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1. Re: [RFI] CATV Leakage? Horizonal Osc Harmonics (score: 1): Author: Michael Tope <W4EF@dellroy.com>; Date: Mon, 11 May 2009 08:05:35 -0700; If the comcast system is leaking, you should be able to pick-up leakage in the VHF band. I don't have a channel chart in front of me, but at least on CATV channel falls right in the middle of the 2 m; /archives//html/RFI/2009-05/msg00028.html (9,520 bytes)
2. Re: [RFI] Alarm Systems and EMI/EMC (score: 1): Author: Michael Tope <W4EF@dellroy.com>; Date: Sat, 09 May 2009 22:24:11 -0700; Yes, the keyless entry on my wife's camaro gets blocked up on Mt. Wilson above Los Angeles where the big antenna farm is located (all manner of repeaters, paging transmitter, TV transmitters, FM radi; /archives//html/RFI/2009-05/msg00015.html (10,111 bytes)
3. Re: [RFI] Alarm Systems and EMI/EMC (score: 1): Author: Michael Tope <W4EF@dellroy.com>; Date: Sat, 09 May 2009 21:26:01 -0700; Hi Jim, The feedback I am getting suggests the wireless systems are superior to the wired systems in terms of EMI-EMC. This is not surprising since your are getting rid of long lengths of twisted pai; /archives//html/RFI/2009-05/msg00013.html (8,382 bytes)
4. [RFI] Alarm Systems and EMI/EMC (score: 1): Author: Michael Tope <W4EF@dellroy.com>; Date: Sat, 09 May 2009 12:28:05 -0700; Does anyone on the list have any experience with remote monitored home security systems and EMI/EMC? Looks like some of the new systems use wireless sensors. I am wondering what frequency these senso; /archives//html/RFI/2009-05/msg00008.html (6,752 bytes)
5. Re: [RFI] Fair Rite #31 Mix Material (score: 1): Author: Michael Tope <W4EF@dellroy.com>; Date: Tue, 13 Jan 2009 05:51:13 -0800; Hi Larry, Yes, I've also noticed the offset between the open/short location and the cal reference plane. I use primarly 2.4, 2.92, and 2.4mm standards in my work. I don't recall specifically checking; /archives//html/RFI/2009-01/msg00092.html (11,731 bytes)
6. Re: [RFI] Fair Rite #31 Mix Material (score: 1): Author: Michael Tope <W4EF@dellroy.com>; Date: Mon, 12 Jan 2009 08:49:09 -0800; Larry, If I did the math correct, your fixture (or the 0805 resistor) has about 0.5pf of stray C (based on the 30 MHz measurement). What are your calibration standards? 73, Mike W4EF.............. __; /archives//html/RFI/2009-01/msg00088.html (14,148 bytes)
7. Re: [RFI] IBM Plans Broadband Over Power Lines For Rural America (score: 1): Author: Michael Tope <W4EF@dellroy.com>; Date: Thu, 13 Nov 2008 17:51:53 -0800; I've seen this same argument used elswhere presumably to denigrate technology that is not in vogue as if HF transmitter technology hasn't advanced one iota since 1920 and nothing in a cellphone has a; /archives//html/RFI/2008-11/msg00024.html (8,907 bytes)
8. Re: [RFI] Gilding the outlet? (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Wed, 26 Dec 2007 13:57:21 -0800; LOL !! Talk about profit margin. I think this is proof that you don't necessarily have to be smart to be wealthy (there is hope for me yet). Happy Holidays, Mike W4EF........................ ________; /archives//html/RFI/2007-12/msg00057.html (7,412 bytes)
9. Re: [RFI] RFI From Ironman Inspire Treadmill (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Sun, 9 Sep 2007 10:21:27 -0700; Hi Tim, Type J should okay, so I suspect your choke is probably working. One kind of out of the box idea that occured to my last night was why not buy your own treadmill for purposes of debugging the; /archives//html/RFI/2007-09/msg00011.html (8,812 bytes)
10. Re: [RFI] RFI From Ironman Inspire Treadmill (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Wed, 5 Sep 2007 00:54:18 -0700; Tim, What is the material type (i.e. mix #77, #43) for the Amidon toroid you wrapped the power chord with? Mike, W4EF........................................................................ _________; /archives//html/RFI/2007-09/msg00009.html (8,273 bytes)
11. [RFI] SOLUTION - Keyboard Susceptibility (Sort of) (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Sat, 11 Aug 2007 18:41:18 -0700; I found a solution (or at least a clue to the solution) for my keyboard RFI problem. In my shop I found an old AT style keyboard laying in the corner (complete with the large AT style DIN connector).; /archives//html/RFI/2007-08/msg00029.html (8,653 bytes)
12. Re: [RFI] Keyboard RF Susceptibility (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Thu, 9 Aug 2007 15:27:38 -0700; Thanks to everyone who sent me suggestions. I did some more experiments and it looks like its direct radiation into the keyboard as opposed to common-mode action on the cable. With 8 or so turns of t; /archives//html/RFI/2007-08/msg00023.html (9,354 bytes)
13. [RFI] Keyboard RF Susceptibility (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Thu, 9 Aug 2007 11:08:39 -0700; I am trying to clean up a few problems at my station. Right now I can transmit on 160 meters at 1.5KW with the stereo turned and the TV's on and I get no hint of RF interference. The video display on; /archives//html/RFI/2007-08/msg00016.html (7,502 bytes)
14. Re: [RFI] I.C.E Limited (similiar to SSB Electronics thread) (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Mon, 2 Jul 2007 00:13:35 -0700; Terry, Check with Jay at Array Solutions. I think he distributes for products ICE (or at least he used to). 73, Mike W4EF.............................. _______________________________________________; /archives//html/RFI/2007-07/msg00004.html (8,109 bytes)
15. [RFI] LCD Monitors (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Sat, 23 Sep 2006 16:15:22 -0700; It's my understanding that LCD monitors are typically much much better than CRTs in terms of RFI emission. Is this pretty much universally true, or are the LCD flatpanels out there that are problemat; /archives//html/RFI/2006-09/msg00035.html (6,321 bytes)
16. Re: [RFI] Honda Generator RFI? (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Sun, 17 Sep 2006 05:31:54 -0700; I had the same problem with the EU-2000i, Bill. A KL7 I corresponded with suggested shielding the coil wire with a heavy tinned braid. This fixed the 160 meter noise problem completely: http://www.de; /archives//html/RFI/2006-09/msg00012.html (9,614 bytes)
17. [RFI] Fan Noise in 2001 Ford Ranger (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Mon, 3 Apr 2006 05:47:02 -0700; I have a 2001 Ford Ranger 4x4 pickup. The fan for the climate control system puts out quite a bit of electrical noise on MW/HF which I would like to clean-up. Near as I can tell, the fan is just a st; /archives//html/RFI/2006-04/msg00000.html (6,089 bytes)
18. Re: [RFI] [Amps] new mobile amps from THP (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Wed, 11 Jan 2006 07:22:01 -0800; Jim, The transmission in my 2001 Ford Ranger "crashes" occasionally even without RF stimulus. Fortunately, you can reboot the transmission by turning off the ignition and restarting the engine. Makes; /archives//html/RFI/2006-01/msg00044.html (8,293 bytes)
19. Re: [RFI] Can Fluorescent bulbs cause RFI problems? (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Mon, 26 Sep 2005 23:43:26 -0700; Scott, I live on a small lot, so all of my antennas are very close to the house. I have a number of compact fluorescents at very places in the house, I so far I haven't noticed them causing RFI on th; /archives//html/RFI/2005-09/msg00056.html (10,473 bytes)
20. Re: [RFI] BPL Propaganda, ARRL Rebuttal on NPR's Morning Edition (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Fri, 19 Aug 2005 19:25:02 -0700; Stuart is obviously a student of that circus guy :):) Mike, W4EF............................... -- Original Message -- From: "Jim P" <jvpoll@dallas.net> To: "Tom Rauch" <w8ji@contesting.com>; "Chuck; /archives//html/RFI/2005-08/msg00085.html (14,482 bytes)

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