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1. [RFI] Computer RFI problem (score: 1)
Author: (Cortland Richmond)
Date: Thu, 8 Aug 2002 11:9:33 -0700
Check out the drawing at Did you keep the "radials" away from the coax" Coupling from the coax to that point can couple noise on the coax int
/archives//html/RFI/2003-08/msg00005.html (6,794 bytes)

2. [RFI] Homeplug (score: 1)
Author: (Cortland Richmond)
Date: Mon, 25 Mar 2002 13:3:8 -0800
Dale, Thanks for the links. One very important issue for us as individual Hams is that no matter how well suppressed Part 15 devices are for emissions, they can be highly susceptible to RF we generat
/archives//html/RFI/2003-08/msg00006.html (8,106 bytes)

3. [RFI] Re: alarm system RFI (score: 1)
Author: (Cortland Richmond)
Date: Mon, 4 Nov 2002 20:1:30 -0800
Marc, At this point, it strikes me you need a different alarm company! Do you have a local ARRL RFI technical volunteer? You would do well to bring them aboard, if for no other reason than to furnish
/archives//html/RFI/2003-08/msg00007.html (7,651 bytes)

4. [RFI] Speedstream DSL modem (score: 1)
Author: (Cortland Richmond)
Date: Fri, 3 Jan 2003 10:48:6 -0800
I worked on RFI and EMC problems associated with DSL, both CAP/RADSL and DMT. The telco portion has mandatory immunity testing (under Telcordia GR-1089 and telco addenda to that) so is pretty good. B
/archives//html/RFI/2003-01/msg00002.html (7,073 bytes)

5. [RFI] s7-s9 noise (score: 1)
Author: (Cortland Richmond)
Date: Tue, 14 Jan 2003 9:10:17 -0800
I spent five years in telecom EMC design and testing recently; that "ground" is merely a return path for induced currents. House protectors need a good LOCAL ground. How good? Using the GR-1089 surge
/archives//html/RFI/2003-01/msg00021.html (7,679 bytes)

6. [RFI] Common Mode RFI (score: 1)
Author: (Cortland Richmond)
Date: Thu, 5 Dec 2002 2:53:5 -0800
re Snap-on ferrites as common-mode tester, I've been using this for some years. Ad hoc test equipment. Great minds must think alike (heh). However, they don't replace a Solar or Eaton (or the like) s
/archives//html/RFI/2002-12/msg00028.html (7,222 bytes)

7. [RFI] Automotive RFI elmer wanted (score: 1)
Author: (Cortland Richmond)
Date: Thu, 5 Dec 2002 19:39:57 -0800
Jim, I'm in the North Bay; let me know where you are and we could get together. Maybe if it interferes with a DIFFERENT mobile it'd be "harmful interference" they'd have to fix (grin). Cortland might
/archives//html/RFI/2002-12/msg00031.html (6,856 bytes)

8. [RFI] PLC in the USA (score: 1)
Author: (Cortland Richmond)
Date: Sat, 5 Oct 2002 17:56:59 -0700
Current Technologies is deploying a PLC system "that can transform an electric distribution network into a broadband communications platform. " Utilities mentioned are Pepco and Cinergy, in Maryland
/archives//html/RFI/2002-10/msg00001.html (6,440 bytes)

9. [RFI] No Complaints, No Problem! (score: 1)
Author: (Cortland Richmond)
Date: Mon, 21 Oct 2002 9:21:27 -0700
I think that in these situations it is important to file an FCC complaint, including a copy of our correspondence or a summary of telephone calls, etc. The Commission _officially_ recognizes no probl
/archives//html/RFI/2002-10/msg00030.html (7,340 bytes)

10. [RFI] No Complaints, No Problem! (score: 1)
Author: (Cortland Richmond)
Date: Mon, 21 Oct 2002 10:54:57 -0700
I'm not going to dispute what Eddie says about the good TVI complaints do -- or don't do. They're often futile. The Commission isn't staffed as it was twenty years ago and interference complaints cou
/archives//html/RFI/2002-10/msg00033.html (8,639 bytes)

11. [RFI] Modern receivers not part of the problem (score: 1)
Author: (Cortland Richmond)
Date: Mon, 21 Oct 2002 11:33:25 -0700
This is one thing that's gotten better. The IC-701 and IC-720 receivers were not better than what we now buy, and a good thing, too. Receivers have improved a LOT since the first PLL synthesized, "Ge
/archives//html/RFI/2002-10/msg00034.html (7,206 bytes)

12. [RFI] RFI and Speed Stream 5667 DSL Modem (score: 1)
Author: (Cortland Richmond)
Date: Mon, 9 Sep 2002 14:18:30 -0700
I worked with an ADSL modem a couple of years ago that had problems with RF noise on the power line. This responded well to added common-mode filtering at the power input. But I also had to float the
/archives//html/RFI/2002-09/msg00007.html (7,484 bytes)

13. [RFI] LED Traffic Light RFI (score: 1)
Author: (Cortland Richmond)
Date: Fri, 27 Sep 2002 12:33:34 -0700
Bill, I think I remember this subject being discussed in another venue, possibly on YahooGroups. In that case, if I recall correctly, the noise was evidently coming from a switching power supply prov
/archives//html/RFI/2002-09/msg00016.html (8,118 bytes)

14. [RFI] RE: feeder coupling (was Computer RFI problem) (score: 1)
Author: (Cortland Richmond)
Date: Wed, 7 Aug 2002 14:19:46 -0700
Sounds to me as if folks are talking past each other here. We run a dipole feed off at right angles to the antenna to minimize RF on its shield. Each half of the dipole induces a current on the shiel
/archives//html/RFI/2002-08/msg00019.html (7,104 bytes)

15. [RFI] Computer RFI problem (score: 1)
Author: (Cortland Richmond)
Date: Wed, 7 Aug 2002 15:12:14 -0700
Now, that IS interesting! Does NEC tell us that there isn't an end-null in an end-fed half-wave's's near field? Is the coupling purely capacitive to the adjacent feedline conductor? Cortland
/archives//html/RFI/2002-08/msg00021.html (9,533 bytes)

16. [RFI] Computer RFI problem (score: 1)
Author: (Cortland Richmond)
Date: Thu, 8 Aug 2002 10:47:49 -0700
We can account for common-mode current here without recourse to induced fields. We must provide a relatively low impedance for the matching circuit return. There could be perhaps 20 volts on this ret
/archives//html/RFI/2002-08/msg00023.html (8,648 bytes)

17. [Towertalk] RE: [RFI] Choke Balun on RG-59 Coax? (score: 1)
Author: "Cortland Richmond" <>
Date: Mon, 24 Jun 2002 11:26:37 -0700
Eric, I don't know what permeability your beads have. Normally used "EMI" beads run around 850, with 100 to 200 ohms added impedance (each)**at 100 MHz**. You can expect them to have very little effe
/archives//html/RFI/2002-06/msg00001.html (8,566 bytes)

18. [RFI] RFI from 12 volt refrigeration (score: 1)
Author: (Cortland Richmond)
Date: Tue, 4 Jun 2002 12:23:32 -0700
I suggest that you install a robust common-mode RFI filter as close to the compressor as practical, to keep noise out of your vessel's power wiring. Any number of pre-packaged powerline filters are s
/archives//html/RFI/2002-06/msg00016.html (9,243 bytes)

19. [RFI] EMC "Testing" with HT's (score: 1)
Author: (Cortland Richmond)
Date: Fri, 7 Jun 2002 15:39:18 -0700
... communications technology. In addition, a standard on testing immunity of electronics devices is nearing final approval. Hare is on a subcommittee studying ways to use hand-held transmitters to
/archives//html/RFI/2002-06/msg00017.html (6,596 bytes)

20. : [RFI] AFCI (score: 1)
Author: (Cortland Richmond)
Date: Mon, 1 Apr 2002 8:21:12 -0800
Preventive suggestions (required to be included as a user aid) do NOT relieve device manufacturers of their obligation to users that proper operation not cause harmful interference. Most states have
/archives//html/RFI/2002-04/msg00004.html (7,735 bytes)

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