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References: [ +from:jim@audiosystemsgroup.com: 1809 ]

Total 1809 documents matching your query.

201. Re: [RFI] N6CW TVI (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Fri, 22 Jun 2007 22:01:58 -0700
You are correct, it IS irrelvant. Of course! The proximity that counts is ANTENNAS to the victim equipment, and WIRING for the victim equipment. Jim Brown K9YC ______________________________________
/archives//html/RFI/2007-06/msg00032.html (7,150 bytes)

202. Re: [RFI] N6CW TVI (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 24 Jun 2007 21:38:43 -0700
Plugging and unplugging a cable does THREE very important (and very different) things. First, it removes one device from a circuit. Second, it removes a current path for noise current that may be flo
/archives//html/RFI/2007-06/msg00038.html (9,390 bytes)

203. Re: [RFI] Ethernet Extenders (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 25 Jun 2007 09:16:57 -0700
The problem is only on 40M and 30M. This tells us that it is NOT a grounding problem, nor is it related to noise or the grounding between buildings. The most likely cause is that some wiring is actin
/archives//html/RFI/2007-06/msg00044.html (8,636 bytes)

204. Re: [RFI] Ethernet Extenders (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 25 Jun 2007 12:14:00 -0700
Are you saying that you have this problem transmitting into a dummy load? Hmmm. Maybe RFI in either the 480 or the box that talks to it. Ferrite choke there? Maybe even a software problem, and not an
/archives//html/RFI/2007-06/msg00048.html (10,289 bytes)

205. Re: [RFI] Ethernet Extenders (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 27 Jun 2007 07:47:03 -0700
There s a possible clue. Unbalanced connection between computer and rig. Pin 1 problem in computer sound card for sure, probably also in rig. Also the IR drop problem in the cable shield, but that wo
/archives//html/RFI/2007-06/msg00053.html (8,012 bytes)

206. Re: [RFI] Ethernet RFI UPDATE (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sat, 30 Jun 2007 22:01:33 -0700
not but I took the CAT5 twisted pairs of telco wire that unused in the 6 pair trunk line running between the barn and house (1,000ft) and terminated them to ground at both ends of the line. My thinki
/archives//html/RFI/2007-07/msg00000.html (7,345 bytes)

207. Re: [RFI] ITV in 6 meters..HELP (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 01 Jul 2007 18:19:39 -0700
That is a very common, and very difficult one to fix, because 6 meters (50 - 54 MHz) is right next to Channel 2 TV (54-60 MHz). For a different reason, 6 meters is also difficult for lots of telephon
/archives//html/RFI/2007-07/msg00003.html (7,618 bytes)

208. [RFI] New Version of RFI Tutorial With New Coax Choke Cookbook (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 25 Jul 2007 18:06:39 -0700
I've just posted a new version of my tutorial on RFI, Ferrite Chokes, Baluns, and audio for hams. It has the same filename as the original, but the title shows Rev 1, 25 Jul 07. The new stuff is prim
/archives//html/RFI/2007-07/msg00028.html (7,720 bytes)

209. Re: [RFI] [TowerTalk] New Version of RFI Tutorial With New CoaxChoke Cookbook (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 25 Jul 2007 20:09:37 -0700
Sorry. http://audiosystemsgroup.com/RFI-Ham.pdf Jim _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listinfo/rfi
/archives//html/RFI/2007-07/msg00030.html (7,239 bytes)

210. Re: [RFI] New Version of RFI Tutorial With New Coax Choke Cookbook (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 26 Jul 2007 06:02:42 -0700
Sorry. http://audiosystemsgroup.com/RFI-Ham.pdf 73, Jim K9YC _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listinfo/rfi
/archives//html/RFI/2007-07/msg00031.html (7,179 bytes)

211. Re: [RFI] ATT U-verse Service RFI Issues (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 29 Jul 2007 12:36:06 -0700
Paul, Thanks for recounting your experience. It's input like this that can save a lot of us a lot of trouble, and help others figure out what's going on in another system. One important correction. I
/archives//html/RFI/2007-07/msg00033.html (7,641 bytes)

212. Re: [RFI] Buying New Vehicle - RFI issues with these models? (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sat, 04 Aug 2007 14:10:30 -0700
There are very good and very bad. My 99 Volvo S80 had NO problems. The computer in my 2006 Toyota Sequoia locks up with 100W on 20M. One of these days I'll have time to try to fix it. 73, Jim Brown K
/archives//html/RFI/2007-08/msg00003.html (7,925 bytes)

213. Re: [RFI] Buying New Vehicle - RFI issues with these models? (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sat, 04 Aug 2007 23:50:27 -0700
The RFI problem with the Sequoia is VERY likely a problem with lousy (non-existent) chassis bonding, thanks to more concern with paint than bonding. My ohmeter tests showed that almost nothing is bon
/archives//html/RFI/2007-08/msg00006.html (8,360 bytes)

214. Re: [RFI] RFI Digest, Vol 56, Issue 4 (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 09 Aug 2007 12:54:13 -0700
This is good advice, not only for the hood, but for every connection between elements of the car's body. And I would do it on both hinges, not only one side. 73, Jim K9YC ____________________________
/archives//html/RFI/2007-08/msg00019.html (6,772 bytes)

215. [RFI] Radio "Grounding" (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 09 Aug 2007 14:45:53 -0700
The "need" for grounding a radio is another one of those widely repeated myths. We DO want a good bond of the shield of coax to the body AT THE ANTENNA, we DO want the DC power pair (preferably TWIST
/archives//html/RFI/2007-08/msg00021.html (8,537 bytes)

216. Re: [RFI] Radio "Grounding" (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 09 Aug 2007 18:04:33 -0700
Belden 1311A and 1313A are sold as loudspeaker cable. Gepco (a very good Chicago company) makes a #12 twisted pair loudspeaker cable. The insulation is not rated for mains power, but would be fine fo
/archives//html/RFI/2007-08/msg00026.html (7,985 bytes)

217. Re: [RFI] Topband: 160M_AC_BUZZ (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Fri, 10 Aug 2007 12:48:35 -0700
Don't rule out the possibility that it could be a noise-maker in a home or office near you. Examples include battery chargers (for power tools, mobility scooters, etc.), power supplies for consumer e
/archives//html/RFI/2007-08/msg00028.html (6,945 bytes)

218. Re: [RFI] RFI proof audio equipment recommendations (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 16 Aug 2007 20:23:25 -0700
Every powered loudspeaker I've ever seen has had RFI, especially to VHF. It's a combination of lousy shielding, bad circuit layout, and pin 1 problems. You can fix the pin 1 problems with ferrites. T
/archives//html/RFI/2007-08/msg00035.html (7,252 bytes)

219. Re: [RFI] RFI proof audio equipment recommendations (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Fri, 17 Aug 2007 09:50:28 -0700
Hi Bill, I hope that some list members will be able to make it to the fall AES in NYC, where I'm doing a tutorial lecture on RFI. Oct 8, 3:30 - 6:00 pm. Also, Henry Ott is leading off with a Master's
/archives//html/RFI/2007-08/msg00039.html (7,724 bytes)

220. Re: [RFI] Subwoofer resolution (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 19 Aug 2007 09:54:26 -0700
A 2M/440 talkie, Nextel phone, and Blackberry used as a signal injection probe around the device and its I/O wiring are very effective. It might be worth owning a 6M talkie so that one could use it t
/archives//html/RFI/2007-08/msg00044.html (7,475 bytes)


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