"The common-mode filter or choke may be one of the best-kept secrets"  
                                                                                American Radio Relay League Antenna Handbook

UNMATCHED Performance by any similar product on the market!
The CMC130-3K peak to whopping 15,000 Ohms of common mode impedance or ~41dB attenuation

If you use End Fed antenna aka 9:1 UNUN with a piece of wire, OCF dipole antenna or have any RFI problem, use the best tool to cure it. Great for CB and HF mobile operation. Do not fall for those coiled coax chokes which can make the problem worse in some cases. There is no shortcut when it comes to curing RFI/EMI problems after all Ferrite materials are invented for that purpose. Ferrite turns the RF energy into heat, coiled coax does not! 

CMC-130-3K Common Mode Choke / Noise Suppressor / Line Isolator / RFI Suppressor
                  Designed by Danny Horvat, E73M -former Cushcraft antenna designer. 
                                

CMC-130-3K Common Mode Choke / Noise Suppressor / RF Isolator

This is the one and only Common Mode Filter Choke for 1-30 MHz on the market.  It is only product with over 10,000 Ohms of CMI (Common Mode Impedance) on 3.8-30MHz while maintaining a Resistive part of CMI for more than 25MHz of the frequency spectrum.

  • Perfect to cure RFI/EMI problems.
  • Great noise suppressor!
  • Common-mode attenuation is up to ~41dB max. (measured in 50 Ohms systems)
  • Size 10x2 inches or  254/51mm


It is a cure for noisy locations, reduce the noise floor of your receiver by several S-units instantly.  If you have unbalanced antenna such as OCF dipole or your antennas close to your home, adding one CMC130-3K will greatly reduce RF Interference problems on your equipment and 120/220V wiring inside your home. We do not claim “one size fits all” but actually we design, measure and make such products. Our CMC-130K has huge Resistive values of Common Mode Choking Impedance from 1.8-30MHz, click the chart on the side for actual measurement data.

Unlike other companies, we do not claim unrealistic impedance values or frequency coverage. Most important, the value of CMC-130-3K Common Mode Choking Impedance and its Resistive (Rs) part is always higher than Reactive part (Xs) over the working bandwidth. This parameter, Rs>Xs ensure that our CMC will NOT increase common mode currents as could with inferior coaxial cable chokes.

Only chokes with Resistive (Rs>Xs) CMI- Common Mode Impedance stops and dissipate unwanted RF or noise coming to your equipment for sure.

CMC-130-3K Features:

  • SO-239 PTFE (Teflon®) Connectors which produce no impedance bump but the continuity of coaxial cable where the choke is inserted, it helps minimize leakage of RF in multi/contest stations setups.
  • PTFE (Teflon®) insulated coaxial cable used can handle a lot more than legal power (1500W) in The USA.  It is rated up to 3kW in HF band.
  • The enclosure is UV stable and could be used outside.

 

Frq.(MHz)Zmag(Ohms)Rs(Ohms)Xs(Ohms)
1.9730044505700
3.8990075006300
7.1514000134004200
10.114300142001600
141380013800-800
18.11350013400-1600
21.21390013700-2200
24.91450014100-3300
28.51520014400-5000
  • Zmag-Impedance Magnitude     
  • Rs-Series Choking Resistance      
  • Xs-Series Choking Reactance

Common Mode Choke

*ICAS = Intermittent Commercial and Amateur Service

Only chokes with Resistive (Rs>Xs) CMI- Common Mode Impedance stops and dissipate unwanted RF or noise coming to your equipment for sure. 


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