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21. [RFI] CO Detector (score: 1): Author: Roger Parsons <ve3zi@yahoo.com>; Date: Fri, 16 Feb 2007 01:35:07 +0000 (GMT); I appreciate the various comments received directly and through the reflector. It appears that the Kidde CO monitors affected by VE3WO's transmission are all of the kind that are linked together. I c; /archives//html/RFI/2007-02/msg00044.html (7,867 bytes)
22. Re: [RFI] Noise is everywhere (was Solar Arrays) (score: 1): Author: Roger Parsons <ve3zi@yahoo.com>; Date: Thu, 10 May 2007 22:16:57 +0100 (BST); Laissez faire economics are alright in principle, but in practice a great many things need to be regulated. There are just too many unscrupulous or ill informed people and organisations for it to be; /archives//html/RFI/2007-05/msg00011.html (8,080 bytes)
23. Re: [RFI] Non-transmitting tower causes RFI/EMI? (score: 1): Author: Roger Parsons <ve3zi@yahoo.com>; Date: Wed, 14 Nov 2007 15:35:57 +0000 (GMT); VE3WO and I went through a similar situation with Kidde CO detectors last year, where very low levels of RF on the low bands were triggering them. We resolved it in conjunction with two very cooperat; /archives//html/RFI/2007-11/msg00057.html (9,439 bytes)
24. [RFI] PC Power Supply Noise (score: 1): Author: Roger Parsons <ve3zi@yahoo.com>; Date: Wed, 26 Dec 2007 16:17:49 +0000 (GMT); This will probably not be news to anyone, but may just be useful. Just about every desktop PC creates lots of rf birdies and other nasties. Some comes from the monitor/video card, but in my experienc; /archives//html/RFI/2007-12/msg00055.html (7,664 bytes)
25. Re: [RFI] PC Power Supply Noise (score: 1): Author: Roger Parsons <ve3zi@yahoo.com>; Date: Fri, 28 Dec 2007 03:08:18 +0000 (GMT); I knew I was re-inventing the wheel, but perhaps a nine year gap is long enough for it to be worth repeating! Thanks for the comments guys. 73 Roger VE3ZI ____________________________________________; /archives//html/RFI/2007-12/msg00067.html (7,337 bytes)
26. Re: [RFI] AC Line filters (score: 1): Author: Roger Parsons <ve3zi@yahoo.com>; Date: Fri, 4 Apr 2008 14:36:18 +0100 (BST); I 'roll my own' in nearly every case. AC line filters are the exception: These devices are directly connected to the AC line and therefore need to be approved devices - that really means UL/CSA/CE ap; /archives//html/RFI/2008-04/msg00015.html (7,701 bytes)
27. [RFI] Zoom X6 DSL Modem loses internet connection (score: 1): Author: Roger Parsons <ve3zi@yahoo.com>; Date: Fri, 13 Feb 2009 16:59:40 -0800 (PST); I finally got DSL out in the sticks here a couple of weeks ago, and of course more than 100W killed my modem too. Winding the phone line round a toroid helped a bit but not enough - the reasons for t; /archives//html/RFI/2009-02/msg00092.html (7,515 bytes)
28. [RFI] DSL interference (score: 1): Author: Roger Parsons <ve3zi@yahoo.com>; Date: Fri, 20 Feb 2009 16:34:47 -0800 (PST); Last week I posted a description of a DSL filter which completely cured my DSL interference problem at the cost of a few cheap components and an hour or so of construction time. It makes no differenc; /archives//html/RFI/2009-02/msg00104.html (7,034 bytes)
29. [RFI] DSL Filter Update (score: 1): Author: Roger Parsons <ve3zi@yahoo.com>; Date: Sat, 7 Mar 2009 11:29:05 -0800 (PST); Just to advise the group that a couple of other stations have had success with this filter. Nick, VE3FJ, also checked out its frequency response with the following results: 1.85MHz -26dB 3.65MHz -46d; /archives//html/RFI/2009-03/msg00006.html (7,339 bytes)
30. Re: [RFI] DSL Filter Update (score: 1): Author: Roger Parsons <ve3zi@yahoo.com>; Date: Sat, 7 Mar 2009 12:01:26 -0800 (PST); I know that Nick used an N2PK VNA - .png attached - but no more than that. I did do a few sums on the filter design a few weeks ago and was surprised to find that the design impedance is close to 50; /archives//html/RFI/2009-03/msg00008.html (8,738 bytes)
31. Re: [RFI] DSL Filter Update (score: 1): Author: Roger Parsons <ve3zi@yahoo.com>; Date: Sat, 7 Mar 2009 21:11:39 -0800 (PST); I stand corrected about feed/load impedance and measurement of filter response. I should have said 'If the feed and load impedances are purely resistive and reasonably close to the filter design impe; /archives//html/RFI/2009-03/msg00015.html (8,403 bytes)
32. Re: [RFI] DSL Filter Update (score: 1): Author: Roger Parsons <ve3zi@yahoo.com>; Date: Sun, 8 Mar 2009 17:46:37 -0700 (PDT); I think I have already covered that in several postings. Of course the filter is a considerable compromise in a number of respects, but a cut-off of 3MHz would not protect against a 160m transmitter; /archives//html/RFI/2009-03/msg00018.html (10,078 bytes)
33. Re: [RFI] DSL Filter Update (score: 1): Author: Roger Parsons <ve3zi@yahoo.com>; Date: Sun, 8 Mar 2009 19:55:43 -0700 (PDT); "You're looking at the elephant through a differential-mode hole in the tent." Not at all. I am very well aware that there are many ways to kill a cat, but this thread started where common mode choki; /archives//html/RFI/2009-03/msg00022.html (8,225 bytes)
34. Re: [RFI] 160m-5mhz noise (score: 1): Author: Roger Parsons <ve3zi@yahoo.com>; Date: Fri, 6 Nov 2009 04:57:42 -0800 (PST); and this is legal how? -- GB & 73 K5OAI Sam Morgan Quite simple. The best known and respected EMC compliance standard is CE marking - which is European. So marking something 'CE' in North America is; /archives//html/RFI/2009-11/msg00008.html (6,992 bytes)
35. Re: [RFI] Link-coupled loop - more (score: 1): Author: Roger Parsons <ve3zi@yahoo.com>; Date: Tue, 1 Apr 2014 17:57:04 -0700 (PDT); I used to take part in 160m DF contests in a previous existence. Lots of tricks were used to make the competitions more difficult, and one of the favourite ones was to place the hidden stations very; /archives//html/RFI/2014-04/msg00009.html (8,279 bytes)
36. Re: [RFI] Link-coupled loop - more (score: 1): Author: Roger Parsons <ve3zi@yahoo.com>; Date: Wed, 2 Apr 2014 17:07:03 -0700 (PDT); A couple of points: The sense circuit does not need a goniometer in its simple form. All you need is a whip antenna physically pretty much in the same place as the loop. A vertical whip is omnidirect; /archives//html/RFI/2014-04/msg00032.html (10,472 bytes)
37. Re: [RFI] Link-coupled loop - more (score: 1): Author: Roger Parsons <ve3zi@yahoo.com>; Date: Thu, 3 Apr 2014 06:50:28 -0700 (PDT); Larry: There is no magic sense circuit design of which I am aware. My first DF receiver used a DF96 1.5V filament valve as the sense amplifier. My next used a germanium transistor which worked fine u; /archives//html/RFI/2014-04/msg00041.html (8,645 bytes)

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