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1. Re: [RFI] Need a Filter (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Tue, 26 Dec 2006 10:32:32 -0700; Bob, Look at the Tripplite Isobar devices at www.tripplite.com which come in metal boxes and have differential and common mode filtering. They are very effective from several hundred KHz thru the HF; /archives//html/RFI/2006-12/msg00074.html (7,244 bytes)
2. Re: [RFI] Buying New Vehicle - RFI issues with these models? (score: 1): Author: "Larry Benko, W0QE" <xxw0qe@comcast.net>; Date: Sat, 04 Aug 2007 12:19:07 -0600; Al, Don't believe the gloom and doom for a minute. I know literally hundreds of folks running HF mobile via my association with the County Hunters. While there are occasional issues running HF at the; /archives//html/RFI/2007-08/msg00002.html (10,046 bytes)
3. Re: [RFI] Buying New Vehicle - RFI issues with these models? (score: 1): Author: "Larry Benko, W0QE" <xxw0qe@comcast.net>; Date: Sat, 04 Aug 2007 15:41:59 -0600; My 2001 Toyota 4Runner and a friends 2005 4Runner are fine at 500W. Another friend just bought a 2007 Toyota Tundra and runs 500W all the time with no problems. I'm sorry to hear that your Sequoia ha; /archives//html/RFI/2007-08/msg00004.html (8,364 bytes)
4. Re: [RFI] Non-transmitting tower causes RFI/EMI? (score: 1): Author: "Larry Benko, W0QE" <xxw0qe@comcast.net>; Date: Wed, 14 Nov 2007 07:44:38 -0700; Rick, Since the neighbor is not too cooperative I would try a different approach. Why not go to the store and buy the exact same model as your neighbor has and put it in your house. I believe this mo; /archives//html/RFI/2007-11/msg00055.html (10,722 bytes)
5. Re: [RFI] AC Line filters- Direct-Drive Washers (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Fri, 04 Apr 2008 08:22:12 -0600; Paul, As an aside, since most of the interference produced by these appliances is common mode current on the AC power cord and it should be fairly easy to take a clip on current probe and connect it; /archives//html/RFI/2008-04/msg00017.html (11,776 bytes)
6. Re: [RFI] New 857, won't TX on 20m - RFI in truck meters and dial lights (kd4e) (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Sun, 14 Sep 2008 11:59:04 -0600; I agree with Jim completely but would like to add one thing. In both war and in troubleshooting the first thing you need to understand is the strength of the enemy. In this case it means at what powe; /archives//html/RFI/2008-09/msg00025.html (9,351 bytes)
7. Re: [RFI] Car Advice (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Wed, 31 Dec 2008 20:10:00 -0700; There is NO chance that any amateur radio transmitter in a vehicle would trip the air bags. They and the anti-lock brakes are at the top of the testing requirements for car manufacturers. The require; /archives//html/RFI/2008-12/msg00139.html (9,447 bytes)
8. Re: [RFI] Fair Rite #31 Mix Material (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Sun, 11 Jan 2009 20:40:59 -0700; Paul, A good first order approximation for all cores is: Effectiveness = (n^2)*u*length*log(OD/ID) where n^2 = #turns squared , u = permeability (43 matl.=850, 31 matl.= 1500), length = dimension tha; /archives//html/RFI/2009-01/msg00073.html (10,868 bytes)
9. Re: [RFI] Fair Rite #31 Mix Material (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Sun, 11 Jan 2009 20:44:20 -0700; Paul, See my long post. Two stacked FT-50-43 cores would have just about the same impedance as a single FT-50-31 (if that part was made). 73, Larry W0QE ______________________________________________; /archives//html/RFI/2009-01/msg00074.html (9,248 bytes)
10. Re: [RFI] Fair Rite #31 Mix Material (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Sun, 11 Jan 2009 21:51:58 -0700; Jim, Ok, you made me fire up the network analyzer (HP8753B). The only cores that I could find which were both from Fair-Rite, and in 31 and 43 materials were 2631102002 (1.025"OD x .510"ID x 1.14" lo; /archives//html/RFI/2009-01/msg00084.html (10,792 bytes)
11. Re: [RFI] Fair Rite #31 Mix Material (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Mon, 12 Jan 2009 07:32:30 -0700; GM Jim, I certainly hope you or anyone else did not think that since I posted the data to the ohm that any high level of accuracy was implied. If accuracies were better than 10% I would be amazed BUT; /archives//html/RFI/2009-01/msg00087.html (12,904 bytes)
12. Re: [RFI] Fair Rite #31 Mix Material (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Mon, 12 Jan 2009 10:13:44 -0700; Mike, This is getting away from the topic even farther but a few people might find it interesting. When doing a cal on the 8753 family of VNAs from HP you have to pick a cal type (7mm, N female, n ma; /archives//html/RFI/2009-01/msg00089.html (16,326 bytes)
13. Re: [RFI] DSL Filter Update (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Sat, 07 Mar 2009 15:20:48 -0700; I have designed many devices in the T1/E1/DSL arena. The line impedance for lines (without bridged taps) was always 110 to 120 ohms. The slight variation was due to the lines being 22, 24, or 26 gaug; /archives//html/RFI/2009-03/msg00011.html (10,205 bytes)
14. Re: [RFI] Samsung TV strange RFI problem (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Sat, 25 Jul 2009 09:27:28 -0600; Gerry, BEFORE doing any of the things that Jim has suggested (which are a very good methodical way to solve problems with your TV and components) I would do the following. Turn on the TV and then eit; /archives//html/RFI/2009-07/msg00026.html (9,213 bytes)
15. Re: [RFI] Maytag - Need quick answers - How can I tell the good ones (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Tue, 13 Oct 2009 17:30:05 -0600; Jim, I have posted the following at least a dozen times but here is my suggestion again: Just buy the washing machine, pay with a credit card, and write on the bill of sale before paying that if the; /archives//html/RFI/2009-10/msg00030.html (8,977 bytes)
16. Re: [RFI] Common mode chokes (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Thu, 18 Mar 2010 19:43:46 -0600; Chuck, Material "J" also known as material "75" generally has a permeability of 5000 while "31" material has a permeability of 1500. I would leave well enough alone. Larry, W0QE _____________________; /archives//html/RFI/2010-03/msg00075.html (7,340 bytes)
17. Re: [RFI] Common mode chokes (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Fri, 19 Mar 2010 00:31:43 -0600; Jim, I beg to differ with you. Effective common mode choking is about impedance and not just resistance. I know that if the impedance is nearly all due to inductance, external capacitances can render; /archives//html/RFI/2010-03/msg00077.html (7,672 bytes)
18. Re: [RFI] DSL RFI Problem Solved (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Fri, 20 Aug 2010 14:47:59 -0600; I take that to mean a snap on core with an inside diameter large enough for RG-8 coax made from type "F" material. Type "F" material is a medium to low frequency material having a permeability of ~30; /archives//html/RFI/2010-08/msg00053.html (8,045 bytes)
19. Re: [RFI] Direct TV DVR problems (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Wed, 03 Nov 2010 12:30:55 -0600; Look at http://www.fair-rite.com/newfair/faqfer.htm With shrinkages of 10-17% in all 3 dimensions the yield must not be great especially for the large parts. However parts that I thought were expensi; /archives//html/RFI/2010-11/msg00017.html (10,748 bytes)
20. Re: [RFI] TDK ZCAT Snap-On EMI Clamp Filters (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Sun, 07 Nov 2010 20:34:40 -0700; Vince, Look at http://www.tdk.co.jp/tefe02/e9a15_zcat.pdf which shows actual impedance curves for the ZCAT devices. They look similar to #43 material except that they have higher significantly higher; /archives//html/RFI/2010-11/msg00042.html (7,650 bytes)

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