Fixing RF Problems
Voice & Data Parts, Tools & Training from the Telecom Experts at sandman.com
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RF Eliminators

Modular RF Filter World's Best RF Filters!Hardwire RF Filter

Modular RJ-11     Modular RJ-14     Modular Handset     Hardwire Models

Modular Ethernet RJ-45 RF Filter Ethernet RJ-45 RF Filter

AM     FM     CB     Amateur and RF Sealing Frequencies

Click to see larger HP Analyzer Screen ShotAnalyzer screen shot of frequencies notched out by our AM Filter

Engineered for maximum rejection of unwanted frequencies

No single filter can effectively notch out .5 to 150mhz...

But our 4 Frequency Ranges give you the World's Best RF Eliminators

Don't compare our filters to any others!   All of our filters are hand made in the United States, and tuned to the frequency range they're designed to filter. That's why our filters work almost all of the time, and other filters only work some of the time.

Our Filters have eliminated RF problems at tens of thousands of locations all over the country.

We offer a 30 day money-back guarantee, and we have a 99% success rate! The secret is that half the time the RF is coming through the handset cord... Not the line cord!   50% of the filters we sell are for the handset cord!

Our RF Filters will work on audio and data, as well as telephone applications. The Filter will not affect the operation of digital or electronic telephones.

4 frequencies are available! You can stop welding noise by stringing the 4 different frequencies together in-series, to filter from .5 to 150mhz (welding equipment puts out garbage all over the frequency spectrum).

If you're close to a radio station that broadcasts in both AM and FM, you can put 2 filters together in-series to filter them both out, or use our Combo AM/FM Filters.

Our customer's have reported success in filtering out AM radio interference from 10-BaseT Ethernet networks. We have two pair and four pair (for Gigabit or POE) Ethernet Filters.

Our Handset Filters also work for Headset RF problems.

For these filters to be effective, you MUST determine where the RF is getting into the phone or system. Putting these filters on the phone's line cord, when the RF is coming in through the handset cord, is totally useless! You can't do anything about RF once it's been turned into audio... You have to stop the RF before it gets turned into audio in the equipment. Our RF Filters do this by preventing the wiring or cords from acting like an antenna, stopping the radio signal from getting to the part that was demodulating the RF into audio.

If you put the RF Filter in the correct place, it's like breaking off the antenna at the base on a radio. Once you break the antenna off, there are no more radio programs.

On the other hand, putting the RF Filter in the wrong place is like breaking off just the top two inches of the radio's antenna. You probably won't notice any difference in the sound of the radio program.

Normally, either the handset cord or the line cord (or building wiring) is what's acting like the antenna. The quickest way to determine if the RF is coming in via the handset cord is to bunch up the cord so that it's real short, or stretch it out so it's real long. If the RF changes, it's probably coming in through the handset cord.

RF is the hardest thing to troubleshoot. You can't see it, smell it, or even hear it...

Click to read our four page RF Elimination Tech Bulletin, which tells you exactly how to determine where the RF is coming in, and the easiest ways to fix it! This bulletin will help to make you an expert at fixing RFI in no time.

Click HERE to see a PDF version of our RF Troubleshooting Flow Chart to help you figure out which filter you need, and where to put it on a phone system.

RF Eliminator Frequency Coverage:

  • AM:  .5 to 3mhz
  • CB:  3 to 30mhz
  • Amateur / RF Sealing:  26 to 60mhz  (RF used to "weld" vinyl, instead of more traditional heat sources)
  • FM:  60 to 150mhz

  • COMBO AM and FM:  .5 to 3mhz  and  60 to 150mhz

    RF Eliminator Models:

  • 1 Pair Modular:  RJ-11
  • 2 Pair Modular:  RJ-14
  • Handset Modular:  RJ-9 or RJ-22  (Also works on headsets)
  • Hardwire:  White/Blue pair IN, White/Blue Pair OUT  (Comes with 4 Beanies)
  • Ethernet RJ-45 2 Pair Modular:  Filters 2 Pairs used for 10 and 100Base-T Ethernet  (Pairs 2 and 3 only)
  • Ethernet RJ-45 Modular:  Filters 4 Pairs used for Gigabit Ethernet and POE Ethernet  (Covers 4 Pairs)
            This Filter also works for RJ-45 connections on T1 Lines, and 4 Pair Merlin Phones
            NOTE: The 4 Pair RF Filter comes with Shielded 8 Pin Jacks for IN and OUT (bonded together) and a Shielded 1' Patch Cord

    LOOK.GIF (1001 bytes)

    Modular RF Filter Modular RF Filters...


    1 PAIR AM RF Eliminator

    .5 to 3mhz RJ-11

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: WAL1G   Price: $19.50


    1 PAIR CB RF Eliminator

    3 to 30mhz RJ-11

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: WAL1H   Price: $19.50


    1 PAIR AMATEUR / SEALING RF Eliminator

    26 to 60mhz RJ-11

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: WAL1O   Price: $19.50


    1 PAIR FM RF Eliminator

    60 to 150mhz RJ-11

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: WAL1I   Price: $19.50



    2 PAIR AM RF Eliminator

    .5 to 3mhz RJ-14

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: WAL1A   Price: $23.50


    2 PAIR CB RF Eliminator

    3 to 30mhz RJ-14

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: WAL1B   Price: $23.50


    2 PAIR AMATEUR / SEALING RF Eliminator

    26 to 60mhz RJ-14

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: WAL1N   Price: $23.50


    2 PAIR FM RF Eliminator

    60 to 150mhz RJ-14

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: WAL1C   Price: $23.50



    HANDSET AM RF Eliminator

    .5 to 3mhz Handset

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: WAL1D   Price: $23.50


    HANDSET CB RF Eliminator

    3 to 30mhz Handset

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: WAL1E   Price: $23.50


    HANDSET AMATEUR / SEALING RF Eliminator

    26 to 60mhz Handset

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: WAL1M   Price: $23.50


    HANDSET FM RF Eliminator

    60 to 150mhz Handset

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: WAL1F   Price: $23.50


      AM RF FILTER JACK - 1 Pair

    AM RF Filter built into a Surface Mount Jack



    AM RF Filter in a Surface Mount Jack - 1 Pair



    1 Pair Surface Mount Ivory Jack with an AM RF Filter built-in.

    Screw Terminals make it easy to connect multiple cables to this one jack.

    The phone line goes on the T & R screw terminals, and the phones go on T1 and R1 screw terminals.

    One additional set of screw terminals is provided to allow termination of the second pair (White/Orange or Black/Yellow), but be aware that it's not a good idea to have an unfiltered pair - which can act like an antenna and defeat the purpose of the RF Filter on the first line (the RF gets induced back onto the first pair by the unfiltered pair).

    This is bigger than a standard biscuit jack: 4.25 inches long, 2 inches high, and 1 inch deep. Base has holes for mounting with screws (no double stick tape).

    For indoor use. Not weatherproof.

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: WAL2B   Price: $18.95    |||    3+ Price:   $17.95


    Modular RF Filter Hardwire RF Filters...

      These Filters are color coded, and come with 4 Beanies (Crimp-on B-Wire Connectors).

    • AM: White
    • CB: Yellow
    • AMATEUR / RF SEALING: Green
    • FM: Black


    1 PAIR HARDWIRE AM RF Eliminator

    .5 to 3mhz White/Blue IN - White/Blue OUT

    Comes with 4 Beanies (B-Wire Connectors)

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: WAL1K   Price: $13.95


    1 PAIR HARDWIRE CB Eliminator

    3 to 30mhz White/Blue IN - White/Blue OUT

    Comes with 4 Beanies (B-Wire Connectors)

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: WAL1L   Price: $13.95


    1 PAIR HARDWIRE AMATEUR / SEALING RF Eliminator

    26 to 60mhz White/Blue IN - White/Blue OUT

    Comes with 4 Beanies (B-Wire Connectors)

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: WAL1Q   Price: $13.95


    1 PAIR HARDWIRE FM RF Eliminator

    60 to 150mhz White/Blue IN - White/Blue OUT

    Comes with 4 Beanies (B-Wire Connectors)

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: WAL1R   Price: $13.95


    Modular RJ-45 2 Pair Ethernet RF Filter 2 Pair  Ethernet RF Filter

    Place a Filter at one or both ends of an Ethernet cable.

    It notches out the specific frequency band so the NIC Card or Hub/Switch can't demodulate the signal that's coming in on the cable (which is acting like an antenna).

    Male to Female RJ-45.  It only passes pairs 2 and 3 (the White/Orange and White/Green Pairs, on pins 1-2 and 3-6). The other two pairs, which are not used for regular 10 or 100Base-T, do not pass through the Filter.

    For Gigabit Ethernet and POE (Power Over Ethernet) use our 4 Pair RJ-45 RF Filters (below).

    Might work with POE (Power over Ethernet) if it's on the two pairs used for transmit and receive on 10/100 Ethernet, but the 4 Pair RF filter (below) would be a better choice.

    2 Pair Ethernet RF Filter has two non-shielded RJ-45 Jacks, and comes with a 1 Foot Non-Shielded Patch Cord.


    2 Pair  Ethernet RF Eliminator - AM

    .5 to 3mhz 2 Pair RJ-45

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: WAL2R   Price: $38.95


    2 Pair  Ethernet RF Eliminator - CB

    3 to 30mhz 2 Pair RJ-45

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: WAL3I   Price: $38.95


    2 Pair  Ethernet RF Eliminator - SEALING

    26 to 60mhz 2 Pair RJ-45

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: WAL3J   Price: $38.95


    2 Pair  Ethernet RF Eliminator - FM

    60 to 150mhz 2 Pair RJ-45

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: WAL2S   Price: $38.95


    Modular RJ-45 4 Pair RF Filter 4 Pair  RJ-45 RF Filter with SHIELDED Jacks

    Now with SHIELDED jacks and a 1' SHIELDED Patch Cord

    Place a Filter at one or both ends of a 4 Pair modular cable.

    It notches out the specific frequency band so the device with the RJ-45 connection can't demodulate the signal that's coming in on the cable (which is acting like an antenna).

    Male to Female RJ-45.  It passes all four pairs of an RJ-45. Works on Gigabit Ethernet (1000BaseT) and POE (Power Over Ethernet) devices.

    Works with POE (Power over Ethernet).

    RJ-45 RF Filter has two SHIELDED RJ-45 Jacks (either one works for in or out), and comes with a 1 Foot SHIELDED Patch Cord.


    4 Pair  RJ-45 RF Eliminator - AM

    .5 to 3mhz 4 Pair RJ-45

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: WAL3K   Price: $54.95


    4 Pair  RJ-45 RF Eliminator - CB

    3 to 30mhz 4 Pair RJ-45

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: WAL3M   Price: $54.95


    4 Pair  RJ-45 RF Eliminator - SEALING

    26 to 60mhz 4 Pair RJ-45

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: WAL3O   Price: $54.95


    4 Pair  RJ-45 RF Eliminator - FM

    60 to 150mhz 4 Pair RJ-45

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: WAL3L   Price: $54.95


      10 INCH CONNECTOR SEALER

    Click to see bigger picture of the Connector Sealer on an RF Filter

    Moisture Proof Connections to use them Outdoors...
    10 Inches of Connector Sealer

    Wrap this 10" long by 1/2" wide strip of Connector Sealant
    around an electronic device to moisture proof it!

    Connector Sealer adheres to itself and other items. Forms around and seals odd-shaped and difficult connections. Wrap the item, then squish the Connector Sealer to mold it to a smooth surface, forcing air out.

    Connector Sealer stays flexible for years, ensuring moisture-proof connections. It's even reusable in many cases!

    You may need several strips of Connector Sealer for odd-shaped items like RF Filters.

    Non-contaminating and non-conductive. Works from -30 to +180 degrees Fahrenheit.

    Part Number: TLS8K   Price: $0.99    |||    3+ Price:   $0.69


    Modular RF Filter Combo AM /FM FiltersHardwire AM/FM RF Filter

    If you don't know whether it's AM or FM, use the Combo AM / FM Filter!

    US radio stations normally give their call sign between five minutes to the hour, and five minutes past the hour. If they don't give their frequency, you can look them up in the phone book and give them a call.

    Keep in mind that some radio stations "simulcast" on both an AM and FM frequency. That means the same programming is broadcast on both frequency bands, so you won't know for sure whether the interference you're getting is from AM or FM. In that case, you'll have to try both filters to see which one helps, or use our AM / FM Combo Filter.

    These Filters are a little more expensive than our regular single frequency band Filters, but they could save you a lot of time, and possibly one or more trips back to the customer.

    Keep some in your case!


    1 PAIR AM / FM RF Eliminator

    .5 to 3mhz and 60 to 150mhz RJ-11

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: WAL2O   Price: $26.95


    2 PAIR AM / FM RF Eliminator

    .5 to 3mhz and 60 to 150mhz RJ-14

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: WAL4A   Price: $31.95


    HANDSET AM / FM RF Eliminator

    .5 to 3mhz and 60 to 150mhz Modular Handset

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: WAL4B   Price: $31.95


    1 PAIR HARDWIRE AM / FM RF Eliminator

    Hardwire AM/FM RF Filter

    .5 to 3mhz and 60 to 150mhz White/Blue IN - White/Blue OUT

    Comes with 4 Beanies (B-Wire Connectors). These Filters are a little bigger than our regular single frequency range Hardwire RF Filters.

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: WAL2P   Price: $21.95


    Click to ignup for Mike Sandman's Montly Tech Tips by email


    Click to see bigger picture of the 8 Pin DIP Mount RF Filter 8 Pin DIP Mount RF Filters

    Convenient 8 Pin DIP Mount for OEM use

    Use the World's Best RF Eliminator in your own product!

    These are the same RF Filters we use in our finished product, available on an 8 pin DIP base so you can use them in your own project.

    They're available in both one and two pair versions. The one pair version uses the center pair of the DIP, and the two pair version uses the two outside pins for the second pair. These would be extremely easy to design into your own product.

    While it might seem trivial to design an RF Filter, it's not! Our team of RF Engineers spent hundreds of hours researching the perfect materials and design for an RF Filter.

    It will work well on audio and data, as well as telephone applications. The filter will not affect the operation of digital or electronic telephones. Because it's a common mode filter, it will catch spikes that could effect the electronics in your product.

    Each Filter is thoroughly tested after assembly.


    1 PAIR AM DIP RF Eliminator

    .5 to 3mhz 8 Pin DIP

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: TLS6A   Price: $9.95    |||   100+ Price:   $8.95


    2 PAIR AM DIP RF Eliminator

    .5 to 3mhz 8 Pin DIP

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: TLS6B   Price: $10.95    |||   100+ Price:   $9.95


    1 PAIR CB DIP RF Eliminator

    3 to 30mhz 8 Pin DIP

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: TLS6C   Price: $9.95    |||   100+ Price:   $8.95


    2 PAIR CB DIP RF Eliminator

    3 to 30mhz 8 Pin DIP

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: TLS6D   Price: $10.95    |||   100+ Price:   $9.95


    1 PAIR AMATEUR /SEALING DIP RF Eliminator

    26 to 60mhz 8 Pin DIP

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: TLS6E   Price: $9.95    |||   100+ Price:   $8.95


    2 PAIR AMATEUR /SEALING DIP RF Eliminator

    26 to 60mhz 8 Pin DIP

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: TLS6F   Price: $10.95    |||   100+ Price:   $9.95


    1 PAIR FM DIP RF Eliminator

    60 to 150mhz 8 Pin DIP

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: TLS6G   Price: $9.95    |||   100+ Price:   $8.95


    2 PAIR FM DIP RF Eliminator

    60 to 150mhz 8 Pin DIP

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: TLS6H   Price: $10.95    |||   100+ Price:   $9.95


      6' Straight SHIELDED HANDSET CORD

    Click to see bigger picture of our 6' Shielded STRAIGHT Handset Cord 6' Straight SHIELDED Handset Cord

    This cord will eliminate the hum caused by Neon Signs that are near a phone.

    Neon Signs are hip, so "hip" companies think nothing of putting neon tubing all around their office, showroom or reception area, along with fancy neon signs. While it's hip, it's not telephone friendly!

    It takes very high voltage at low current to make the neon gas glow. The transformers that make the high voltage for neon signs use old crummy technology, which put out all kinds of low frequency EMI (Electro Magnetic Interference) garbage.

    A transformer expert I talked to said it's possible to make a clean neon transformer, but nobody wants to spend the money to do it. The transformer manufacturers I tried to talk to wouldn't even return my phone call.

    It turns out that the microphone circuit in most modern telephones has a powerful amplifier that's susceptible to this low frequency interference (harmonics of 60 hertz). Older telephones used a carbon mic, which didn't need the powerful amplifier, so didn't have a problem with neon signs. There are no electronic phones manufactured today that use carbon transmitters (but you can use an old single line 2500 set, or old multi-line 1A2 set).

    The shield is a sophisticated braided material that gives almost 100% shielding, while remaining incredibly flexible.

    This cord is not coiled, and doesn't extend like a regular handset cord. It's straight.

    Not all customers will accept using this cord on a daily basis. Humans are just used to coiled cords. By the way, coiled handset cords became popular in the 1940s (for an extra monthly charge), which is a question often asked after people see the Roswell alien movie (the phone on the wall could have had a coiled cord in 1947).

    This cord is not perfectly smooth. It's made of a conductive braided material, so someone wearing fancy cashmere sweaters, silk, or otherwise expensive fancy material may not be happy with it.

    On the telephone end of the cord, there is a 6' flexible white wire attached to the shield at the modular plug, which is terminated in a small ring terminal. It's absolutely necessary to ground the shield! The easiest way to do this is to extend the white wire down to an AC outlet, and put the ring terminal on the metal screw that holds the outlet cover to the outlet.

    NOTE: We've had some customers report that grounding, or building a shielded/grounded box around a neon transformer, will sometimes eliminate the neon EMI.

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: WAL1J   Price: $29.95    |||    3+ Price:   $27.95


    14' MODULAR LINE CORD for PHONES - CAT5 TWISTED PAIR

    14 foot 4 Wire Twisted Pair Modular Line Cord for Phones


    14 Foot Twisted Pair Modular Line Cord
    fixes Crosstalk and RF Interference Problems






    Long flat Modular Cords aren't twisted, so they're often the cause of crosstalk on KSUless Multi-line phones and RF Interference (Radio Station Interference).

    These CAT5 Twisted Pair Modular Line Cords are round, not flat, The twisted pairs in the line cord reject crosstalk between the lines on an analog multi-line phone.

    A 7' flat line cord may be OK, but when you put a long flat line cord on the phone you're likely to have crosstalk or RF problems. There is no way to solve those problems unless you change the line cord to twisted pair.

    How do you know it will work for your problem? You've got to try it to find out.

    See our Crosstalk and RF Tech Bulletins for more information on fixing these types of problems.

    How much can crosstalk cost you if the wrong person overhears a conversation on another line? Read our Crosstalk Tech Bulletin to see how it cost one guy $180,000,000 (yes, that's $180 million).

    Uses standard Modular Plugs that fit in a telephone jack for 1 or 2 lines (RJ-11 or RJ-14).

    We also make a 25' Twisted Pair Line Cord (below).

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: SWI3G   Price: $6.99


    25' MODULAR LINE CORD for PHONES - CAT5 TWISTED PAIR

    25 foot 4 Wire Twisted Pair Modular Line Cord for Phones


    25 Foot Twisted Pair Modular Line Cord
    fixes Crosstalk and RF Interference Problems






    Same as above, 25 feet long.

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: SWI3H   Price: $8.99


    We can engineer and manufactuer special devices quickly!



    We Specialize in Strange Telecom Stuff!

    If you need a piece of telecom or electronic equipment manufactured, use our telecom expertise, our existing products, our plastic enclosures, and short run manufacturing experience to help you get your product made quickly.

    It may take us as little as a day to engineer a way to solve a strange problem, and only a short time to put it into production... even in small quantities.






    CAPACITORS FOR FIXING RF PROBLEMS

    They must be used in pairs, one on the tip to ground, and one on the ring to ground.

    These will work well for lower frequencies like AM, but will have little or no effect on FM. Using capacitors to drain the RF to ground can cause other problems on the line, because of increased capacitance.

    Keep some in your case!


    .01mf 100V Capacitor

    Bag of 10

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: SER9F   Price: $1.69


    .02mf 100V Capacitor

    Bag of 10

    Comes with sandman.com 30 Day Moneyback Guarantee

    Part Number: SER9G   Price: $1.69


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