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1. Topband: Computer noise (score: 1): Author: "Rodman, David" <rodman@buffalo.edu>; Date: Tue, 26 Nov 2019 11:41:21 +0000; A few ideas might be helpful here. I was at the station over the weekend and found a significant amount of noise coming from one of two computers in the station. Significant noise S5 at 1820. One com; /archives//html/Topband/2019-11/msg00157.html (7,201 bytes)
2. Re: Topband: Computer noise (score: 1): Author: Artek Manuals <Manuals@ArtekManuals.com>; Date: Tue, 26 Nov 2019 08:41:49 -0500; Could be coming from the power supply? Sometimes simple clip on chokes are not enough either. I have a similar problem here on 20M I have dual (Identical) monitors . One has an irritating but not deb; /archives//html/Topband/2019-11/msg00161.html (8,543 bytes)
3. Re: Topband: Computer noise (score: 1): Author: Frank Krozel <kg9hfrank@gmail.com>; Date: Tue, 26 Nov 2019 07:44:58 -0600; I have an HP laptop charger that sings like mad. Interestingly enough I have another identical one that is absolutely quiet. Inadvertently, I do forget about that and my noise level jumps up to S-9.; /archives//html/Topband/2019-11/msg00163.html (9,983 bytes)
4. Re: Topband: Computer noise (score: 1): Author: fmoeves <fmoeves@twc.com>; Date: Tue, 26 Nov 2019 09:26:45 -0500; Don't forget lights. I just installed 2 8' 4 bulb t8 lights from Home Depot. Terrible rfi on 160 Cooper lighting sent me new ones with filters in them worked great. HD sell commercial lights with no; /archives//html/Topband/2019-11/msg00164.html (9,556 bytes)
5. Re: Topband: Computer noise (score: 1): Author: "Gary Smith" <Gary@ka1j.com>; Date: Tue, 26 Nov 2019 11:46:59 -0500; I second the power supply as well. I used to build a computer with every new generation of chip that came out and found the cheaper supplies were usually noisy. There's several good brands today & th; /archives//html/Topband/2019-11/msg00168.html (10,035 bytes)
6. Re: Topband: Computer noise (score: 1): Author: Mark Schoonover <mark@ka6wke.net>; Date: Tue, 26 Nov 2019 09:29:56 -0800; I've had the same problem which is now 100% resolved. I did a video on what I did to clean things up. It wasn't one simple trick it took some effort. https://ka6wke.net/videos/rfi-and-what-to-do-abou; /archives//html/Topband/2019-11/msg00169.html (9,434 bytes)
7. Re: Topband: Computer noise (score: 1): Author: fmoeves <fmoeves@twc.com>; Date: Tue, 26 Nov 2019 12:34:55 -0500; One more I forgot. I have 2 bikes and I have battery tenders on them. These things make lots of noise all the way up to 40m.Battery Tender is the brand. I put timers on them so they operate when I'm; /archives//html/Topband/2019-11/msg00170.html (10,568 bytes)
8. Re: Topband: Computer noise (score: 1): Author: Michael Walker <va3mw@portcredit.net>; Date: Tue, 26 Nov 2019 12:50:46 -0500; I have now tossed all my Amateur switching supplies (almost). The older they got, the noisier they got. The last one to go was the Alinco DM-330V. I really liked this as a bench supply, but its time; /archives//html/Topband/2019-11/msg00171.html (7,888 bytes)
9. Re: Topband: Computer noise (score: 1): Author: Bill Cromwell <wrcromwell@gmail.com>; Date: Tue, 26 Nov 2019 13:06:23 -0500; Hi, One solution is to use batteries. Charge the batteries while you are *NOT* using the radios and noisy power supplies won't interfere (unplug those rascals). I am using a combination of batteries; /archives//html/Topband/2019-11/msg00172.html (9,618 bytes)
10. Re: Topband: Computer noise (score: 1): Author: GGLL via Topband <topband@contesting.com>; Date: Tue, 26 Nov 2019 19:16:55 -0300; Cheap power supplies lack mains input filtering at the PCB, that is, at least one mixed or common mode inductor, three or four capacitors, a couple of resistors. The best ones also add a similar filt; /archives//html/Topband/2019-11/msg00175.html (9,903 bytes)
11. Re: Topband: Computer noise (score: 1): Author: YL2VW <yl2vw@lral.lv>; Date: Fri, 29 Nov 2019 15:59:16 +0200; Hi I suggest checking if there is good electrical contact between the metal casing of the PC power supply unit (PSU) and the computer metal case itself - scratch off the case painting under screws ke; /archives//html/Topband/2019-11/msg00189.html (10,349 bytes)
12. Re: Topband: Computer noise (score: 1): Author: Pete <n4zr@comcast.net>; Date: Fri, 29 Nov 2019 16:58:35 -0500; Corcom makes a variety of filters that are designed to replace the AC power input connector on PC power supplies. I have done this on two and had good results. 73, Pete N4ZR Sent from my iPhone _____; /archives//html/Topband/2019-11/msg00190.html (11,446 bytes)

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