CMC-VHF-2K 110-180MHz


Common Mode Filter Choke / BALUN/ Noise Suppressor / RF Isolator

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

  • Multi-Zs™ Technology
  • Covers 110-180MHz
  • Power 2kW *ICAS
  • Common-mode attenuation: ~37dB
  • Choking Impedance >6,000 Ohms
SKU: CMC-VHF-2K Category: Tags: , ,


CMC-VHF-2K Common Mode Filter Choke / BALUN/  RF Isolator

This is the one and only Common Mode Filter Choke / BALUN for 110-180 MHz on the market. PATENT pending! It is the only product with over 6,000 Ohms of CMI (Common Mode Impedance) on 145MHz while maintaining a Resistive part of CMI for a wide range of frequency spectrum.

  • Multi-Zs™ Technology
  • Perfect to cure RFI/EMI problems.
  • Great noise suppressor!
  • Common-mode attenuation is up to ~37dB max. (measured in 50 Ohms systems)
Use it as BALUN for G5RV/ZS6BKJW, Dipoles etc.
Use it as BALUN for your VHF antenna

It is a cure for noisy locations, reduce the noise floor of your receiver by several S-units instantly.  Our CMC-VHF-2K has huge Resistive values of Common Mode Choking Impedance, see the chart for actual measurement data.

Unlike other companies, we do not claim unrealistic impedance values or frequency coverage. Most important, the value of CMC-VHF-2K 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.

Use it as Current BALUN for your High gain VHF Yagi antennas in order to maintain the best Front/Rear ratio as well as radiation pattern.

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

CMC-VHF-2K Features:

  • SO-239 PTFE (Teflon®)  which produces no impedance bump but the continuity of coaxial cable where the choke is inserted, 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 2kW in the VHF band.
  • The Enclosure is UV stable and could be used outside and as BALUN with an adapter connector.
  • CMC-VHFZmag-Impedance Magnitude     
  • Rs-Series Choking Resistance      
  • Xs-Series Choking Reactance

*ICAS = Intermittent Commercial and Amateur Service

Additional information

Common-mode attenuation:

~37dB maximum

Frequency Range:

110-180 MHz

Maximum Power:

2kW I.C.A.S


PTFE/silver SO-239 connector with Gold pin


(L x W ) (in / mm) 10.00 x 2 in. /25 x 51 mm


1.1 lb (0.49 kg)