ARRL's General Q&A by ARRL

Author:ARRL
Language: eng
Format: mobi
Publisher: ARRL, the national association for Amateur Radio
Published: 2011-03-31T16:00:00+00:00

G4C08 Which of the following would reduce RF interference caused by common-mode current on an audio cable?

A. Placing a ferrite bead around the cable

B. Adding series capacitors to the conductors

C. Adding shunt inductors to the conductors

D. Adding an additional insulating jacket to the cable

(A) The best solution to many types of interference caused by proximity to an amateur station is to keep the RF signals from entering the equipment in the first place. If filters can be used, they are generally the most effective and least troublesome to install. The next approach is to prevent RF current flow by placing inductance or resistance in its path. This is done by forming the conductor carrying the RF current into an RF choke by winding it around or through a ferrite core. Ferrite beads and cores can also be placed on cables to prevent RF common-mode current from flowing on the outside of cable braids or shields (“common-mode” interference).

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