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1993-11-21
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>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, us 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 2 M 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,
Molel 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