File: RFISOURC.TXT Updated: November 29, 1995 ARRL EMI/RFI Products Resources From the files of the ARRL Automated Mail Server, (info@arrl.org): Prepared as a membership service by the American Radio Relay League, Inc., Technical Information Service, 225 Main St., Newington, CT 06111 (860) 594-0200. Email: tis@arrl.org (Internet). Thank you for requesting the following information from the ARRL Technical Information Service or the ARRL Automated Mail Server (info@arrl.org). ARRL HQ is glad to provide this information free of charge as a service to League members and affiliated clubs. For your convenience, you may reproduce this information, electronically or on paper, and distribute it to anyone who needs it, provided that you reproduce it in its entirety and do so free of charge. If you have any questions concerning the reproduction or distribution of this material, please contact Michael Tracy, American Radio Relay League, 225 Main St., Newington, CT 06111 (email: mtracy@arrl.org). EMC BOOKS AND PUBLICATIONS Radio Frequency Interference: How To Find It and Fix It, American Radio Relay League, 225 Main St., Newington CT 061111, (860) 594-0200, order #3754, $15.00 plus $3.00 shipping and handling. The Interference Handbook, Radio Publications, Inc., available from American Radio Relay League, order #6015, $12.00 plus $3.00 shipping and handling. The Radio Amateur's Guide to EMC, Radio Society of Great Britain, Cranborn Road, Potters Bar, Herts EN6 3JE, Great Britain The ARRL Technical Information Service (TIS) has prepared a series of free EMI information packages. The "EMI/.RFI Package" and "EMI/RFI - Telephone" are the most comprehensive. Contact the ARRL Technical Department Secretary for a list of available TIS packages. Contact the ARRL "RFI Desk" for additional information and help with interference problems involving Amateur Radio stations. For interference involving other radio services contact your nearest FCC Field Office. An extensive list of free pamphlets about electromagnetic interfererence and lightning protection is available from Industrial Communications Engineers, POB 18495, Indianapolis IN 46218-0495, (317) 545-5412. Request their free publications list. A several page free pamphlet about telephone interference is available from K-Com, POB 82, Randolph OH 44265, (216) 325-2110. Request their free telephone RFI handout. Interference Control Technologies, State Route 625, POB D, Gainsville, VA 22065, (703) 347-0030, publishes a wide range of interference books for the commercial EMC field. They also offer consultation services. LOW-PASS FILTERS, BANDPASS TRANSMIT FILTERS Barker and Williamson (B&W), 10 Canal St, Bristol PA 19007, 215-788-5581, Model FL10/100, Model FL10/1500 Bencher, 831 North Central Ave., Wood Dale, IL 6191, 708-238-1183, Model YA-1 Bird, 30303 Aurora Rd, Cleveland, OH 44139-2794, 216-248-1200, Model 5040 series Industrial Communications Eng , POB 18495, Indianapolis IN 46218-0495, 317-545-5412, Model 400 series band-pass, Model 420 series low-pass Kilo-Tec, POB 10, Oak View CA 93022, 805-646-9645, Model KT-LPF2 MFJ, POB 494, Mississippi State, MS 39762, 601-323-5869, Model MFJ-704 Radioware, POB 1478, Westford MA 01886, 800-950-WARE (9273) Ten-Tec, 1185 Dolly Parton Parkway, Sevierville TN 37862, 615-453-7172, Model 5061 Unadilla, POB 4215, Andover MA 01810-4215, 508-975-2711, Model WA2ZOT, WA2ZOT-6Meter HIGH-PASS FILTERS The high-pass filter is the first line of defense against TVI to antenna-connected televisions that is caused by HF radio transmitters! A high-pass filter is not usually needed or effective with interference problems to CATV-connected TVs. For cable interference problems, use a common-mode choke. Note: High-pass filters are usually available from the local electronics distributor that sells parts to your local electronics service businesses. Consult the Yellow Pages under "Electronic components - wholesale and manufacturer." Channel Master, 1315 Industrial Park Dr., Smithfield NC 27577, 919-934-9711, several models Industrial Communications Engineers, POB 18495, Indianapolis IN, 46218-0495, 317-545-5412, Model 430 series high-pass Radio Shack, Catalog: 15-579 75-ohm, 15-582 or 15-581 300-ohm Ten-Tec, 1185 Dolly Parton Parkway, Sevierville TN 37862, 615-453-7172, Model 5060 Winegard, 3000 Kirkwood St, Burlington IA 52601-1007, Model HP-2700 COMMON-MODE CHOKES Industrial Communications Engineers, POB 18495, Indianapolis IN, 46218-0495, 317-545-5412 Starplex, Inc., 1912 Falcon, Hanley Hills, MO 63133, 314-423-5756, Model Ghost Buster dual-ferrite choke (Note: this firm may be out of business. A recent mailing received no response. If you have information on this company, please notify the ARRL Technical Information Service). TCE Labs, 2365 Waterfront Park Drive, Canyon Lake, TX 78133, (210) 899-4575, Model # BX#2S CABLE-TV SET-TOP CONVERTERS The following set-top converters have been reported as being relatively immune to cable-TV interference: (Additional reports are sought.) General Instruments/Jerrold: Bar code - TOA1104176B5 VHF-NOTCH FILTERS Amateur VHF stations can interfere with antenna-connected televisions. Television tuners do not often have much adjacent-channel rejection, resulting in severe fundamental overload. These tunable notch filters will reject the strong amateur signal, allowing the television to function normally. Note: these filters will not help when an amateur signal is interfering with cable channel 18 (channel E). In that case, the problem results because cable channel 18 and the Amateur 2-meter band occupy the same frequencies. Some of these filters are expensive. Contact the vendor before ordering. Microwave Filter Company 6743 Kinne St, Syracuse NY 13057, (315) 437-3953, Filter: 5KMT-A-I (reject 108-170 MHz) Filter: 5KV-E (Channel E (146.25 MHz) (Cable ch 18) trap) Filter: 5KV-K (Channel K (223.25 MHz) (Cable ch 24) trap) Filter: F6367-2 (Notch filter 50-108 MHz, 75-ohm) Filter: F6367-3 (Notch filter 108-216 MHz, 75-ohm) Filter: F6367-4 (Notch filter 216-450 MHz, 75-ohm) Filter: F6367-5 (Notch filter 450-900 MHz, 75-ohm) Note: They will sell single units. Prices do not include shipping. RMS Electronics, 621 Route 46, Hasbrouck Heights, NJ 07064 (201) 288-8833, Filter: MBR-A-2-I (reject 88-170 MHz) Filter: MBR-A-I (reject 108-170 MHz) Filter: LLMBRLPF (pass ONLY VHF ch2-6 and 7-13) Filter: PT-EN 20321 (Channel E (146.25 MHz) (Cable ch 18) trap) Filter: PT-KN 20327 (Channel K (223.25 MHz) (Cable ch 24) trap) Note: Call to find nearest distributor US Electronics, 585 North Bicycle Path, Port Jefferson, NY 11776 (516) 331-2552, Filter: LLMBRLPF (pass ONLY VHF ch2-6 and 7-13) Filter: MBR-A-2-I (reject 88-170 MHz) Filter: MBR-A-I (reject 108-170 MHz) Filter: MWT-4 (pass 54-300 MHz, reject tunable notch) Note: Will sell single units. Call for nearest distributor. Star Circuits, POB 94917, Las Vegas, NV 89193, 800-433-6319 Note: Tunable notch filters, Model 23H tunes 6M, Model 1822 tunes 2M Model: 46FM tunes FM Broadcast Band Winegard, 3000 Kirkwood St, Burlington, IA 52601-1007, Model: UT-2700 notched 470 to 800 MHz Model: BF-1700 attenuates 110-170 MHz (eliminates 2M signal) TELEPHONE EMI FILTERS AT&T, Model: Z100B1, SKU # 09205, Call 800-222-3111 for the location of nearest AT&T Phone Store., Note: The Z100 and Z101A are now obsolete. They are not effective at the upper HF band (>10 MHz). The new AT&T telephone EMI/RFI filter is the Z100B1. Reports about it are mixed, but it is readily available. Coilcraft, 1102 Silver Lake Rd, Cary, IL 60013, 800-322-2645 Engineering Consulting, 583 Candlewood St, Brea, CA 92621, 714-671-2009, Model TRIF Industrial Communications Engineers, POB 18495, Indianapolis IN, 46218-0495, 317-545-5412, Model 460 series telephone/audio filters K-Com, POB 82, Randolph OH 44265, 216-325-2110, Model RF-1 (modular), Model RF-2 (wired) Kilo-Tec, POB 10, Oak View, CA 93022, 805-646-9645, Model KT-RTK telephone filter kit Measures, Richard, 6455 LaCumbre Rd, Somis, CA 93066, 805-482-3034 Southwestern Bell, Freedom Phone Accessories, 7486 Shadeland Station Way, Indianapolis, IN 46256, 317-576-6847, Model ZM04223 Sparrevohn Engineering, 143 Nieto Ave SW #1, Long Beach, CA 90803, 714-642-7323, 310-433-7240, Model F-1 (single-line), Model F-2 (two-line) TCE Labs, 2365 Waterfront Park Drive, Canyon Lake, TX 78133 (210) 899-4575, Model TP-5301 (one-line, modular), Model TP-5302 (two-line, modular) Telecom Industries, 1385 Akron St, Copiague, NY 11726, 516-789-5020, Model 831-W1 EMI-RESISTANT TELEPHONES PRO Distributors, 2811-B 74th St, Lubbock TX 79423, 800-658-2027, PRO Distributors telephones are guaranteed to eliminate RFI or your money back. Radio Shack, Model: ET-290 Catalog: 43-585 Model: ET-171 Catalog: 43-374A, Model: ET-141 Catalog: 43-595, Reports from ARRL Technical Coordinators indicate that these telephones have a high degree of built-in immunity. This is not necessarily guaranteed by Radio Shack. Other Radio Shack telephones have not been tested. TCE Labs, 2365 Waterfront Park Drive, Canyon Lake, TX 78133 (210) 899-4575, Model TPXL-1WD (one-line wall or desk), Model TPXL-2D (two-line, desk), TCE Labs telephones are guaranteed to eliminate RFI or your money back. OLD AT&T telephones, made by several different companies, notably models 300, 500 (rotary), 2500 (DTMF), 2554 (DTMF wall phone,). These phones are made by AT&T (Western Electric), Comdial (Stromberg Carlson), Northern Telecom, and ITT. These phones have no semiconductors in them and have a carbon microphone, hence the RF immunity. The only devices that can produce problems are the silicon carbide varistors. Most of these phones are no longer being manufactured but are sometimes found used at garage sales or flea markets. The ARRL Technical Department has received one report (each) that the following telephones are immune to EMI. Additional reports about these telephones are sought. (Note - just because one phone by a particular manufacturer is immune does not indicate that ALL phones by that manufacturer are immune! Several of these manufacturers have phones for which we have received inteference reports.) Phonemate 8250 AT&T 5300 and 5400 (cordless telephones.) Conairephone PR1001 NT Meridian Centrex telephone sets TELEPHONE COMPANY CONTACTS AT&T, 800-222-3111 Cobra Comm, 800-262-7222 General Electric, 800-447-1700 ITT - Technical Assistance, 601-287-5281 Lonestar, 516-939-6116 Toshiba, 714-583-3700 TT System, 914-968-2100 FERRITE MATERIALS Amidon, 3122 Alpine Avenue, Santa Ana, CA 92799, 714-850-4660 Fair-Rite Products Corp, PO Box J, 1 Commercial Row, Wallkill, NY 12589, 914-895-2055, Note: Call to locate nearest distributor Kilo-Tec, POB 10, Oak View CA 93022, 805-646-9645 MFJ, POB 494, Mississippi State, MS 39762, 601-323-5869 Ocean State Electronics, POB 1458, Westerly RI 02991, 401-596-3080 Palomar, POB 462222, Excondido, CA 92046, 619-747-3343 Radio Shack catalog #s 273-105 and 273-104 AC-LINE FILTERS Industrial Communications Engineers , POB 18495, Indianapolis IN 46218-0495, 317-545-5412, Model 472 isolator, Model 400 series Radio Shack, Catalog: 15-1111 brute-force AC-line filter, 26-1395 surge- protection filter (it contains common-mode and differential mode AC-line filtering. Note: This model has been discontinued.) TCE Labs, 2365 Waterfront Park Drive, Canyon Lake, TX 78133 (210) 899-4575, Model KW-1 MISCELLANEOUS Industrial Communications Eng, POB 18495, Indianapolis IN, 46218-0495, 317-545-5412, Model 461 stereo , Model 440 mobile, Model 488 video Radio Shack (mobile) 270-051, 270-055, 270-054, 270-012, 272-1085, 270-030 TCE Labs, 2365 Waterfront Park Drive, Canyon Lake, TX 78133 (210) 899-4575, Model SP-1 speaker leads Wacom Products, Cavities and duplexers, POB 21145, Waco, TX 76702, 817-848-4435 Winegard, 3000 Kirkwood St, Burlington, IA 52601-1007, Model FT-7600 variable FM trap, Model VF-3000 VCR, Model VF-4000 VCR *eof