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Total 21 documents matching your query.

1. [RFI] Computer birdies (score: 1): Author: Steve <steve65@suddenlink.net>; Date: Tue, 26 Jun 2012 10:16:38 -0400; Hi all, I'm having a problem with birdies at approximately 61KHz spacing on 40 through 6 meters. Aside from just being annoying, they are of great enough amplitude to mask desired signals. The source; /archives//html/RFI/2012-06/msg00052.html (7,777 bytes)
2. Re: [RFI] Computer birdies (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Tue, 26 Jun 2012 07:24:27 -0700; It's the Ethernet stuff related to the router. The cables are acting as transmitting antennas, your ham antennas are receiving the noise. The solution is multi-turn ferrite chokes on each of those ca; /archives//html/RFI/2012-06/msg00053.html (7,177 bytes)
3. Re: [RFI] Computer birdies (score: 1): Author: Steve <steve65@suddenlink.net>; Date: Tue, 26 Jun 2012 14:11:09 -0400; Thank you Jim. I happen to have a few #31 cores, 2.4in OD. At the computer end of the ethernet cable I began threading the cable through the core and made some observations along the way as I measure; /archives//html/RFI/2012-06/msg00054.html (9,353 bytes)
4. Re: [RFI] Computer birdies (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Tue, 26 Jun 2012 14:38:09 -0400; It's a growing problem as more and more people install home networks. Some of these routers are really nasty and can be heard for hundreds of feet. It's relatively easy to cure with Jim's approach in; /archives//html/RFI/2012-06/msg00055.html (8,691 bytes)
5. Re: [RFI] Computer birdies (score: 1): Author: "charlie@thegallos.com" <charlie@thegallos.com>; Date: Tue, 26 Jun 2012 14:49:49 -0400; I personally found, with my router and computers that the computer was the really bad end, but putting cores on both ends helped too, as there was some low level stuff coming from the router Sent fro; /archives//html/RFI/2012-06/msg00056.html (9,473 bytes)
6. Re: [RFI] Computer birdies (score: 1): Author: Phil <na4m@arrl.net>; Date: Tue, 26 Jun 2012 13:53:15 -0500; Would using shielded CAT6 cables reduce the Ethernet RFI? With or without winding around a toroid? 73 Phil NA4M -. .- .- -- Phil Duff Georgetown, TX _______________________________________________ RF; /archives//html/RFI/2012-06/msg00057.html (9,714 bytes)
7. Re: [RFI] Computer birdies (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Tue, 26 Jun 2012 12:34:27 -0700; It will depend on how (and if) the cable shield is terminated at the noise source end(s). If the shield termination is proper, it could help a lot. If the shield connection is improper, it could even; /archives//html/RFI/2012-06/msg00058.html (7,931 bytes)
8. Re: [RFI] Computer birdies (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Tue, 26 Jun 2012 12:45:20 -0700; Yes. Each end of a cable connected to ANY digital electronics should be viewed as a potential noise source, but as several have noted, some products are much noisier than others. Steve -- many thanks; /archives//html/RFI/2012-06/msg00059.html (8,194 bytes)
9. Re: [RFI] Computer birdies (score: 1): Author: Phil <na4m@arrl.net>; Date: Tue, 26 Jun 2012 15:56:27 -0500; As a quick check/test I found some likely Ethernet RFI crud close to 50.120 and 3.770. Shut computer down - 50.120 E'net crud stops as computer shuts off. Disconnected E'net cable from computer & rou; /archives//html/RFI/2012-06/msg00060.html (8,696 bytes)
10. Re: [RFI] Computer birdies (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Tue, 26 Jun 2012 14:22:54 -0700; I completely agree, and have been using a home network that's 99% wireless for six years. The only wired connections are from the wireless router to the cable modem, and from the router to two PCs on; /archives//html/RFI/2012-06/msg00061.html (8,426 bytes)
11. Re: [RFI] Computer birdies (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Tue, 26 Jun 2012 17:25:44 -0400; One problem...the wireless is too slow by far and requires more attention to security. Apparently more than half of personal Wi-fi networks/connections are unsecure. Even with a gigabit CAT6 network; /archives//html/RFI/2012-06/msg00062.html (9,805 bytes)
12. Re: [RFI] Computer birdies (score: 1): Author: Richard Battles <wb4byq@gmail.com>; Date: Tue, 26 Jun 2012 16:27:54 -0500; Change the ethernet speed to 10mb half duplex and the birdies will go away. if the router is wireless and the modem is connect by cat 5e, again switch to 10mb half duplex, i have not tried cat6 yet.; /archives//html/RFI/2012-06/msg00063.html (9,578 bytes)
13. Re: [RFI] Computer birdies (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Tue, 26 Jun 2012 14:39:25 -0700; Speed is relative to your individual needs. My wireless network is pretty fast. It's a dual band system, and the router supports both bands simultaneously. Speed will depend on the wireless hardware; /archives//html/RFI/2012-06/msg00064.html (8,001 bytes)
14. Re: [RFI] Computer birdies (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Tue, 26 Jun 2012 18:30:14 -0400; True and 5 computers with nigh onto 40,000 high res photos, programming...etc equates to about 6 Terabytes each. Likewise. I have the fastest I could get but even at 100 feet signal is poor. OTOH eve; /archives//html/RFI/2012-06/msg00065.html (9,576 bytes)
15. Re: [RFI] Computer birdies (score: 1): Author: EZ Rhino <EZRhino@fastmovers.biz>; Date: Tue, 26 Jun 2012 17:46:38 -0600; I have wireless internet....dish on the roof pointed at a tower across the valley, and ethernet cable from the dish to my router, with a "power injector" inline. I had the same issues reported here.; /archives//html/RFI/2012-06/msg00067.html (10,155 bytes)
16. Re: [RFI] Computer birdies (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Tue, 26 Jun 2012 18:02:56 -0700; BUT -- there is no need to give up data rate if you use common mode chokes to kill the RF trash! 73, Jim K9YC _______________________________________________ RFI mailing list RFI@contesting.com http:; /archives//html/RFI/2012-06/msg00068.html (8,016 bytes)
17. Re: [RFI] Computer birdies (score: 1): Author: EZ Rhino <EZRhino@fastmovers.biz>; Date: Tue, 26 Jun 2012 20:55:16 -0600; True, if I was actually getting speeds over 10Mbs, which I am not :) Chris KF7P BUT -- there is no need to give up data rate if you use common mode chokes to kill the RF trash! 73, Jim K9YC _________; /archives//html/RFI/2012-06/msg00069.html (8,401 bytes)
18. Re: [RFI] Computer birdies (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Wed, 27 Jun 2012 17:57:20 -0400; CAT 5 and 6 do not like tight turns, but 6 is far better than 5 with dividers separating each pair. I would suggest when winding the chokes just do not try to make the turns nice and compact. IE, Tig; /archives//html/RFI/2012-06/msg00073.html (9,935 bytes)
19. Re: [RFI] Computer birdies (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Wed, 27 Jun 2012 15:30:03 -0700; That's due to deformation of the twisted pairs, and yes, it can degrade data rate. BUT -- Belden does CAT5/6/7 better. First, all of their Ethernet cables, even the cheapest ones, use twisted pairs t; /archives//html/RFI/2012-06/msg00074.html (9,087 bytes)
20. Re: [RFI] Computer birdies (score: 1): Author: "Mike" <hinrgdj@gmail.com>; Date: Wed, 27 Jun 2012 18:03:51 -0500; I feel the pain of the cable plant guy that has to terminate/punch down those "deluxe-siamesed" gigabit cables in BIX blocks for a living wiring up a telco room :-( Mike, K4EAR data cables, with with; /archives//html/RFI/2012-06/msg00075.html (10,145 bytes)

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