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 (203) 666-1541. Email: tis@arrl.org (Internet). file: \public\info\tis\rfisource.txt updated: 06-07-93 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). SOURCES OF EMI PRODUCTS EMC BOOKS AND PUBLICATIONS Radio Frequency Interference: How To Find It and Fix It, American Radio Relay League, 225 Main St., Newington CT 061111, (203) 666-1541, 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 83, Randolph OH 44265, (216) 325-2110. Request their free telephone RFI handout. 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, 333 W Lake St, Chicago IL 60606, 312-263-1808, Model YA-1 Bird , 30303 Aurora Rd, Solon 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 Ten Tec, 1185 Dolly Parton Parkway, Sevierville TN 37862, 615-453-7172, Model 5061 Unadilla, POB 4215 BV, Andover MA 01810, 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, Industrial Park Dr., Smithfield NC 27577, 919-934-9711, several models Cornell Dublier Electronics, 1605 E Rodney French Blvd, New Bedford, MA 02741, 617-996-8561 Industrial Communications Engineers, POB 18495, Indianapolis IN, 46218-0495, 317-545-5412, Model 430 series high-pass N6YHY TVI Filters , 928 Yellow Brick Rd, Modesto CA 95351, 209-531-1236, Model YAK-plus TVI filter 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 N6YHY TVI Filters, 928 Yellow Brick Rd, Modesto CA 95351, 209-531-1236, Model Gorilla TVI choke Starplex, Inc., 1912 Falcon, Hanley Hills, MO 63133, 314-423-5756, Model Ghost Buster dual-ferrite choke TCE Labs , RR9 Box 243D, New Braunfels TX 78133, 800-KILL-TVI, 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 E 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 600-D No 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, Model: 23H tunes 6 M Model: 1822 tunes 2M Model: 46FM tunes FM BCB 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 83, 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 N6YHY TVI Filters, 928 Yellow Brick Rd, Modesto CA 95351, 209-531-1326, Model Zebra telephone filter 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, RR9 Box 243D, New Braunfels TX 78133, 800-KILL-TVI, Model TP-5301 (one-line, modular), Model TP-5302 (two-line, modular) Telecom Industries, 1385 Akron St, Copiage 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-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, RR9 Box 243D, New Braunfels TX 78133, 800-KILL-TVI, Model TPXL (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 National Sales and Service Center, 800-222-3111 Cobra Comm, 800- 262-7222 Code-A-Phone, 503-655-8940 Fun Products, 415-540-0334 General Electric, 800-447-1700 ITT - Technical Assistance, 601-287-5281 Lonestar, 516-939-6116 Northern Telecom, 919-992-5743 PacTel, 800-426-2372 Panasonic Consumer Electronics, 800- 221-3438 ext 6881 Phonemate, 800-247-7889, 213-320-9810 Plantronics, 800-538-0748, 800-662-3902 CA Sanyo, 800-524-0047 ext. 502 or 520 Soundesign Corporation, 201-434-1050 Swisstel, 201-470-5706 Toshiba, 714-583-3700 TT System, 914-968-2100 Uniden Corp., 317-842-2483 FERRITE MATERIALS (use to make common-mode chokes) Amidon, 2216 E Gladywick St, Domininguez Hills CA 90220, 310-763-5770 Fair-Rite Products Corp, div of Dexter Magnetic Materials, 10 Fortune Drive, Billerica MA 01865, 800-345-4082, 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 N6YHY TVI Filters, 928 Yellow Brick Rd, Modesto CA 95351, 209-531-1236 Ocean State Electronics, POB 1458, Westerly RI 02991, 800-523-0667 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.) TCE Labs, RR9 Box 243D, New Braunfels TX 78133, 800-KILL-TVI, Model KW-1 DIRECTION FINDING PRODUCTS Douglas RF Devices, POB 246925, Sacramento CA 95824, no telephone Doppler DF kits 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, RR9 Box 243D, New Braunfels TX 78133, 800-KILL-TVI, 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