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CMC-130S-3K 1-30MHz

(13 customer reviews)

Original price was: $89.95.Current price is: $79.95.

Common Mode Choke / Noise Suppressor / Line Isolator

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

  • 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: , ,

Description

CMC-130S-3K Common Mode 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, instantly reducing the noise floor of your receiver by several S-units.  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 importantly, 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 station 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

Weight 10 oz
Dimensions 8.75 × 2 × 2 in
Common-mode attenuation:

~40dB maximum
Frequency Range:

1-30 MHz
Maximum Power:

3kW I.C.A.S
Connectors:

PTFE/silver SO-239 connector with Gold pin
Dimesions:

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

1.1 lb (0.49 kg)

13 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 –

    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 –

    Has worked tremendously well for me.

  4. Robert Hall –

    My antenna is a app 250 foot long wire square and was having a high static noise problem. This product was put in line just before my tuner and it cut my noise level in half. I am able to clearly hear stations that were down in the mud/noise level and make clear contacts. Great product will recommend it to local hams

  5. Todd –

    I suggested this to a friend who had a lot of Common mode noise in his Alaskan shack. Like magic it was! Knocked down the noise quite a lot. I ended up buying one for one of my HF deployment kits. No sense in putting up with noise if you don’t have to.

    PS -heard about these things since the 70’s and figured it was just more radio mumbo-jumbo / too good to be true stuff. Nothing could be further from the truth. These work very well.

  6. Mark W. KD2KT –

    Works very well! I operate primarily on 40 meters and it has reduced my noise level from s8-9 to s7! Very pleased and a worthwhile investment.

  7. Paul Shaffer –

    Cuts back ground noise to a usable rate.

  8. Gerald Lemay –

    Excellent product. A bit on the expensive side but well worth it.

  9. Anonymous –

    Works great

  10. George Nestojko –

  11. Hal –

    Heavy duty. I have 3, one on a vertical, one on a dipole and one about 12 feet down the feed line from my 2K – EFHW. The do exactly what you would expect them to do. I have zero RF in the shack issues, but more importantly, you can really see the reduction in my noise floor. After the first one was installed, I knew I wanted them on all my antennas.

  12. mark w. –

  13. Joseph T. –

    Works great. Super effective RF choke

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