Description
CMC-154-3K Common Mode Choke / Noise Suppressor / RF line Isolator
This is the one and only true Common Mode Choke / RF line Isolator for 1-54 MHz on the market. It is the only product with over 7000 Ohms of CMI on 50MHz while maintaining a Resistive part of CMI for more than 50MHz of the frequency spectrum, actually, it has the same values all the way up to 85MHz.
- Multi-Zs™ Technology
- Perfect to cure RFI/EMI problems.
- Great noise suppressor!
- Common-mode attenuation is up to 39dB max. (measured in 50 Ohms systems)
It is a cure for noisy locations, reduces 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 CMC154-3K 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-154K has huge Resistive values of Common Mode Choking Impedance from 1.8-54MHz, 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-154-3K 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-154-3K Features:
- SO-239 PTFE (Teflon®) Connectors which produce no impedance bump but a 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 only to 3kW because of the cable limit at the 50MHz.
- The enclosure is UV stable and could be used outside.
Use it as BALUN for YAGI, HEX beam, G5RV/ZS6BKW, Dipoles, etc.
Common Mode Impedance data Chart
| Frq.(MHz) | Zmag(Ohms) | Rs(Ohms) | Xs(Ohms) |
| 1.85 | 2500 | 1200 | 2200 |
| 3.7 | 3700 | 2600 | 2500 |
| 7 | 4800 | 3800 | 2800 |
| 10.1 | 5900 | 5250 | 2750 |
| 14 | 6500 | 6300 | 1700 |
| 18.1 | 6500 | 6500 | 700 |
| 21 | 6400 | 6400 | 360 |
| 24.9 | 6250 | 6250 | -18 |
| 28 | 6150 | 6150 | -140 |
| 50.1 | 7400 | 7300 | -1100 |
- Zmag-Impedance Magnitude
- Rs-Series Choking Resistance
- Xs-Series Choking Reactance
*ICAS = Intermittent Commercial and Amateur Service
