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Total 79 documents matching your query.

61. [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)

62. 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)

63. 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)

64. 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)

65. 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)

66. 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)

67. 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)

68. [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)

69. 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)

70. 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)

71. 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)

72. Re: [RFI] Bad QRN on HF (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Sat, 14 Aug 2010 23:40:25 -0700
Hi Dana, If you haven't already done so, you might try using Spectran: http://www.sdrham.com/ It provides a waterfall display and recording capability. The waterfall can help determine if there are a
/archives//html/RFI/2010-08/msg00017.html (9,577 bytes)

73. Re: [RFI] Bad QRN on HF (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Tue, 17 Aug 2010 17:58:27 -0700
That sounds better, Dana. Much less distortion in the recording. I wish I could identify the source. I think your best bet right now is to make some additional observations of when the noise starts a
/archives//html/RFI/2010-08/msg00044.html (12,178 bytes)

74. [RFI] IR Illuminator for Security Cameras (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Sun, 30 Jan 2022 10:55:29 -0800
I have a couple of south facing security cameras that I  have tucked under the soffits of my high desert cabin so they don't get baked by the high desert sun. The tradeoff for this is that I am getti
/archives//html/RFI/2022-01/msg00064.html (7,729 bytes)

75. Re: [RFI] IR Illuminator for Security Cameras (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Sun, 30 Jan 2022 11:53:12 -0800
Thank you, Dave. Yeah, I understand that this warning is somewhat perfunctory, but it was so prominently displayed in the manual and a friend was just complaining about RFI from LED lights. Those two
/archives//html/RFI/2022-01/msg00067.html (11,885 bytes)

76. Re: [RFI] IR Illuminator for Security Cameras (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Tue, 1 Feb 2022 01:28:05 -0800
Yeah, I am probably overdue to put my HF rig on a car battery and kill the AC mains  to see what I am inflicting on myself. The wall warts in my shack seem to be multiplying like rabbits. Likewise, g
/archives//html/RFI/2022-02/msg00005.html (9,084 bytes)

77. [RFI] Bestek True Sine Inverters (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Fri, 11 Mar 2022 02:37:06 -0800
Does anyone have any experience with "Bestek" pure sine inverters? I am looking for a convenient source of AC power to keep in my truck for running small power tools when doing antenna working at loc
/archives//html/RFI/2022-03/msg00003.html (6,868 bytes)

78. Re: [RFI] AM Radio Dropped From Electric Vehicles Due To RFI (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Sat, 30 Jul 2022 16:25:36 -0700
I bought a Toyota RAV4 PHEV recently. Today I tried out the AM radio in electric-only mode while driving on the I-210 Freeway through Pasadena, Ca. The reception was surprising good. I could hear som
/archives//html/RFI/2022-07/msg00080.html (9,394 bytes)

79. Re: [RFI] Inquiry - AFCI RFI? (score: 1)
Author: Michael Tope <W4EF@dellroy.com>
Date: Thu, 16 Mar 2023 23:12:28 -0700
I thought I read recently that Eaton AFCIs were sensitive to RFI, but that they made an RF immune AFCI that you could order from the factory. I am interested in this topic because I am having my anci
/archives//html/RFI/2023-03/msg00021.html (9,153 bytes)

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