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121. Re: Re: [RFI] 160 Meter Interference (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Wed, 6 Oct 2004 11:18:19 -0400; The 90kHz spacing and reasonably clean carrier is a dead giveaway. 90 kHz is in the most common range of low or medium power switching power supplies. The carrier was basically clean except for minor; /archives//html/RFI/2004-10/msg00015.html (9,577 bytes)
122. Re: Re: [RFI] 160 Meter Interference (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Wed, 6 Oct 2004 13:52:07 -0400; That is a good suggestion because on 160 or 80 things can be conducted a long distance along power lines, often for many miles. On low bands peaks and nulls caused by standing waves and other effects; /archives//html/RFI/2004-10/msg00020.html (8,923 bytes)
123. Re: [RFI] Ferrite Beads (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Mon, 18 Oct 2004 17:30:41 -0400; I'm confused about selecting the appropriate mix for beads for RFI suppression.>> I'm confused about most things in life. My gut is telling me (based on the above measurements) that the 43 mix is not; /archives//html/RFI/2004-10/msg00047.html (7,863 bytes)
124. Re: [RFI] Ferrite Beads (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Mon, 18 Oct 2004 19:49:14 -0400; can see that the availability of cores is going to be a problem. You cannot buy what is not available.>> I know DX Engineering is planning on stocking beads soon. Not just now though. Perhaps these c; /archives//html/RFI/2004-10/msg00049.html (7,880 bytes)
125. Re: [RFI] Ferrite Beads (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Mon, 18 Oct 2004 21:16:33 -0400; shorts the choke at 160 or 80 will I agree with that. http://www.w8ji.com/toroid_balun_winding.htm I'll have to redo that page someday with better pictures, and add some other beads. 1" 44 mix beads; /archives//html/RFI/2004-10/msg00052.html (8,798 bytes)
126. Re: [RFI] Ferrite Beads (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Tue, 19 Oct 2004 06:17:36 -0400; The question remains, what is the best material (among those available) and how many single turn toroid forms should I plan to incorporate to effectively suppress this noise? Maybe there is a better; /archives//html/RFI/2004-10/msg00059.html (9,528 bytes)
127. Re: [RFI] Ferrite Beads (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Tue, 19 Oct 2004 06:24:32 -0400; the COPs. grounding it? The most effective method is generally laying a THICK braided conductor along the wire, and wrapping the whole thing tightly with foil. This generally works best wrapped over; /archives//html/RFI/2004-10/msg00060.html (8,669 bytes)
128. Re: [RFI] Flat-screen TV emits international distress signal (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Tue, 19 Oct 2004 12:44:08 -0400; http://www.eham.net/articles/4285 I hope the FCC 's Powell reads the false distress signal and the above article. 73 Tom _______________________________________________ RFI mailing list RFI@contestin; /archives//html/RFI/2004-10/msg00065.html (8,797 bytes)
129. Re: [RFI] Re: Ferrite Beads (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Wed, 20 Oct 2004 05:39:41 -0400; transformers. These are swaps, or ask for a these days!). Ditch core. I know it's a common hint to use flyback or deflection cores, but if you measure impedance you'll find the available 43, 44 and; /archives//html/RFI/2004-10/msg00068.html (8,077 bytes)
130. Re: [RFI] Ferrite Beads (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Wed, 20 Oct 2004 22:42:08 -0400; otherwise perfectly good toroids if it is not going to work. How much RF resistance would be required to make a noticable difference? I'm not smart enough to know. Perhaps others on this list could p; /archives//html/RFI/2004-10/msg00072.html (8,862 bytes)
131. Re: [RFI] Ferrite Beads (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Fri, 22 Oct 2004 09:27:45 -0400; Ah the rub! Just exactly what job is it that I need done? Do I need 30 ohms? 60 ohms? 300 ohms? 3K ohms? What measurements do I need to make to determine what is needed? Just exactly what is it that; /archives//html/RFI/2004-10/msg00086.html (9,996 bytes)
132. Re: [RFI] RFI vs QRO? (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Fri, 22 Oct 2004 13:20:04 -0400; It's also where you keep the current. There are more than a few people who use antennas with improper feed systems. http://www.w8ji.com/end-fed_vertical_j-pole_and_horizontal_zepp.htm I have no RFI; /archives//html/RFI/2004-10/msg00090.html (7,574 bytes)
133. Re: [RFI] Ferrite Beads (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Fri, 22 Oct 2004 13:50:39 -0400; Hi Ford, One thing we ALL have to remember is typing doesn't convey our emotions or intentions very well. Engineers are generally accustomed to just saying things and being direct is often mistaken f; /archives//html/RFI/2004-10/msg00092.html (9,989 bytes)
134. Re: [RFI] RFI vs QRO? (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Fri, 22 Oct 2004 15:07:40 -0400; use, but with detected anything anywhere. Bullcrap. It would be nice if that was true, but it is really just plain nonsense. I watched a conversation and some comments from him on another reflector; /archives//html/RFI/2004-10/msg00097.html (8,297 bytes)
135. Re: [RFI] RFI vs QRO? (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Fri, 22 Oct 2004 16:06:22 -0400; We just tested a Generation One Main.net BPL system here with only 5 possible users on it. With no one actively using the system, the system is in idle mode and is indeed VERY QUIET. There's only a v; /archives//html/RFI/2004-10/msg00103.html (8,952 bytes)
136. Re: [RFI] RFI Services bullcrap smell test :) (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sun, 24 Oct 2004 18:57:02 -0400; experience. not, I can't control can assist. Mike, If people are leaving your talks with the impression that injecting power lines with small transmitters (BPL) can't and won't cause problems, maybe; /archives//html/RFI/2004-10/msg00108.html (9,297 bytes)
137. [RFI] Re: Final Re about bullcrap smell tests :) (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sun, 24 Oct 2004 20:07:44 -0400; the common No. Not at all. It means if your "experience" defies common readily available science, you better look again at what you think you saw. I deal with similar engineering problems all day, a; /archives//html/RFI/2004-10/msg00110.html (11,276 bytes)
138. Re: [RFI] Final Re about smell tests :) (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Mon, 25 Oct 2004 12:17:09 -0400; --Original Message-- From: rfi-bounces On Behalf Of Mike Martin Tom, I think what you mean is If I'm not going to agree with the common assumptions I shouldn't tell people about my experience. I thin; /archives//html/RFI/2004-10/msg00120.html (9,308 bytes)
139. Re: [RFI] RF Impedance measurement (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Mon, 25 Oct 2004 14:28:12 -0400; capable and my MFJ I have had a experience would be IMO, since I have both, the MFJ 259 is better when it is calibrated correctly. I know they went for at least a few years calibrating incorrectly b; /archives//html/RFI/2004-10/msg00122.html (8,091 bytes)
140. Re: [RFI] NOISE GADGETS (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Wed, 10 Nov 2004 13:56:14 -0500; mode effects at twisted pairs for wire IS made of person on the other prevent the coupling ....and nearly all telco RF problems I've found are from common mode, NOT differential mode, problems. That; /archives//html/RFI/2004-11/msg00021.html (8,527 bytes)

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