Description
CMF2000B: The CHOKE BALUN is a line isolator, that is a useful filter to limit or even eliminate the noise caused by nearby devices: televisions, radios, computers, etc.
It is also useful during the transmission periods to stop the return currents (CMC = Common Mode Currents) that flow on the external part of the coaxial cable.
The CHOKE BALUN can be placed under the antenna, regardless of the model, between a voltage balun and the coaxial cable, or between the antenna connector and the coaxial cable if there’s no balun.
It can also be placed in a radio station, between antenna cable and transceiver, to improve isolation. It can also be useful to break the “ground loops”, placing one between the radio and any amplifier.
The “Common Mode” filter acts on the currents that travel on the external part of the coaxial cable sheath during the transmission periods, something against which the “Low-Pass” filters are ineffective.
The union of a line / choke isolator and a low-pass filter (for example our HSP 35/600) can be successful for eliminating TVI phenomena.
It can also be very useful in mobile installation to avoid annoying R.F. feedback from antennas with grounding problems.
The Diamond CMF-2000B is a common mode filter that will prevent TVI and EMI CEM interference, caused by the transmission coaxial cable.
NOTE: This low pass filter eliminates harmonic frequencies outside the 1-54 Mhz band.
NOTE: WE RECOMMEND THE USE OF COAXIAL CABLES WITH DOUBLE SHIELDS TO MAXIMIZE RESULTS
Specifications:
Operational Frequency: 1-54 MHz
Max. power rating: 2kW p.e.p. (SSB)
Common mode attenuation: More than -30dB (max)
Insertion loss: Less than 0.3dB
VSWR: Less than 1.2
Impedance: 50 Ohm
Connector: MJ (for PL-259)
Length: 380 mm (including connector)
Weight: 650 g
