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
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) |
| 1.9 | 7300 | 4450 | 5700 |
| 3.8 | 9900 | 7500 | 6300 |
| 7.15 | 14000 | 13400 | 4200 |
| 10.1 | 14300 | 14200 | 1600 |
| 14 | 13800 | 13800 | -800 |
| 18.1 | 13500 | 13400 | -1600 |
| 21.2 | 13900 | 13700 | -2200 |
| 24.9 | 14500 | 14100 | -3300 |
| 28.5 | 15200 | 14400 | -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.