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1. [RFI] Shielding N4ZR (score: 1): Author: Palomar@compuserve.com (Palomar Engineers); Date: Thu, 7 Nov 2002 11:39:20 -0500; The January 20, 1994 issue of EDN magazine had a great tutorial by Daryl Gerke & Bill Kimmel -- EDN might have reprints or those two may have a book. They answered all your questions. -- Jack, K6NY,; /archives//html/RFI/2002-11/msg00018.html (6,681 bytes)
2. [RFI] Subwoofer does CW (score: 1): Author: Palomar@compuserve.com (Palomar Engineers); Date: Sat, 23 Nov 2002 22:48:14 -0500; I take it that the subwoofers have their own active amplifiers. I'd get some Palomar 3/4" split beads. Put them on both power cords and on both signal leads right at the subwoofers. You can wrap 3 to; /archives//html/RFI/2002-11/msg00035.html (6,674 bytes)
3. [RFI] TV Cable & TVI - PY4RO (score: 1): Author: Palomar@compuserve.com (Palomar Engineers); Date: Tue, 24 Sep 2002 22:49:52 -0400; If you have a balun on the beam or put ferrite cores over the cable at the antenna you should have no trouble due to routing of the cable. Your TVI problems are far more likely to come from the RF le; /archives//html/RFI/2002-09/msg00013.html (6,540 bytes)
4. [RFI] Broad band Cable Modem (score: 1): Author: Palomar@compuserve.com (Palomar Engineers); Date: Sun, 2 Jun 2002 22:27:02 -0400; Try adding ferrites to the power supply DC line or on the AC line in addition to the filter. (The filter helped so more is even better) Also ferrite over the cable in case the outer shield is carryin; /archives//html/RFI/2002-06/msg00007.html (6,851 bytes)
5. [RFI] Choke baluns on RG-59 (score: 1): Author: Palomar@compuserve.com (Palomar Engineers); Date: Mon, 24 Jun 2002 19:05:03 -0400; We use 10 of our FB-56-43 beads on RG-59 for 160 meters. The total bead impedance on 160 meters is 300 ohms, twice that on 80 meters. -- Commercial: Palomar has kits for this that include beads and s; /archives//html/RFI/2002-06/msg00022.html (6,252 bytes)
6. [RFI] Toroid color codes (score: 1): Author: Palomar@compuserve.com (Palomar Engineers); Date: Mon, 6 May 2002 10:41:15 -0400; There is no standard color code for toroids. Each manufacturer does it his way. The color codes for iron powder cores shown in the ARRL handbook are for cores made by Micrometals. These are readily a; /archives//html/RFI/2002-05/msg00004.html (6,939 bytes)
7. [RFI] AC Line data RFI (score: 1): Author: Palomar@compuserve.com (Palomar Engineers); Date: Tue, 16 Apr 2002 22:54:00 -0400; Try placing a FSB-1/4 on the radio's line cord. If that doesn't get rid of it try about 5 turns of the line cord on a F140-77 toroid. Unless there is radiation directly into the radio's loop antenna; /archives//html/RFI/2002-04/msg00012.html (6,404 bytes)
8. [RFI] 1987 Nissan fuel pump (score: 1): Author: Palomar@compuserve.com (Palomar Engineers); Date: Sun, 3 Feb 2002 12:38:07 -0500; Some of our customers have had success putting ferrites over the fuel pump wires on other cars & trucks. . All 5 wires through one ferrite bead close to the pump. Easy to use three FSB-1/4 if cable n; /archives//html/RFI/2002-02/msg00003.html (6,355 bytes)
9. [RFI] Noise sniffer article in QST - WW3S (score: 1): Author: Palomar@compuserve.com (Palomar Engineers); Date: Wed, 23 Jan 2002 22:58:33 -0500; /archives//html/RFI/2002-01/msg00006.html (7,139 bytes)
10. [RFI] Nutone Intercom RFI (score: 1): Author: Palomar@compuserve.com (Palomar Engineers); Date: Fri, 7 Dec 2001 21:19:27 -0500; If the doorbell switch is just a mechanical switch the RFI will not affect it. More likely is the active circuits in the main electronics box. Try placing the ferrites and, if needed, the capacitor a; /archives//html/RFI/2001-12/msg00018.html (6,779 bytes)
11. [RFI] Nutone Intercom RFI (score: 1): Author: Palomar@compuserve.com (Palomar Engineers); Date: Sat, 8 Dec 2001 14:42:16 -0500; Yes, both leads through a toroid gives higher inductance than individual beads. Use largest core in RFI kit and 5-10 turns. If you can measure the power level needed to cause the problem then you can; /archives//html/RFI/2001-12/msg00022.html (7,005 bytes)
12. [RFI] Interfacing to sound card RFI (score: 1): Author: Palomar@compuserve.com (Palomar Engineers); Date: Tue, 20 Nov 2001 18:17:13 -0500; One possibility is too many turns on the -77 toroids. Capacitance across winding can leak the signal. For 20 meters try 5 turns closewound. Keep winding ends apart. Worth a try anyway -- Jack, K6NY,; /archives//html/RFI/2001-11/msg00018.html (6,744 bytes)
13. [RFI] Interfacing to sound card RFI (score: 1): Author: Palomar@compuserve.com (Palomar Engineers); Date: Mon, 26 Nov 2001 22:49:02 -0500; Ed, K0IL is correct. Turns should be spaced, not close wound. However, be sure that beginning and end of winding are separated by about 1/5 of the core diameter or so. Yes, you can get enough distrib; /archives//html/RFI/2001-11/msg00022.html (6,933 bytes)
14. [RFI] N4VI House Wiring (score: 1): Author: Palomar Engineers <Palomar@compuserve.com> (Palomar Engineers); Date: Sun, 10 Jun 2001 13:53:14 -0400; We had one customer who treated the wiring as his house was being built but it's too early to know if it helped. My suggestion is to put toroids over the telephone lines right where the phones will c; /archives//html/RFI/2001-06/msg00005.html (6,808 bytes)
15. [RFI] Jon Ogden - Touch lamp (score: 1): Author: Palomar Engineers <Palomar@compuserve.com> (Palomar Engineers); Date: Thu, 21 Jun 2001 17:48:05 -0400; For quick inexpensive shielding use aluminum foil from the kitchen. You can't solder to it but just wrap bare wide around tightly to get a ground lead if you need one. -- Jack, K6NY, Palomar Engineer; /archives//html/RFI/2001-06/msg00026.html (6,633 bytes)
16. [RFI] Touch Light Update #3 (score: 1): Author: Palomar Engineers <Palomar@compuserve.com> (Palomar Engineers); Date: Tue, 26 Jun 2001 23:36:48 -0400; F50B-77 is 2400 mH/1000t so the 10 turns is 216 uH. But 77 material is quite lossy at 14 MHz and inductance is too high anyway. Better to use about 15 turns on a T50-6 to get 1 uH with good "Q". -- I; /archives//html/RFI/2001-06/msg00037.html (7,441 bytes)
17. [RFI] florescent lighting (score: 1): Author: Palomar Engineers <Palomar@compuserve.com> (Palomar Engineers); Date: Thu, 31 May 2001 13:32:44 -0400; Re: Richard White inquiry. I am using two types of the screw-in replacement bulbs. One is by Lights of America. They come on with a flash then give steady light. They appear to be quiet. -- The other; /archives//html/RFI/2001-05/msg00055.html (6,577 bytes)
18. [RFI] Nutone Intercom problem (score: 1): Author: Palomar Engineers <Palomar@compuserve.com> (Palomar Engineers); Date: Sun, 7 Jan 2001 16:44:57 -0500; We stock "split-bead" ferrites that work on intercoms. This is a common problem and usually can be solved by putting the beads over the wires entering the main "electronics box". The principle is tha; /archives//html/RFI/2001-01/msg00017.html (7,660 bytes)
19. [RFI] Nutone Intercom (score: 1): Author: Palomar Engineers <Palomar@compuserve.com> (Palomar Engineers); Date: Sun, 7 Jan 2001 22:51:35 -0500; Tim your photos of the Nutone panel and the fact that there are 20 flat cables involved makes me think you should not attempt the job. I don't like to discourage hams from purchsing our ferrites but; /archives//html/RFI/2001-01/msg00019.html (7,915 bytes)
20. [RFI] Tracing phone lines (score: 1): Author: Palomar Engineers <Palomar@compuserve.com> (Palomar Engineers); Date: Wed, 24 Jan 2001 16:31:02 -0500; The easy way to get rid of the problem (and usually works) is to use some F82-77 ferrite toroids. Unplug the cable from the phone, wind it three times through the core and plug back in. Phones with p; /archives//html/RFI/2001-01/msg00034.html (6,858 bytes)

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