HF Low Band Common Mode Choke 1500W

Put this HF Low Band Common Mode Choke anywhere along the feed line to suppress common mode currents.

• In transmitting antenna systems common mode currents harm antenna efficiency, lower gain, alter antenna pattern, and increase local RFI.
• In receiving systems, it increases noise floor, distorts audio, causes computer crashes, or might cause RF burns.
• Good common mode choke or current balun have high common mode impedance.
• Proper grounding and high common mode impedance can reduce unwanted currents to unnoticeable values.
• Rule-of-thumb suggests a common mode impedance of 500 Ohm for 50 Ohm transmission lines. We suggest 1 kOhm or more.
• Common mode chokes are necessary when using bandpass filters in a Multi-Multi station environment. https://antennas-amplifiers.com/band-pass-filter/
• To prevent common mode currents from one station cable to another station cable. Or the feedline parallels another feedline.
• Common mode choke must be located outside of the station before unwanted currents get near station wiring.

Measured common mode impedance of HF Low Band Common Mode Choke

1.8 MHz = 2 kOhm
3.65 MHz = 12 kOhm
7.1 MHz = 1.8 kOhm
Max. power = 1.5 kW
Uses Teflon RG142 cable

Connectors SO239 + PL259