CMC-130S-3K 1-30MHz

(3 customer reviews)


Common Mode Filter Choke / Noise Suppressor / Line Isolator

The common-mode filter or choke may be one of the best-kept secrets…

  • Multi-Zs™ Technology
  • Covers 1-30MHz
  • Power 3kW *ICAS
  • Common-mode attenuation: ~40dB
  • Choking Impedance 5,000-10,000 Ohms
SKU: CMC-130S-3K Category: Tags: , ,


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

This is a smaller (economy version) of a popular CMC-130-3K. This product has 5000-10,000 Ohms of CMI (Common Mode Impedance) on 1.8-30MHz while maintaining a Resistive part of CMI for more than 25MHz of the frequency spectrum.

  • Multi-Zs™ Technology
  • Perfect to cure RFI/EMI problems.
  • Great noise suppressor!
  • Common-mode attenuation is up to ~40dB max. (measured in 50 Ohms systems)
  • Zmag-Impedance Magnitude     
  • Rs-Series Choking Resistance      
  • Xs-Series Choking Reactance

It is a cure for noisy locations, reduce the noise floor of your receiver by several S-units instantly.  If you have unbalanced antennas such as OCF dipole or your antennas close to your home, adding one CMC130S-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-130s-3K 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-130S-3K Common Mode Choking Impedance and its Resistive (Rs) part is always higher than the Reactive part (Xs) over the working bandwidth. This parameter, Rs>Xs ensures 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.

See the video of CMC’s in action at AC0HF station

CMC-130S-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.

*ICAS = Intermittent Commercial and Amateur Service

Additional information

Common-mode attenuation:

~40dB maximum

Frequency Range:

1-30 MHz

Maximum Power:

3kW I.C.A.S


PTFE/silver SO-239 connector with Gold pin


(L x W x H) (in / mm) 9.00 x 2 in. / 229 x 51 mm


1.1 lb (0.49 kg)

3 reviews for CMC-130S-3K 1-30MHz

  1. Tim KI7NAD

    I just wanted to tell you how well the common mode choke is working for me. I was having trouble even using 20 meters because the noise level was so high, now I have no trouble and just was able to hear dozens of stations and make contact where I know I would not have been able to before. Thanks for the great product, I am very impressed with both the choke and antenna. Tim KI7NAD

  2. Robert (verified owner)

    This is an amazing product! It cut my noise floor levels on a few bands by OVER two S-levels. No joke – just plug and play. Easily worth every cent!

  3. Dave LeBlanc W1DLB (verified owner)

    Has worked tremendously well for me.

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