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Total 14 documents matching your query.

1. [RFI] Motherboard RFI (score: 1)
Author: Peter Laws <plaws@plaws.net>
Date: Sat, 2 Jan 2010 11:40:55 -0600
Took a little time before the RTTY Roundup to try to track down some noise on my IC746Pro. PC was definitely the cause noise is there even if I stop the system at the GRUB screen so likely not disk-r
/archives//html/RFI/2010-01/msg00000.html (7,513 bytes)

2. Re: [RFI] Motherboard RFI (score: 1)
Author: "Dan Violette" <danki6x@earthlink.net>
Date: Sat, 2 Jan 2010 10:13:41 -0800
Maybe you have bad caps on the MoBo. Was a problem in 5-10 year old MoBos. See: http://en.wikipedia.org/wiki/Capacitor_plague for some info with references. Suppose bad caps could be allowing uninten
/archives//html/RFI/2010-01/msg00001.html (9,752 bytes)

3. Re: [RFI] Motherboard RFI (score: 1)
Author: Tree <tree@kkn.net>
Date: Sat, 2 Jan 2010 10:26:59 -0800
Um - unlikely this is the root cause. Those are bulk capacitors - who main job is to provide stable voltage levels to the silicon components during dynamic changes in the current. The caps that would
/archives//html/RFI/2010-01/msg00002.html (7,978 bytes)

4. Re: [RFI] Motherboard RFI (score: 1)
Author: K8TB <k8tb@bosscher.org>
Date: Sat, 02 Jan 2010 13:36:04 -0500
Peter, is the noise reduction caused by your fingers conductively touching the caps, or by downward pressure? If the later, use an insulated alignment tool and press down on different areas of the MB
/archives//html/RFI/2010-01/msg00003.html (7,839 bytes)

5. Re: [RFI] Motherboard RFI (score: 1)
Author: "Dale Svetanoff" <svetanoff@earthlink.net>
Date: Sat, 2 Jan 2010 12:44:24 -0600
Peter, A few questions: 1. How close is your antenna system (or any part of it) to the offending PC? 2. Does the 746 Pro go quiet with the antenna removed? If should, but if not, then there may be mu
/archives//html/RFI/2010-01/msg00004.html (10,615 bytes)

6. Re: [RFI] Motherboard RFI (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sat, 02 Jan 2010 14:18:43 -0500
Don't forget the power supply. Although it *appears* the noise is coming from one of the com ports, it may not be originating there. My experience has been the two most common sources are the power s
/archives//html/RFI/2010-01/msg00005.html (14,497 bytes)

7. Re: [RFI] Motherboard RFI (score: 1)
Author: "Wes Attaway \(N5WA\)" <wesattaway@bellsouth.net>
Date: Sat, 2 Jan 2010 13:26:19 -0600
Dan, here are a few ideas: You indicate that the noise was somewhat suppressed with a snap-on choke. This indicates to me that more choke suppression would be beneficial. In my experience, winding a
/archives//html/RFI/2010-01/msg00006.html (11,880 bytes)

8. Re: [RFI] Motherboard RFI (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 03 Jan 2010 17:00:26 -0800
Yes. http://audiosystemsgroup.com/RFI-Ham.pdf When thinking about HOW this happens (and how to fix it), it helps to realize that the equipment design error that we audio folks call "the pin 1 problem
/archives//html/RFI/2010-01/msg00007.html (8,468 bytes)

9. Re: [RFI] Motherboard RFI (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 03 Jan 2010 21:08:00 -0800
That's a great approach on a circuit board where you're the designer and the resonance is relatively close to the ferrite alone. The techniques I've outlined are primarily for "after the fact" and ou
/archives//html/RFI/2010-01/msg00008.html (7,799 bytes)

10. Re: [RFI] Motherboard RFI (score: 1)
Author: Peter Laws <plaws0@gmail.com>
Date: Mon, 4 Jan 2010 20:25:35 -0600
Even when I press on the board itself, a non-conductive area, the interfering signal changes character. All wires, not really sure which is closest, but none closer than, say, 30' (in the up directio
/archives//html/RFI/2010-01/msg00009.html (9,140 bytes)

11. Re: [RFI] Motherboard RFI (score: 1)
Author: Peter Laws <plaws0@gmail.com>
Date: Mon, 4 Jan 2010 20:27:21 -0600
Physical pressure - caps were just handy and near the offending part of the board (where all the ports are). Will try here in a bit with something non-conductive to be sure. -- Peter Laws | N5UWY | p
/archives//html/RFI/2010-01/msg00010.html (8,526 bytes)

12. Re: [RFI] Motherboard RFI (score: 1)
Author: Peter Laws <plaws@plaws.net>
Date: Mon, 4 Jan 2010 20:31:48 -0600
I can still hear it a little, but it's definitely stronger when connected. It's a home-brew, but it's a good Antec case and all the various and sundry hole-fillers are present. There are no neon ligh
/archives//html/RFI/2010-01/msg00011.html (9,119 bytes)

13. Re: [RFI] Motherboard RFI (score: 1)
Author: Peter Laws <plaws@plaws.net>
Date: Mon, 4 Jan 2010 20:43:30 -0600
(deleting the rest for brevity, but I did read it!) System was originally built by a coworker that moved to Tokyo in 2004. In fact, it's hostname is set to JA1GG - his initials were GG. He gave it to
/archives//html/RFI/2010-01/msg00012.html (9,543 bytes)

14. Re: [RFI] Motherboard RFI (score: 1)
Author: Peter Laws <plaws@plaws.net>
Date: Mon, 4 Jan 2010 21:58:10 -0600
Made a little progress this evening. Took the PC apart and took the MoBo out. Found where Thor had been and caused an SMD cap to leave this plane of existence. Again, Thor's visit was in 2007 and I h
/archives//html/RFI/2010-01/msg00013.html (9,454 bytes)

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