- 41. Re: [RFI] TV cable splitters (score: 1)
- Author: "Michael Tope" <W4EF@dellroy.com>
- Date: Tue, 1 Feb 2005 22:44:06 -0800
- Loss (over and above the 3dB splitting loss) for a good CATV 2-way power divider (e.g. one that costs $0.50 to manufacture) is 0.3 to 0.4dB in the low VHF range increasing to about 1.2 dB at 1 GHz. P
- /archives//html/RFI/2005-02/msg00004.html (9,013 bytes)
- 42. Re: [RFI] TV cable splitters (score: 1)
- Author: "Michael Tope" <W4EF@dellroy.com>
- Date: Thu, 3 Feb 2005 09:30:50 -0800
- Not neccessarily, Bill. F connectors are typically very low loss provided that a good match is maintained. In fact in many cases they will work well to beyond 2 GHz. The limiting factor is typically
- /archives//html/RFI/2005-02/msg00007.html (9,575 bytes)
- 43. Re: [RFI] HF Mobile Installation in 2001 Mazda (score: 1)
- Author: "Michael Tope" <W4EF@dellroy.com>
- Date: Sat, 5 Feb 2005 09:04:31 -0800
- If you look at the ARRL RFI Handbook, it excerpts 2-way radio install recommendations from the big 3 automakers. They all suggest running a negative lead back to the battery, but they disagree about
- /archives//html/RFI/2005-02/msg00022.html (11,691 bytes)
- 44. Re: [RFI] Honda Generator RFI (score: 1)
- Author: "Michael Tope" <W4EF@dellroy.com>
- Date: Tue, 22 Mar 2005 21:54:20 -0800
- Hi Clay, We use a Honda ES6500 at our Field Day site without any special line filtering and don't have any problems with noise. That is not to say that it doesn't generate any RFI. My experience has
- /archives//html/RFI/2005-03/msg00065.html (10,683 bytes)
- 45. Re: [RFI] Honda Generator RFI (score: 1)
- Author: "Michael Tope" <W4EF@dellroy.com>
- Date: Wed, 23 Mar 2005 23:42:04 -0800
- I respectfully disagree with your statement, Bill. When I was trying to solve the RFI problems with my Honda EU2000i, I tried using a B&W AC line filter that I had lying around the shack. It did abso
- /archives//html/RFI/2005-03/msg00093.html (11,207 bytes)
- 46. Re: [RFI] Honda Generator RFI (score: 1)
- Author: "Michael Tope" <W4EF@dellroy.com>
- Date: Thu, 24 Mar 2005 00:06:39 -0800
- Type 73 appears to be a good choice for HF, but I don't think Fair-Rite Products produces it in toroid form. I think it's only available in bead form or binocular cores. I just measured an ~12" long
- /archives//html/RFI/2005-03/msg00096.html (8,945 bytes)
- 47. Re: [RFI] Honda Generator RFI (score: 1)
- Author: "Michael Tope" <W4EF@dellroy.com>
- Date: Thu, 24 Mar 2005 22:14:17 -0800
- I looked at the output of my EU2000i on a 100 MHz scope and it looked like a pretty darn clean sine wave. RMS voltage regulation is very good - probably better than the 120 V outlets in my shack. I h
- /archives//html/RFI/2005-03/msg00104.html (12,296 bytes)
- 48. Re: [RFI] Honda Generator RFI (score: 1)
- Author: "Michael Tope" <W4EF@dellroy.com>
- Date: Tue, 29 Mar 2005 20:45:59 -0800
- Clay, I am curious, when you ran your rig from the battery and still had high noise levels, were you in any way still connected to the generator (say via the AC line safety ground for instance, or an
- /archives//html/RFI/2005-03/msg00111.html (10,215 bytes)
- 49. Re: [RFI] APC BR1500 UPS RFI on 3.5 MHz (score: 1)
- Author: "Michael Tope" <W4EF@dellroy.com>
- Date: Sun, 10 Apr 2005 13:47:41 -0700
- Stephanie, I had very strong spurs on 160 meters (S9 +20 spaced ~15 KHz) from my Belkin 1400VA unit. I didn't put 2 and 2 together until I had it on the bench in the garage a few months ago to replac
- /archives//html/RFI/2005-04/msg00003.html (8,489 bytes)
- 50. Re: [RFI] apc ups (score: 1)
- Author: "Michael Tope" <W4EF@dellroy.com>
- Date: Mon, 11 Apr 2005 12:59:46 -0700
- What you describe Leonard is similar to what my UPS does. Presumeably what you are seeing when the interference changes frequency is the operating frequency of the switchmode power supply inside the
- /archives//html/RFI/2005-04/msg00006.html (7,432 bytes)
- 51. Re: [RFI] BPL Propaganda, ARRL Rebuttal on NPR's Morning Edition (score: 1)
- Author: "Michael Tope" <W4EF@dellroy.com>
- Date: Fri, 19 Aug 2005 07:27:14 -0700
- If what you says is true, Ed, then our only real hope is that Motorola system with its hard analog notch filters beomces the widely adopted standard. BTW, have there been any actual ARRL attended dem
- /archives//html/RFI/2005-08/msg00081.html (10,890 bytes)
- 52. 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)
- 53. 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)
- 54. 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)
- 55. [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)
- 56. 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)
- 57. [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)
- 58. 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)
- 59. [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)
- 60. 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)
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