to batteries is > >>not an issue. > >> > >> > >>If you're going to check your own supplies out, remember they've got > >>to > >>be OFF/UNPLUGGED from the wall. Just disconnecting them from the > >>radio/computer isn't enough. It's RF. > >> > >> > >>73, Stan WB2LQF > >> > >> > >> > >> > >> > >> > >>1 > >> > >>______________________________________________________________ > >>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 r...@wc3t.us > > > >-- > >--- > >72, > >Rich Hurd / WC3T / DMR: 3142737 > >PA Army MARS, Northampton County RACES, EPA-ARRL Public Information > >Officer > >for Scouting > >Latitude: 40.761621 Longitude: -75.288988 (40°45.68' N 75°17.33' W) > >Grid: > >*FN20is* > >______________________________________________________________ > >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 k3...@comcast.net > > -- --- 72, Rich Hurd / WC3T / DMR: 3142737 PA Army MARS, Northampton County RACES, EPA-ARRL Public Information Officer for Scouting Latitude: 40.761621 Longitude: -75.288988 (40°45.68' N 75°17.33' W) Grid: *FN20is* ______________________________________________________________ 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
