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1. Topband: 160m noise (score: 1): Author: "Garry Shapiro" <garry@ni6t.com>; Date: Wed, 3 Nov 2004 18:41:53 -0800; I modified a 100 kHz Loran loop to 1.85 MHz, mounted it on ski racks on my car and cruised the neighborhood looking for low frequency noise sources--those rolling off below 4 to 7 MHz, which are not; /archives//html/Topband/2004-11/msg00028.html (8,236 bytes)
2. Re: Topband: 160m noise (score: 1): Author: Mike Roden - W5JR <w5jr@bellsouth.net>; Date: Wed, 03 Nov 2004 22:50:51 -0500; I, too, have the noises on 160 and 10m and 2m. Same at my Dad's shack. I can almost assure you it is the router. I can connect a single PC directly to the DSL Modem and have fewer issues. I disconnec; /archives//html/Topband/2004-11/msg00029.html (10,830 bytes)
3. Re: Topband: 160m noise (score: 1): Author: "Marc Wullaert" <marc.wullaert3@pandora.be>; Date: Thu, 4 Nov 2004 09:58:14 +0100; Garry, I use also a linksys 4port and wireless G 2.4hgz router. No problem here but I did have to change the power supply. I have CAt 5 (FTP) cable installed in the house and use also the wireless po; /archives//html/Topband/2004-11/msg00030.html (9,861 bytes)
4. Re: Topband: 160m noise (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 09 Nov 2004 00:15:09 -0600; Simple physics -- you cause RF current to flow in a wire, and it WILL radiate. You may CALL it a ground wire, but Mother Nature knows that it is an antenna. Yes, these beasts are well known as HF noi; /archives//html/Topband/2004-11/msg00046.html (10,320 bytes)
5. RE: Topband: 160m noise (score: 1): Author: "Garry Shapiro" <garry@ni6t.com>; Date: Tue, 9 Nov 2004 00:23:15 -0800; Topbanders: I emailed the Reflector on 3 November asking for inputs re my discovery that my Linksys BEFSR41 Router/Switch was radiating copious amounts of RF on topband, apparently through the CAT 5; /archives//html/Topband/2004-11/msg00047.html (10,174 bytes)
6. RE: Topband: 160m noise (score: 1): Author: "Jeff Maass" <jmaass@columbus.rr.com>; Date: Tue, 9 Nov 2004 06:59:50 -0500; Isn't #43 material the *wrong* material to use for supressing noise on 160 meters? It's described by Fair-Rite as appropriate for 20 - 300 MHz for EMI suppression. Multiple turns may make it more ef; /archives//html/Topband/2004-11/msg00048.html (9,107 bytes)
7. Topband: 160m noise (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Tue, 09 Nov 2004 07:02:44 -0500; which the line filter component locations on the board are jumpered and that lower-rated, cheaper parts--such as lower-current rectifiers-- are being substituted for beefier parts. These computers ar; /archives//html/Topband/2004-11/msg00049.html (10,041 bytes)
8. Re: Topband: 160m noise (score: 1): Author: "Joseph Dube" <jdube@peoplepc.com>; Date: Tue, 9 Nov 2004 07:28:38 -0500; I had a similar experience with a brand new APC UPS for my computer. The switching supply that recharges the battery was producing strong birdies on just about every , worst on 160 meters. Strange th; /archives//html/Topband/2004-11/msg00050.html (11,412 bytes)
9. Re: Topband: 160m noise (score: 1): Author: BobK8IA@aol.com; Date: Tue, 9 Nov 2004 08:20:07 EST; In a message dated 11/9/04 5:16:40 AM US Mountain Standard Time, btippett@alum.mit.edu writes: To make a long story short, the problem was a switching power supply in a new white box computer - -- --; /archives//html/Topband/2004-11/msg00051.html (9,668 bytes)
10. Topband: 160m noise (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Tue, 09 Nov 2004 08:42:42 -0500; the EMI products that can attenuate this headache. I see that Corcom and others have slick "entry modules", essentially an AC receptacle with a filter enclosed, to replace the one on the power supply; /archives//html/Topband/2004-11/msg00052.html (10,917 bytes)
11. Re: Topband: 160m noise (score: 1): Author: Earl W Cunningham <k6se@juno.com>; Date: Tue, 9 Nov 2004 07:40:21 -0800; "...Until I recently erected a pair of K9AY loops, the noise was not even evident on my normal 160m antennas, a Inv V and an In L." == The noise from a well-filtered switching power supply is usually; /archives//html/Topband/2004-11/msg00053.html (8,414 bytes)
12. Re: Topband: 160m noise (score: 1): Author: "K9AY" <k9ay@k9ay.com>; Date: Tue, 9 Nov 2004 10:33:05 -0600; -- While common-mode feedline pickup is a known culprit for this type of noise, I'll put better odds on direct radiation. The quick test is whether the noise changes as the pattern is switched. If i; /archives//html/Topband/2004-11/msg00054.html (9,167 bytes)
13. Re: Topband: 160m noise (score: 1): Author: BobK8IA@aol.com; Date: Tue, 9 Nov 2004 11:41:35 EST; I know that the best way to cure a problem is to nip it in the bud at the source, however Bob's statement suggests that the switching power supply noise is being picked up by the coax feeding the K9A; /archives//html/Topband/2004-11/msg00055.html (8,567 bytes)
14. Re: Topband: 160m noise (score: 1): Author: BobK8IA@aol.com; Date: Tue, 9 Nov 2004 11:57:12 EST; In a message dated 11/9/2004 9:38:00 AM US Mountain Standard Time, k9ay@k9ay.com writes: While common-mode feedline pickup is a known culprit for this type of noise, I'll put better odds on direct ra; /archives//html/Topband/2004-11/msg00056.html (9,157 bytes)
15. Re: Topband: 160m noise (score: 1): Author: Earl W Cunningham <k6se@juno.com>; Date: Tue, 9 Nov 2004 12:26:21 -0800; "Tnx for the advice Earl. I never gave that a thought since my K9AY loops are the furthest away (from the shack) of any antenna on my property (only 1 acre). I'll give the choke balun at antenna a go; /archives//html/Topband/2004-11/msg00057.html (8,231 bytes)
16. Re: Topband: 160m noise (score: 1): Author: W2pm@aol.com; Date: Tue, 9 Nov 2004 22:54:51 EST; I have found my elevated radials to be a major noise source for nearly the entire 1/4 wave length... I had to place my NE Pennant on the other side of the radial with its null to the counterpoise to; /archives//html/Topband/2004-11/msg00058.html (8,523 bytes)
17. Re: Topband: 160m noise (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Wed, 10 Nov 2004 08:57:45 -0500; loops, because of a where two of my 160m Could this be another problem? The horizontal source for nearly the on the other side of it This is another reason to use a good ground system! If your feedl; /archives//html/Topband/2004-11/msg00059.html (9,419 bytes)
18. RE: Topband: 160m noise (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 10 Nov 2004 08:19:05 -0600; No, it's not "sloppy," it's an advanced application of the physics of how ferrites work, and a method of getting very effective suppression from commonly available components. The 20-300 MHz recommen; /archives//html/Topband/2004-11/msg00060.html (9,891 bytes)
19. RE: Topband: 160m noise (score: 1): Author: "Jeff Maass" <jmaass@columbus.rr.com>; Date: Wed, 10 Nov 2004 09:53:45 -0500; Jim: I regretted the use of the term "sloppy" as soon as I hit the Enter key, but of course it was gone by then! I wasn't intending to disparage the use of multiturn chokes. What my early-morning bra; /archives//html/Topband/2004-11/msg00061.html (11,513 bytes)
20. Re: Topband: 160m noise (score: 1): Author: Larry Molitor <w7iuv@yahoo.com>; Date: Wed, 10 Nov 2004 08:13:06 -0800 (PST); If you guys think the computer noise is bad on 160, you should hear what it does to VHF bands. It's realy hard to deal with both ends of the spectrum at the same time because what works for 160 will; /archives//html/Topband/2004-11/msg00062.html (11,475 bytes)

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