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21. Re: [RFI] Fair Rite #31 Mix Material (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 11 Jan 2009 22:53:52 -0500
Interesting info Larry. Much appreciated. exactly at the same size and performance category as the Fair-Rite P/N 2631480102 which has a half-inch depth on a #31 core. Paul, W9AC ____________________
/archives//html/RFI/2009-01/msg00077.html (8,270 bytes)

22. Re: [RFI] Fair Rite #31 Mix Material (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 11 Jan 2009 23:02:11 -0500
My pursuit of the smaller thickness core is related to size and space considerations of the current application. I think I can get by with the 0.5" thickness core from Fair-Rite -- or stack a pair o
/archives//html/RFI/2009-01/msg00078.html (9,433 bytes)

23. Re: [RFI] Fair Rite #31 Mix Material (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 11 Jan 2009 23:23:44 -0500
Sure does, as always Jim! Paul, W9AC _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listinfo/rfi
/archives//html/RFI/2009-01/msg00082.html (8,433 bytes)

24. Re: [RFI] Fair Rite #31 Mix Material (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 12 Jan 2009 06:06:08 -0500
Jim, One point of confusion is the type of winding employed with a CM choke. I have always wound mine in bifilar fashion. On some occasions, I have even twisted a pair (winding about 6 turns/inch usi
/archives//html/RFI/2009-01/msg00086.html (9,777 bytes)

25. Re: [RFI] Line Noise Spectragraph (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 21 Jan 2009 12:23:25 -0500
Problem finally solved after a couple months of working with what had been a less than compliant neighbor (See photo of the noise source in the link from my prior message below). After trying unsucce
/archives//html/RFI/2009-01/msg00157.html (10,084 bytes)

26. Re: [RFI] Dimmer Switch Help (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 13 Mar 2009 20:32:43 -0400
My own tests indicate that the Lutron dimmers produce far less RFI than those made by Leviton. I recently installed a Leviton dimmer that was boldly branded as having an RFI filter. But on 160m-80m,
/archives//html/RFI/2009-03/msg00055.html (12,204 bytes)

27. Re: [RFI] DX Engineering Choke question... (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 14 Apr 2009 16:43:33 -0400
Myself, I am hoping one day that K9YC will present measured choking data for the most popular commercially-manufactured baluns including Balun Designs, ArraySolutions, and DXE. That would be extremel
/archives//html/RFI/2009-04/msg00036.html (14,916 bytes)

28. Re: [RFI] DX Engineering Choke question... (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 14 Apr 2009 16:51:28 -0400
Photos and the orientation of the isolated side is mentioned in the DXE product literature and can be found here: http://www.dxengineering.com/pdf/FCCA.pdf Paul, W9AC _______________________________
/archives//html/RFI/2009-04/msg00038.html (6,909 bytes)

29. Re: [RFI] Mast-mount TV Pre-Amp -- Avoiding RFI & Overload? (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 4 Jun 2009 07:33:18 -0400
Excellent suggestion, Jim. Microwave Filters, Inc. produces such a filter with a HPF function and can be ordered with a knee at the lower edge of Ch. 7. Their model 3378 would work well between the
/archives//html/RFI/2009-06/msg00007.html (12,281 bytes)

30. Re: [RFI] TVI filters (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 29 Jun 2009 14:01:57 -0400
As a former Director of Engineering for Comcast, the most prevalent form of ingress occurs through loose F-connectors, most of which are properly crimped. That, followed by improperly-crimped connec
/archives//html/RFI/2009-06/msg00068.html (8,281 bytes)

31. Re: [RFI] TVI filters (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 29 Jun 2009 15:08:09 -0400
That's an unauthorized company procedure for any RF connection -- even for a set-top-box to television set connection. At times, cable technical services are outsourced to a contractor who run out o
/archives//html/RFI/2009-06/msg00070.html (8,222 bytes)

32. Re: [RFI] CATV Upstream Interference (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 27 Aug 2009 12:35:59 -0400
Oftentimes, if the cable is leaking in the upstream, its also leaking in the downstream. Depending on his country's standardized CATV spectrum, there may be an analog channel mapped close to our Ch.
/archives//html/RFI/2009-08/msg00030.html (7,532 bytes)

33. Re: [RFI] Any Issues with newer heating cooling systems (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 28 Aug 2009 12:44:19 -0400
And the worst part? When these devices are used in "appliances," the entire appliance is exempt from certification and is also "exempt from the specific technical standards and other requirements...
/archives//html/RFI/2009-08/msg00037.html (8,897 bytes)

34. [RFI] Washer RFI/EMI (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 6 Sep 2009 15:14:27 -0400
Looks like this series of Corcom filter may be worth trying on a washer with a VFD motor. http://www.cor.com/pdf/FC.pdf I just ordered one for my GE Harmony Profile-series washer. It's now out of war
/archives//html/RFI/2009-09/msg00019.html (6,912 bytes)

35. Re: [RFI] Washer RFI/EMI (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 7 Sep 2009 08:21:14 -0400
My thought is to isolate any existing cabinet shielding from the RFI abatement. This would include using large #31 toroids on the VFD cabling close to the motor connect point, and also close to the
/archives//html/RFI/2009-09/msg00025.html (9,475 bytes)

36. Re: [RFI] 160m-5mhz noise? (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 5 Nov 2009 21:27:05 -0500
I had a similar issue last year. The root cause was an imported "micro fridge" being used in a home about 200 ft away from me. It emitted a very broad level of noise that raised the noise floor on a
/archives//html/RFI/2009-11/msg00002.html (10,831 bytes)

37. Re: [RFI] 160m-5mhz noise? (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 6 Nov 2009 06:18:16 -0500
Charlie, The problem is not pervasive with legitimate companies like Astron, Samlex and scores of other switch-mode producing technology companies. To a large extent, the problem comes from off-shor
/archives//html/RFI/2009-11/msg00006.html (8,628 bytes)

38. Re: [RFI] 160m-5mhz noise? (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 8 Nov 2009 13:08:02 -0500
While a switch-mode supply can be made as quiet as a linear supply, oftentimes they are not. The quality power supply brands are generally not a problem. The problem more often is from an Asian impo
/archives//html/RFI/2009-11/msg00013.html (9,339 bytes)

39. Re: [RFI] RFI alert (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 6 Dec 2009 11:08:00 -0500
Progress in this area is slow but I'm pleased to see solutions like this. Over the weekend, I replaced my home office's under-counter halogen lighting with a variant that does not use a switched "ele
/archives//html/RFI/2009-12/msg00020.html (18,901 bytes)

40. Re: [RFI] New switching wallwarts - RFI potential? (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 12 Jan 2010 11:22:26 -0500
That's a new one on me. I had not heard of RFI/EMI generated by PN junction switching in linear-mode power supplies. In reading through Dallas Lankford's description, I was initially certain he was
/archives//html/RFI/2010-01/msg00043.html (11,342 bytes)

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