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Common mode choke – current balun 1.5 kW for low band vertical antenna 160m 80m 40m
Choke – current balun or choke balun “isolates” common mode path along a feedline.
In transmitting antenna systems common mode currents harm antenna efficiency, lower gain, alter antenna pattern and increase local RFI.
In receiving systems increase noise floor, distorts audio, causes computer crashes, or might causes RF burns.
Good common mode choke or current balun have high common mode impedance.
The combination of proper grounding and high common mode impedance can reduce unwanted currents to unnoticeable values.
Rule-of-thumb suggests common mode impedance of 500 Ohm for 50 Ohm transmission lines. We suggest 1 kOhm or more.
Common mode chokes are necessary when using a bandpass filters in Multi-Multi station environment.
To prevent common mode currents flowing from one station cable to another station cable. Or feedline parallels another feedline.
Common mode choke must be located outside the station, before unwanted currents get near station wiring.
Measured common mode choke isolation with HP8753ES Network Analyzer:
1.8 MHz = 2 kOhm
3.65 MHz = 12 kOhm
7.1 MHz = 1.8 kOhm
Max. power = 1.5 kW
Used RG58 coaxial cable
Connectors SO239, PL259